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Characterization of photo-oxidative degradation process of polyolefins containing oxo-biodegradable additives
Polymer ( IF 4.6 ) Pub Date : 2022-11-04 , DOI: 10.1016/j.polymer.2022.125455
Adchara Padermshoke, Tomoko Kajiwara, Yingjun An, Mamiko Takigawa, Toan Van Nguyen, Hiroyasu Masunaga, Yutaka Kobayashi, Hiroshi Ito, Sono Sasaki, Atsushi Takahara

The effects of oxo-biodegradable additives on the photo-oxidation of four types of polyolefin polymers, namely high-density polyethylene (HDPE), low-density PE (LDPE), linear low-density PE (LLDPE), and isotactic polypropylene (itPP) were investigated. Scanning electron microscopy, infrared spectroscopy, differential scanning calorimetry, and wide- and small-angle X-ray scattering were employed to gain insights into the chemical and structural modifications induced by the degradation process. The photo-oxidation preferentially occurred at the sample surface and was favored in the amorphous region of the polymers. The carbonyl index calculated for the neat and additive-containing samples suggested that the additives promoted the photo-oxidative degradation, particularly of the PE polymers, which are intrinsically resistant to oxidation, without altering their degradation pathways. The overall degradation rate of the additive-containing polymers was in the order of itPP > LDPE > LLDPE > HDPE.



中文翻译:

含氧生物降解添加剂的聚烯烃光氧化降解过程表征

含氧生物降解添加剂对高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE)和全同立构聚丙烯四种聚烯烃聚合物光氧化的影响(itPP) 进行了调查。扫描电子显微镜、红外光谱、差示扫描量热法以及广角和小角 X 射线散射被用来深入了解降解过程引起的化学和结构修饰。光氧化优先发生在样品表面,并有利于聚合物的非晶态区域。对纯样品和含有添加剂的样品计算的羰基指数表明,添加剂促进了光氧化降解,特别是 PE 聚合物的光氧化降解,它们本质上是抗氧化的,而不会改变它们的降解途径。含添加剂聚合物的总降解速率为PP > LDPE > LLDPE > HDPE。

更新日期:2022-11-08
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