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Macromolecular research 14건

  1. [국내논문]   Blends of Silicone Rubber and Liquid Crystalline Polymer   피인용횟수: 1

    Shivakumar E. (Materials Science Center ) , Das C. K. (Materials Science Center ) , Pandey K. N. (DMSRDE ) , Alam S. (DMSRDE ) , N.Mathur G. (DMSRDE)
    Macromolecular research v.13 no.2 ,pp. 81 - 87 , 2005 , 1598-5032 ,

    초록

    Blends of silicone rubber (VMQ) and liquid crystalline polymer (LCP) were prepared by the melt mixing technique. Mechanical, XRD, thermal and dynamic mechanical investigations are reported for the pure silicone rubber and blends. The mechanical properties, viz. the tensile strength, tear strength and elongation at break, of the silicone rubber decreased with the addition of LCP. The SEM study on the tensile fractured surface of the blends revealed that they had a two phase structure, and that the failure was mainly due to fiber pull out, which suggests that the VMQ and LCP are incompatible in all of the proportions examined in this study. However, the FTIR study shows that there was a partial interaction between the VMQ and LCP, but which may not be sufficient to grip the fibrils under the applied load. In the XRD analysis, it was observed that the crystalline structure of the silicone rubber deteriorated in the presence of LCP. The DMA study suggested that the storage modulus of the silicone rubber was improved with the addition of LCP, due to the high modulus of the LCP phase. The thermal stability of the silicone rubber was greatly reduced by the addition of LCP, due to the latter having a thermal stability lower than that of silicone rubber.

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  2. [국내논문]   Transesterification and Compatibilization in the Blends of Bisphenol-A Polycarbonate and Poly(trimethylene terephthalate)   피인용횟수: 2

    Na Sang-Kuwon (Department of Polymer Science and Engineering, Sunchon National University ) , Kong Byeong-Gi (Department of Polymer Science and Engineering, Sunchon National University ) , Choi Changyong (Department of Polymer Science and Engineering, Sunchon National University ) , Jang Mi-Kyeong (Department of Polymer Science and Engineering, Sunchon National University ) , Nah Jae-Woon (Department of Polymer Science and Engineering, Sunchon National University ) , Kim Jung-Gyu (Chemical and Polymer Science & Engineering, Chosun University ) , Jo Byung-Wook (Chemical and Polymer Science & Engineering, Chosun University)
    Macromolecular research v.13 no.2 ,pp. 88 - 95 , 2005 , 1598-5032 ,

    초록

    Melt blending of Bisphenol A polycarbonate (PC) and poly(trimethylene terephthalate) (PTT) was carried out over the entire composition range. The mixing time was varied up to 90 min. The resulting samples were analyzed by FT-IR, DSC, XRD, DMTA, $^{1}H NMR$ , and SEM. The process of transesterification between the two polymers and their resulting compatibilization were observed. The behaviors of the PTT-rich and PC-rich blends were different and an equilibrium was found to exist. Peculiar behavior, which was different from that of the PTT-rich and PC-rich blends, was exhibited by the 50/50 (PTT/PC) blend.

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  3. [국내논문]   Humidity Sensitivity of Hybrid Polyelectrolytes Prepared by the Sol-Gel Process   피인용횟수: 7

    Lee Chil-Won (Department of Chemistry, Dankook University ) , Park Hyung-Seok (Department of Chemistry, Dankook University ) , Kim Jong-Gyu (Department of Chemistry, Dankook University ) , Gong Myoung-Seon (Department of Chemistry, Dankook University)
    Macromolecular research v.13 no.2 ,pp. 96 - 101 , 2005 , 1598-5032 ,

    초록

    Thin-film humidity sensors were prepared using inorganic/organic hybrid polyelectrolytes, which were prepared from the sol-gel reaction of copolymers of [2-(methacryloyloxy)ethyl]dimethylpropylammonium bromide (MEPAB), n-butyl methacrylate (BMA), and 3-(trimethoxysilyl)propyl methacrylate (TSPM) with tetraethyl ortho-silicate (TEOS). The humidity-sensitive polyelectrolytes were composed of the copolymers having the following mole ratios of MEPAB, BMA, and TSPM: 60/30/10, 55/30/15, and 50/30/20. We found that the impedance varied with the content of MEPAB or TEOS; it ranged from $10^{7} to 10^{3}\Omega$ between 20 and $95\%$ relative humidity, which is the range required for a humidity sensor operating at ambient humidity. In addition we investigated a number of characteristics of these humidity sensors, such as their hysteresis, response time, temperature dependence, frequency dependence, water durability, and long-term stability.

