竹原纤维增强聚乳酸完全可降解材料的性能研究

以竹原纤维、聚乳酸为原料,采用非织造结合模压成型工艺制备了完全可降解材料。研究了材料降解随时间的变化规律及材料中增强纤维体积分数对材料拉伸、弯曲及降解性能的影响,采用扫描电子显微镜和傅立叶变换红外光谱仪研究了材料的降解机理。结果表明,当纤维体积分数为50%时,材料的纵横向拉伸强度和弯曲强度均达最大,分别为20.60、15.12MPa和27.47、21.27MPa;材料的降解速率随时间增加呈加快趋势,且纤维含量高的材料降解较快;降解首先发生在材料界面的缝隙处,随后产生了树脂开裂和纤维降解。

STUDY ON PROPERTIES OF RAW BAMBOO FIBERS REINFORCED POLYACTIDE BIODEGRADABLE MATERIAL

Raw bamboo fibers reinforced polylactide biodegradable material was prepared by means of non-woven method and moulding pressing technology.The effects of fibers volume fraction on tensile,bending and biodegradable properties of the material,together with the effect of time on biodegradation were discussed respectively,and the biodegradation mechanisms were studied by SEM and FTIR.The results revealed that the tensile and bending strengths get the peak at the fibers volume fraction of 50%,where the longitudinal and transverse tensile strengths were 20.60,15.12 MPa,the bending strengths were 27.47,21.27 MPa respectively;and the biodegradation first occured at the cracks of interface,then matrix crazed and fibers eroded,which increased with fibers volume fraction and time.