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首页> 外文期刊>Journal of Polymers and the Environment >Fouling and Degradation of Polycarbonate in Seawater: Field and Lab Studies
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Fouling and Degradation of Polycarbonate in Seawater: Field and Lab Studies

机译：海水中聚碳酸酯的结垢和降解：现场和实验室研究

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摘要

Biofouling and ensuing microbial mediated degradation of Bisphenol A polycarbonate was studied by immersing the samples in sea water of Bay of Bengal (Chennai, India) for 3 months and also under controlled laboratory conditions with marine mixed microbial con-sortia for 12 months. A 9% weight loss in the sample was observed after 1 year of incubation under in vitro laboratory conditions. A 5% reduction in number average molecular weight and an additional oligomer with a molecular weight of 930 was observed in the same sample. Contact angle decreased by 11 % indicating an increase in the surface hydrophilicity. The specific heat decreased by 44% and glass transition temperature decreased by 3 ℃ with respect to the control indicating chain scission. Formation of new hydroxyl groups and cleavage of carbonate bonds in polycarbonate suggested biodegradation. About 9 ug mL~(-1) of Bisphenol A, a monomer of polycarbonate, as well as its oxidized products were detected in the supernatant. The nature of degradation in field and in vitro was different. It was predominantly oxidation in the former and hydrolysis in the later environment. A strain exhibiting hydrolase activity was isolated at the end of the 12 months from the in vitro mixed consortia and was identified, based on biochemical and 16S rDNA tests, as Pseudomonas sp. BP2 (GenBank accession no. EU920674).
机译：通过将样品在孟加拉湾（印度钦奈）的海水中浸泡3个月，并在受控的实验室条件下与海洋微生物混合体一起浸泡12个月，研究了生物污染和随后的微生物介导的双酚A聚碳酸酯降解。在体外实验室条件下孵育1年后，观察到样品重量减轻了9％。在同一样品中观察到数均分子量降低了5％，分子量为930的其他低聚物减少了。接触角降低11％，表明表面亲水性增加。与对照相比，比热降低了44％，玻璃化转变温度降低了3℃，表明链断裂。聚碳酸酯中新羟基的形成和碳酸酯键的断裂表明生物降解。在上清液中检测到约9 ug mL〜（-1）的聚碳酸酯单体双酚A及其氧化产物。现场和体外降解的性质是不同的。前者主要是氧化，后者则是水解。在12个月末从体外混合菌群中分离出具有水解酶活性的菌株，并根据生化和16S rDNA测试鉴定为假单胞菌sp。 BP2（GenBank登录号EU920674）。

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