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  4. [국내논문]   Preparation of Poly(methyl methacrylate)/Na-MMT Nanocomposites via in-Situ Polymerization with Macroazoinitiator  

    Jeong Han Mo (Research Center for Machine Parts and Materials Processing, Department of Chemistry, University of Ulsan ) , Ahn Young Tae (Research Center for Machine Parts and Materials Processing, Department of Chemistry, University of Ulsan)
    Macromolecular research v.13 no.2 ,pp. 102 - 106 , 2005 , 1598-5032 ,

    초록

    Poly(methyl methacrylate) (PMMA)/sodium montmorillonite (Na-MMT) nanocomposites were prepared with a novel method utilizing a macroazoinitiator (MAI). To induce the intergallery polymerization of methyl methacrylate (MMA), the MAI containing a po1y(ethylene glycol) (PEG) segment was intercalated between the lamellae of Na-MMT and swelled with water to enhance the diffusion of MMA into the gallery. The structure of the nanocomposite was examined using X-ray diffraction and transmission electron microscopy, and the thermal properties were examined using differential scanning calorimetry and thermogravimetry. The PMMA/Na-MMT nanocomposite prepared by intergallery polymerization showed a distinct enhancement of its thermal properties; an approximately $30^{\circ}C$ increase in its glass transition temperature and an $80\sim100^{\circ}C$ increase in its thermal decomposition temperature for a $10\%$ weight loss.

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  5. [국내논문]   A Simulation Method for Modeling the Morphology and Characteristics of Electrospun Polymeric Nanowebs  

    Kim Hyungsup (Department of Textile Engineering & NITRl, Konkuk University ) , Kim Dae-Woong (Department of Textile Engineering & NITRl, Konkuk University ) , Seo Moon Hwo (Department of Textile Engineering & NITRl, Konkuk University ) , Cho Kwang Soo (Department of Polymer Science, Kyungpook National University ) , Haw Jung Rim (Department of Material Science and Engineering, Konkuk University)
    Macromolecular research v.13 no.2 ,pp. 107 - 113 , 2005 , 1598-5032 ,

    초록

    We developed an algorithm to simulate the generation of virtual nanowebs using the Monte Carlo method. To evaluate the pore size of the simulated multi-layered nanoweb, an estimation algorithm was developed using a ghost particle having zero volume and mass. The penetration time of the ghost particle through the virtual nanoweb was dependent on the pore size. By using iterative ghost particle penetrations, we obtained reliable data for the evaluation of the pore size and distribution of the virtual nanowebs. The penetration time increased with increasing number of layers and area ratio, whereas it decreased with increasing fiber diameter. Dimensional analysis showed that the penetration time can be expressed as a function of the fiber diameter, area ratio and number of layers.

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  6. [국내논문]   Synthesis and Characterization of Novel Light-Emitting Copolymers with Electron-Withdrawing Substituents   피인용횟수: 3

    진성호 (Department of Chemistry Education and Center for Plastic Information System, Pusan National University ) , 구대성 (Department of Chemistry Education and Center for Plastic Information System, Pusan National University ) , 황찬구 (Department of Chemistry Education and Center for Plastic Information System, Pusan National University ) , 도정윤 (Department of Chemistry Education and Center for Plastic Information System, Pusan National University ) , 김영인 (Department of Chemistry Education and Center for Plastic Information System, Pusan National University ) , 갈영순 (Polymer Chemsitry Lab., Kyungil University ) , 이재욱 (Department of Chemistry, Dong-A University ;) , 황진택
    Macromolecular research v.13 no.2 ,pp. 114 - 119 , 2005 , 1598-5032 ,

