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

研究了电晕放电处理对聚（L-乳酸）（PLA）、聚（ε-己内酯）（PCL）和聚（丁二酸·己二酸丁二醇酯）（PBSA）降解率的影响。处理引入含氧官能团这些聚合物的接触角下降了30～60゜，表明聚合物表面的亲水性增加。对处理和未处理的堆肥降解试验进行了测试PLA、PCL 和 PBSA 该处理抑制了 PLA 的降解，同时促进了 PCL 和 PBSA 的降解微生物（一般细菌、放线菌、真菌）与聚合物表面之间的亲和力也通过薄膜接触法进行了评估。结果显示由于电晕放电处理产生具有抗菌活性的乳酸，因此该处理降低了对 PLA 的亲和力。相反，电晕处理增加了对 PCL 的亲和力〜并且PBSA 特别是，曲霉属迅速吸附到处理过的表面，对 PCL 和 PBSA 具有显着的降解活性。脂肪酶（来自曲霉属）在聚合物表面的吸附也增加了，天然抗菌物质可在数周内抑制降解，将日本辣根提取物涂覆在 PCL 和 PBSA 薄膜上黑芥子苷（从日本辣根中提取）涂覆的 PCL 和 PBSA 薄膜成功压印降解3周，然后立即降解。同样通过常规包覆方法制备了纯PLA和PCL包覆的PLA/淀粉共混物，以控制降解速率。包覆共混物的降解抑制了2〜4周，之后立即降级