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Control of degradation rate of biodegradable polymers (The application of corona discharge treatments)

生物降解聚合物降解速率的控制（电晕放电处理的应用）

基本信息

批准号：
12680578
负责人：
OSAWA Satoshi
金额：
$ 1.98万
依托单位：
Kanazawa Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

项目摘要

Effects of corona discharge treatment on the degradation rate of poly (L-lactic acid) (PLA) and Poly(ε-caprolactone) (PCL) and Poly(butylenesuccinate・adipate) (PBSA) have been investigated The treatment introduced oxygen containing functional groups onto the polymer surfaces The contact angles of these polymers decreased by 30〜60゜ indicating an increase in hydrophilicity on the polymer surfaces The composting degradation tests were carred out for both treated and untreated PLA, PCL and PBSA The treatment depressed the degradation of PLA, while it promoted the degradation of PCL and PBSAThe affinity between microorganisms (general bacteria, actinomycetes, fungi) and the polymer surfaces have also been estimated by a film-contacting method The results showed that the treatment decreased the affinity for PLA due to the production of lactic acid having antibacterial activity by the corona discharge treatment On the contrary, the corona treatment increased the affinity for PCL ~and PBSA Especially, Aspergillus sp rapidly adsorbed to the treated surfaces and has a significant degradation activity for PCL and PBSA The adsorption of lipase (from Aspergillus sp) onto the polymer surface was also increasedTo depress the degradation for several weeks, natural antibacterial substance, which was extracted from Japanese horseradish, was oated on the PCL and PBSA films The sinigrin (extracted from Japanese horse-radish) coated PCL and PBSA films were successfully depressed the degradation for 3 weeks, and then degraded immediately The PLA/starch blends coated with pure PLA and PCL were also made by a conventional coating method to control the degradation rate The degradations of the coated blends were depressed for 2〜4 weeks, after that they degraded immediately

电晕处理对聚乙烯降解速率的影响（L-乳酸）（PLA）和聚（ε-己内酯）（PCL）和聚（丁二酸丁二醇酯·己二酸丁二醇酯）（PBSA）结果表明，该处理方法在聚合物表面引入了含氧官能团，使聚合物表面的接触角降低了30 ~ 60 °，表明聚合物表面的亲水性增加。处理抑制了PLA的降解，但促进了PCL和PBSA的降解。（一般细菌，放线菌，真菌）和聚合物表面也已经通过膜-结果表明，处理降低了对PLA的亲和力，这是由于电晕产生了具有抗菌活性的乳酸放电处理则相反，电晕处理增加了对PCL ~-和PBSA的亲和性，特别是曲霉菌能迅速吸附在处理过的表面上，对PCL和PBSA有明显的降解活性。为了抑制降解数周，从日本辣根中提取的天然抗菌物质，在PCL和PBSA膜上涂布。（从日本辣根中提取）涂覆的PCL和PBSA膜成功地抑制了降解3周，然后立即降解。用纯PLA和PCL涂覆的PLA/淀粉共混物也通过常规涂覆方法制备以控制降解速率。涂覆共混物的降解被抑制2 - 4周，在那之后，