    초록

    We synthesized two new series of alternating copolymers, poly[bis(2-(4-phenylenevinylene)-2-cyanoethenyl)-9,9-dihexyl-9H-fluoren-2,7-yl-alt-1,4-phenylene](Polymer-I)and poly[bis(2-(4-phenylenevinylene)-2­cyanoethenyl)-9,9-dihexyl-9H-fluoren-2,7-yl-alt-2,7-(9,9-dihexylfluorene)](Polymer-II), via the Suzuki coupling reaction, for use in light-emitting diodes (LEDs). Defect-free uniformly thin films of these polymers were found to be easily formed on indium-tin oxide (ITO) coated glass substrates. Multi-layer LEDs with ITO/PEDOT/Polymer/ LiF/Al configurations with or without an $Alq_3$ electron transport layer were fabricated with these polymers. The maximum EL emissions of Polymer-I and Polymer-II with an $Alq_3/LiF/Al$ cathode were observed at 516 and 533 nm, respectively. The maximum brightness and external luminance efficiency of the devices fabricated with the EL polymers were found to be $411 cd/m^2$ and 0.16 cd/A, respectively.

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  7. [국내논문]   Surface and Chemical Properties of Surface-Modified UHMWPE Powder and Mechanical and Thermal Properties of Its Impregnated PMMA Bone Cement V. Effect of Silane Coupling Agent on the Surface Modification of UHMWPE Powder  

    Yang Dae Hyeok (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Yoon Goan Hee (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Shin Gyun Jeong (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Kim Soon Hee (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Rhee John M. (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Khang Gilson (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Lee Hai Bang (Nano-biomaterials Laboratory, Korea Research Institute of Chemical Technology)
    Macromolecular research v.13 no.2 ,pp. 120 - 127 , 2005 , 1598-5032 ,

    초록

    Conventional poly(methyl methacrylate) (PMMA) bone cement has been widely used as an useful biopolymeric material to fix bone using artificial prostheses. However, many patients had to be reoperated, due to the poor mechanical and thermal properties of conventional PMMA bone cement, which are derived from the presence of unreacted MMA liquid, the shrinkage and bubble formation that occur during the curing process of the bone cement, and the high curing temperature ( $above 100^{\circ}C$ ) which has to be used. In the present study, a composite PMMA bone cement was prepared by impregnating conventional PMMA bone cement with ultra high molecular weight polyethylene (UHMWPE) powder, in order to improve its mechanical and thermal properties. The UHMWPE powder has poor adhesion with other biopolymeric materials due to the inertness of the powder surface. Therefore, the surface of the UHMWPE powder was modified with two kinds of silane coupling agent containing amino groups (3-amino propyltriethoxysilane ( $TSL 8331^{R}$ ) and N-(2-aminoethyl)-3-(amino propyltrimethoxysilane) ( $TSL 8340^{R}$ )), in order to improve its bonding strength with the conventional PMMA bone cement. The tensile strengths of the composite PMMA bone cements containing $3 wt\%$ of the UHMWPE powder surface-modified with various ratios of $TSL 8331^{R}$ and $TSL 8340^{R}$ were similar or a little higher than that of the conventional PMMA bone cement. However, no significant difference in the tensile strengths between the conventional PMMA bone cement and the composite PMMA bone cements could be found. However, the curing temperatures of the composite PMMA bone cements were significantly decreased.

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  8. [국내논문]   Synthesis and Properties of Novel Flame Retardant Poly(butylene terephthalate)   피인용횟수: 1

    Park Jong Min (School of Applied Chemistry and Chemical Engineering, Sungkyunkwan University, KOLON Central Research Park ) , Park Yun Heum (School of Applied Chemistry and Chemical Engineering, Sungkyunkwan University, Hyperstructured Organic Research Center)
    Macromolecular research v.13 no.2 ,pp. 128 - 134 , 2005 , 1598-5032 ,

