聚乳酸及碳酸钙复合物的制备及碳酸钙的降解抑制作用.pdfVIP

Material Sciences 材料科学, 2012, 2, 89-95 doi:10.4236/ms.2012.22016 Published Online April 2012 (/journal/ms) Preparation of PLA/CaCO Composites and 3 the Retardation Effect of CaCO3 on the Hydrolytic * Degradation of the PLA in the Composites Huaimin Guan1,2, Shijun Huang1,2, Yuejin Tong1,2# 1College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 2Fujian Key Laboratory of Polymer Materials, Fuzhou Email: #tongyuejin@ Received: Feb. 18th, 2012; revised: Feb. 29th, 2012; accepted: Mar. 7th, 2012 Abstract: The poly (lactic acid) (PLA)/CaCO3 composites were prepared via melt blending in an intensive mixer of the torque rheometer. Hydrolytic degradation of the composites obtained was investigated comparatively with the pure PLA. The hydrolytic degradation was carried out by immersing the film samples in phosphate buffer saline (pH = 7.4) at 37˚C, and the intrinsic viscosity of the PLA in the degraded and nondegraded films was measured. The results indicated that the hydrolytic degradation of the PLA matrix in the composites was retarded as a result of the incorporation of the basic CaCO3 which would react with the partial end-carboxyl groups of the PLA matrix. It was showed that the tensile strength, elastic modulus, elongation at break and maximum load of the composites were enhanced significantly. Also it was found that the water absorption of the PLA/CaCO3 composites at low CaCO3 loading (2% and 5%) slightly increased compared with the pure PLA upon immersion for 4 weeks, while the PLA/CaCO3-7 c