模压与压延成型对PLA/TPEE共混物结构和性能的影响  

Impacts of Compression Moulding and Calendaring on Structure and Properties of PLA/TPEE Blends

作　　者：马昭 沈伽宁 王凯 徐鼐[1] 庞素娟[2] 潘莉莎[3] 黎坛 Ma Zhao;Shen Jianing;Wang Kai;Xu Nai;Pang Sujuan;Pan Lisha;Li Tan(School of Materials Science and Engineering,Hainan University,Haikou 570228,China;School of Science,Hainan University,Haikou570228,China;School of Chemical Engineering and Technology,Hainan University,Haikou 570228,China;Hainan Shiner Industrial Co.,Ltd.,Haikou 570125,China)

机构地区：[1]海南大学材料科学与工程学院,海口570228 [2]海南大学理学院,海口570228 [3]海南大学化学工程与技术学院,海口570228 [4]海南赛诺实业有限公司,海口570125

出　　处：《工程塑料应用》2022年第5期74-81,共8页Engineering Plastics Application

基　　金：海南省财政科技计划项目(ZDYF2019013);国家自然科学基金项目地区科学基金(51663010)。

摘　　要：采用模压和压延两种成型工艺制备了不同配比的聚乳酸/热塑性聚酯弹性体(PLA/TPEE)共混物试样,通过研究两种试样的拉伸性能、微观形貌以及结晶结构等性质,探究不同成型工艺对材料性能影响。扫描电子显微镜观察显示,不同于PLA/TPEE模压试样的“海-岛”状微相结构,压延试样存在大量的TPEE分散相形变和取向结构。拉伸性能测试表明,当TPEE含量为25份时,压延试样的断裂伸长率、拉伸屈服强度和拉伸弹性模量分别达到255.8%,48.13 MPa和1637.8 MPa,相较于模压试样分别提高了10.5%,35.0%和25.5%。所有试样经过热处理后结晶度均得到明显提高。当TPEE含量为25份时,热处理PLA/TPEE模压试样的断裂伸长率降低至52.8%,而热处理压延试样的断裂伸长率仍能保持在192.0%。同时,相较于热处理模压试样,其拉伸屈服强度和拉伸弹性模量进一步得到增强。结合实验数据,对上述模压试样和压延试样的拉伸断裂机理进行了分析和讨论。最终,通过压延成型工艺可制备出综合性能更加优异的PLA/TPEE共混材料及制品。Poly(lactic acid)/thermoplastic polyester elastomer(PLA/TPEE)blends with different TPEE content were processed by two different techniques i.e.compression moulding and calendaring,the tensile performances,micro-morphology and crystallization properties of the blends were investigated for explore the influence of different molding processes on properties of the blends.Compared with the“sea-island”phase structure in the PLA/TPEE compression-molded samples,it is confirmed by scanning electron microscope observation that there are innumerable stretched and oriented TPEE dispersed phases formed in the calendered samples.Tensile tests show that when the content of TPEE is 25 phr,the elongation at break,tensile yield strength and tensile modulus of the calendered sample reach 255.8%,48.13 MPa and 1637.8 MPa,respectively,which are 10.5%,35.0%and 25.5%higher than those of the compression-molded sample.The crystallinity of all samples increase obviously after heat treatment.When the content of TPEE increases to 25 phr,the elongation at break of heat-treated sample prepared by compression molding largely reduces to 52.8%.As a contrast,the heat-treated sample with the same composition ratio prepared by calendaring still keeps a better tensile ductility,and its elongation at break remained as high as 192.0%.Combination with the experiment data,the tensile fracture mechanisms for the compression-molded samples and the calendered ones were analyzed and discussed carefully.Finally,a series of PLA/TPEE blend samples with better comprehensive performances can be prepared by the calendaring technique.

关 键 词：聚乳酸 热塑性聚酯弹性体 成型工艺 热处理 拉伸性能 

分 类 号：TQ321[化学工程—合成树脂塑料工业]