    초록

    The phosphorus comonomer [(6-oxido-6H-dibenz oxaphosphorin-6-yl)methyl]-methyl butane-dioate (DOP-MBDA) was synthesized through the addition reaction of dimethyl itaconate (DMI) with 9,10-dihydro­9-oxa-10-phosphaphenan threne-10-oxide (DOP). A series of novel flame retardant poly(butylene terephthalate)s (PBTs) containing different amounts of phosphorus were prepared using DOP-MBDA as a comonomer. These novel polymers were characterized by $^{1}H-NMR$ , IR, and differential scanning calorimetry (DSC). The novel phosphorus­containing poly(butylene terephthalate)s, referred to as FR-PBTs, exhibited interesting thermal and mechanical behavior, as well as superior flame retardancy. These properties are attributed to the effect of incorporating the rigid structure of DOP-MBDA and the pendant phosphorus group into the poly(butylene terephthalate) (PBT) homopolymer. The UL 94-V2 rating could be achieved with this novel flame retardant PBT, which has a phosphorus content as low as $0.5 wt\%$ , and the FR-PBTs emitted less fumes and toxic gases than the PBT homopolymer.

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  9. [국내논문]   Aging Effect of Poly(vinyl alcohol) Membranes Crosslinked with Poly(acrylic acid-co-maleic acid)   피인용횟수: 2

    Rhim Ji Won (Department of Chemical Engineering, Hannam University ) , Hwang Ho Sang (Department of Chemical Engineering, Hannam University ) , Kim Dae Sik (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University ) , Park Ho Bum (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University ) , Lee Chang Hyun (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University ) , Lee Young Moo (National Research Laboratory for Membranes, School of Chemical Engineering, College of Engineering, Hanyang University ) , Moon Go Young (CRD, Research Park, LG Chem ) , Nam Sang Yong (Department of Polymer Science and Engineering, Engineering Research Institute, Gyeongsang National University)
    Macromolecular research v.13 no.2 ,pp. 135 - 140 , 2005 , 1598-5032 ,

    초록

    Poly(vinyl alcohol) (PVA) membranes crosslinked with poly(acrylic acid-co-maleic acid) (PAM) were prepared to investigate the effect of aging on their morphology by swelling them for up to 7 days. PAM was used both as a crosslinking agent and as a donor of the hydrophilic-COOH group. A $30 wt\%$ weight loss of the dry membrane was observed in the swelling test after 6 days. The surface of the membrane was dramatically changed after the swelling test. The surface roughness of the PVA/PAM membrane was increased, as determined by atomic force microscopy (AFM). The swelling loosened the polymer structure, due to the release of the unreacted polymer and the decomposition of the ester bond, thereby resulting in an increase in the free volume capable of containing water molecules. The water molecules present in the form of free water were determined by differential scanning calorimetry (DSC). The fraction of free water increased with increasing swelling time. The swelling of the membrane may provide space for the transport of protons and increase the mobility of the protonic charge carriers. The proton conductivity of the membranes measured at T= 30 and $50^{\circ}C$ was in the range of $10^{-3} to 10^{-2} S/cm$ , and slightly increased with increasing swelling time and temperature.

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  10. [국내논문]   Synthesis and Properties of Calix[4]crown-6 Functionalized Polymers  

    Kim Su-Han (Department of Chemistry, Dankook University ) , Lee Chil-Won (Department of Chemistry, Dankook University ) , Jeon Young-Min (Department of Chemistry, Dankook University ) , Gong Myoung-Seon (Department of Chemistry, Dankook University)
    Macromolecular research v.13 no.2 ,pp. 141 - 146 , 2005 , 1598-5032 ,

    초록

    Calix[4]crown-6-2,4-bis(4-aminobutyl ether), which has a crown-6 moiety at the 1,3-position and amino function at the 2,4-position, was prepared as an intermediate for the subsequent synthesis of calix[4]crown-6-containing polyamide and polyimide using adipoyl chloride and 1,2,4,5-benzenetetracarboxylic dianhydride. The chemical structures were characterized by IR, $^{1}H NMR$ spectroscopy and elemental analysis, and some of their physical properties, including their thermal behavior, were examined. The ion binding characteristics of the monomer and polymers for alkali metal and alkali earth metal ions were measured by liquid-liquid extraction from the aqueous phase into the organic phase. It has been observed that polyamide has a high binding ability towards various metal cations as compared to polyimide, which showed cesium ion selectivity.

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