Papers by Keyword: Polyethylene Teraphtalate (PET)

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Authors: Jie Tao, Xiang Dong, Tao Wang, Yi Hua Cui
Abstract: In order to improve the crystallization properties of the polyethylene terephthalate (PET), nano-zinc oxide (nano-ZnO)/PET and nano-ZnO/polyethylene glycol (PEG)/PET composites were successfully synthesized by in-situ polymerization method in this work. The experimental results indicated that nano particles can accelerate the crystallization of the PET which was demonstrated by increase in the intensities of the XRD peaks. PEG and PET form copolymer in composites, leading to the improvement of the flexibility of the molecule chain. Meanwhile, PEG was able to encapsulate the nano particles to make them have both good compatibility to matrix and uniform dispersion in the composites. Therefore, the crystallization rate and crystallization capability of nano-ZnO/PEG/PET composites were reasonably raised.
Authors: Ryoichi Suzuki, Yoshinori Kobayashi, Tomohisa Mikado, Hideaki Ohgaki, M. Chiwaki, T. Yamazaki, T. Tomimasu
Authors: Jian Xin Li, Jin Wang, Peng Li, Ya Jun Weng, Ling Ren, Xue Ling Fei, Hong Sun, Nan Huang
Abstract: of artificial blood catheters. This paper describes the immobilization of chitosan and heparin molecules on polyethylene terephthalate (PET) films by ozonization. The concentration of peroxide groups (-OOH) was 1.72 × 10-7 mol/cm2 on the PET surface oxidized by ozonization. The results of X-ray photoelectron spectroscopy (XPS) indicate that chains of chitosan and heparin were successfully immobilized on the PET films. The static contact angle(STA) of water decreases from 83.5° to 68.3° by immobilization of chitosan and heparin, which means that the hydrophilic properties of the modified PET is improved. The antithrombogenic property of PET surface was evaluated by a platelet-rich plasma (PRP) adhesion test. The results indicate that the number of platelet adhered on the modified-PET surface incubated with PRP for 240 min decreased significantly and platelets did not aggregate and distort.
Authors: G. Mayer, N. Blanchemain, C. Dupas-Bruzek, M. Traisnel, D. Derozier, L.D. Laude, H.F. Hildebrand
Abstract: LASER Excimer irradiation can modify surface properties for biocompatibility improvement of a medical device. The PETs from 3 different origins were used in this study. The samples have been irradiated by excimer LASER with 10 different energies. The surface profile, the surface energy and the materials crystallinity have been assessed. Biological characterizations were made with human embryonic epithelial cells L132: proliferation, vitality, viability, adhesion with the p-NPP, and morphology. - The profile measurements allowed to establish the ablation threshold, which was 36 mJ/cm². The surface hydrophilic state increased reciprocally with the irradiation intensity. The gain is 13 %. The irradiated and non-irradiated product has identical cristallinity. PET was shown not to be toxic for L132 cells. Cell proliferation and cell vitality showed dose-dependant increases reciprocal to the irradiation energy (from 88 to 138% with respect to control). The correlation was highly significant (R² = 0,8). SEM micrographs show that the cells are better spread on the surface of irradiated PET than on untreated PET.
Authors: S.Y. Wang, B.G. Nong, Tian Bao Chang, H.D. Wang
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