Surface oxidation of Polyhydroxyalkanoate films with different molecular structure via photo-activated chlorine dioxide radical and comparison of the influence on the properties
Surface oxidation of Polyhydroxyalkanoate films with different molecular structure via photo-activated chlorine dioxide radical and comparison of the influence on the properties
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光活化二氧化氯自由基对不同分子结构聚羟基脂肪酸酯薄膜的表面氧化及其性能影响比较
DOI：
10.1016/j.polymdegradstab.2023.110391
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发表时间：
2023
影响因子：
5.9
通讯作者：
Iwata Tadahisa
中科院分区：
文献类型：
--
作者：
Tateiwa Jobu;Hsu Yu-I;Uyama Hiroshi;Kasuya Ken-ichi;Iwata Tadahisa
聚羟基链烷酸酯 (PHA) 是生物可降解塑料的新型候选材料，疏水性表面经过改性，可提高其染色性和对其他材料的附着力。本研究通过光活化二氧化氯自由基对四种不同分子结构的PHA薄膜进行表面氧化，以研究引入的官能团数量是否发生变化。还研究了氧化是否改变了海水中的机械性能、结晶度、酶降解性和生物降解性。发现具有不含侧链的单体单元的聚合物中官能团的数量减少，表明氧化反应活性受到侧链的存在的影响。没有观察到机械性能和结晶度的显着变化。一些氧化的PHA膜的酶降解性显着降低，因为氧化导致分子结构发生变化，与PHA解聚酶催化结构域的底物特异性不匹配。在使用海水的生物降解试验中，氧化膜的初始生物降解率略有降低，表明氧化可能影响环境中微生物的生物降解。
Polyhydroxyalkanoates (PHAs) are novel candidates for biodegradable plastics, and hydrophobic surfaces have been modified to improve their dyeability and adhesion to other materials. In this study, surface oxidation by photoactivated chlorine dioxide radicals was carried out on four types of PHA films with different molecular structures to investigate whether the number of introduced functional groups changes. Whether the mechanical properties, crystallinity, enzymatic degradability, and biodegradability in seawater were changed by oxidation was also investigated. It was found that the number of functional groups decreased in the polymer having monomer units without side chains, indicating that the reactivity of the oxidation is affected by the presence of the side chain. No significant changes in mechanical properties and crystallinity were observed. The enzymatic degradability of some of the oxidized PHA films was significantly reduced because it did not match the substrate specificity of the catalytic domain of a PHA depolymerase due to changes in the molecular structure caused by oxidation. In a biodegradation test using seawater, the initial biodegradation rate of the oxidized films was slightly reduced, suggesting that the oxidation may affect the biodegradation of microorganisms in the environment.
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光活化二氧化氯自由基对聚合物表面的氧化
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
中野晟志;橋口翔;田邉洋一;東村秀之;Haruyasu Asahara
通讯作者：
Haruyasu Asahara
影响因子：
4.9
作者：
Ohkubo, Kei;Asahara, Haruyasu;Inoue, Tsuyoshi
通讯作者：
Inoue, Tsuyoshi
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
M. Mohammad
通讯作者：
M. Mohammad
通过 X 射线衍射测量拉伸聚对苯二甲酸乙二醇酯纤维的结晶度
DOI：
10.1088/0508-3443/11/9/515
发表时间：
1960
期刊：
British Journal of Applied Physics
影响因子：
--
作者：
G. Farrow;D. Preston
通讯作者：
D. Preston
柠檬假单胞菌聚（3-羟基戊酸）解聚酶的纯化及性质
影响因子：
5
作者：
B. Müller;D. Jendrossek
通讯作者：
D. Jendrossek