Journal•ISSN: 0379-153X
Polymer-korea
The Polymer Society of Korea
About: Polymer-korea is an academic journal published by The Polymer Society of Korea. The journal publishes majorly in the area(s): Chemistry & Polymer. It has an ISSN identifier of 0379-153X. Over the lifetime, 1623 publications have been published receiving 3529 citations. The journal is also known as: Polymer Korea & Polymer (Korea).
Topics: Chemistry, Polymer, Copolymer, Polymerization, Epoxy
Papers published on a yearly basis
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TL;DR: Bacterial cellulose as discussed by the authors : Cluconacetobacter xylinus (CLUconacetolbactersp.xylinus) is a type of cellulose.
Abstract: Bacterial cellulose는 초산균인 Cluconacetobacter xylinus에 의해 생산되며. 배양 배지의 표면에 나노섬유상의 막을 형성한다. 본 연구에서는 배지의 조성에서 탄소원을 달리하여 생산한 bacterial cellulose의 결정화도 점도 모폴로지와 역학적 물성을 살펴보았다. Cluconacetolbactersp. V6 균은 세 종류의 배양 배지에서 정치 상태로 배양되었다. 배양 배지로는 표준 Hestrin-Schramm 배지와 탄소원으로 glycerol 또는 molasses를 첨가한 개젤 배지가 각각 시용되었다. 세포 성장과 셀룰로오스 수율은 molasses 배지와 glycerol 배지에서 증가하였다. Glycerol 배지를 사용한 배양은 결정화도와 고유점도, 파단응력과 같은 셀룰로오스의 물성을 향상시켰으나 molasses 배지를 사용한 배양은 셀룰로오스의 결정화도 미결정의 크기, 고유점도를 감소시켰다 요약하면, molasses 배지에서 셀룰로오스의 수율은 현저히 향상되었으나, 낮은 구조적 물성을 가졌다.
222 citations
TL;DR: In this paper, two types of polymers were tested; poly(ethylene terephthalate) (PET) as a synthetic example and poly(lactic acid) (PLA) as natural polymer.
Abstract: Two types of polymers were tested in this study; poly(ethylene terephthalate) (PET) as a synthetic example and poly(lactic acid) (PLA) as a natural polymer. DSC analyses showed that the use of nanofiller increased the degree of crystallinity () of both PET and PLA polymers, but the effect was more noticeable on PET nanocomposites. The crystallization of PLA and PET nanocomposites occurred at higher temperatures in comparison to neat polymers. According to dynamic mechanical-thermal analysis (DMTA), the damping factor of PET/ nanoparticles decreased compared to the neat matrix, but for PLA nanocomposites the opposite trend was observed. Results of the mechanical test showed that for both PET and PLA nanocomposites, the most successful toughening effect was observed at 3 wt% loading of nanoparticles. SEM micrographs revealed uniform distribution of nanoparticles at 1 and 3 wt% loading levels. The results of WAXD spectra explained that the polymorphs of PLA and PET was not affected by nanoparticles. UV-visible spectra showed that nanocomposite films had high ultraviolet shielding compared to neat polymer, but there was significant reduction in transparency.
26 citations
TL;DR: In this article, three different types of additives, thiokol, epoxidized natural rubber (ENR) and epoxedized linseed oil (ELO), were dispersed in an epoxy matrix before being used in glass fiber composites, and their effects on the mechanical and dielectric properties of epoxy resin and glass fiber reinforced epoxy composites (GF/EP) were examined.
Abstract: Three different types of additives, thiokol, epoxidized natural rubber (ENR) and epoxidized linseed oil (ELO), were dispersed in an epoxy matrix before being used in glass fiber (GF) composites, and their effects on the mechanical and dielectric properties of epoxy resin and glass fiber reinforced epoxy composites (GF/EP) were examined. The addition of each of 7 phr ENR, 9 phr ELO and 5 phr thiokol into the epoxy resin increased the fracture toughness significantly by 56.9, 43.1, and 80.0%, respectively, compared to the unmodified resin. The mode I interlaminar fracture toughness of the GF/EP at propagation was also improved by 26.9, 18.3 and 32.7% when each of 7 phr ENR, 9 phr ELO, and 5 phr thiokol, respectively, was dispersed in the epoxy matrix. Scanning electron microscopy showed that the additives reduced crack growth in the GF/EP, whereas their dielectric measurements showed that all these additives had no additional effect on the real permittivity and loss factor of the GF/EP.
24 citations
TL;DR: In this article, the BDDE (1,4-butanediol diglycidyl ether) was used to extract the hyaluronic acid (HA) from the diglycitric acid.
Abstract: 분자량이 다른 세종류 히알루론산(HA)에 1,4-butanediol diglycidyl ether(BDDE)가 가교된 hyaluronic acid(HA)를 첨가하여 하이드로겔을 제조하고 HA 분자량에 따른 팽윤도와 탄성계수의 효과를 조사하였다. 최종 투석 후 잔류 BDDE 양은 0.5 ppm 이하이었다. 비가교된 분자량이 큰 HA에서 최대 팽윤도가 관찰되었다. 팽윤도는 비가교 HA 양과 가교도에 각각 비례와 반비례하였다. 1.0 w/v% BDDE 가교 HA와 HA(1368 kDa)를 혼합한 monophasic 하이드로젤의 탄성계수는 152~325 ㎩이었다. 15% 가교 HA(687 kDa)과 85% HA(1368 kDa)로 구성된 biphasic 하이드로젤의 탄성계수는 178 Pa이었다.
19 citations
Journal Article•
TL;DR: In this article, the phase change material (PCM) was applied to polystyrene (PS) particles and the morphology and particle features were analyzed by scanning electron microscope and particle size analyzer, respectively.
Abstract: Polystyrene (PS) particles containing the phase change material (PCM) were synthesized by miniemulsion polymerization. The polymer particles prepared with different parameters were investigated in terms of average particle size, particle distribution, and latent heat storage of encapsulated paraffin wax (PW) as PCM. The morphology and particle features of PS particles were analyzed by scanning electron microscope and particle size analyzer, respectively. As a result, the diameters of PS particles were adjusted with manufacturing conditions. The stable and spherical PS particles of nanosize were obtained by miniemulsion polymerization, which could be attributed to the prevention of Ostwald ripening by cosurfactant. Thermal properties of PS particle containing PCM were studied by differential scanning calorimetry. From DSC freeze-thaw cycle, PCM coated with PS exhibited the thermal energy storage and release behaviors, and the latent heat was found to be a maximum 145 J/g. It was noted that PS particles containing PCM showed a good potential as a thermal energy storage medium.
19 citations