完全生物降解聚乳酸流延纸塑复合材料的制备及性能研究

Study on Preparation and Properties of Casting of Fully-biodegradable Polylactide Paper Plastic Laminates

可生物降解聚乳酸(PLA)是一种具有巨大的市场潜力、最有前途的、来源于植物资源(如谷物、木薯)的聚合物,但它的热稳定性、力学性能和加工性能差,应用受到限制。利用聚1,2-丙二醇己二酸酯(PPA)作为增塑剂来改善PLA的加工性能,同时保持材料的生物降解性能。由于PPA的增塑作用,PLA的熔融流变性和黏附性有很大改善。通过挤出流延工艺,将增塑PLA与纸辊压复合形成PLA纸塑复合材料,该复合材料较纸张具有更高的拉伸强度和撕裂强度,阻水性好,可以进一步制备医用外敷制品,如手术床单、医用围巾等。

Biodegradable polylactide （PLA） is regarded as one of the most promising biopolymers with a large market potential, but its applications are limited by poor thermal stability, mechanical properties and processibility. Poly（1,2-propylene glycol adipate） （PPA） as plasticizer was utilized to improve PLA＇s performance without compromising the biomass origin and compostable properties of the material. Due to the plasticization effect of PPA, the melt rheology of PLA and the adhesion of the result paper plastic laminates are greatly improved. Through the extrusion casting process, the plasticized PLA with paper are rolled forming PLA/paper laminates. The laminates have a higher tensile strength and tear strength, good water resistance comparing with paper, which can be further prepared using as medical products, such as operation sheet, medical scarf.