摘要
为了改善聚氨酯弹性体拉伸和热稳定性能,本文以环氧树脂改性木质纤维,再填充至聚氨酯(PU)弹性体中制得生物基复合材料,采用万能试验机、扫描电镜和热分析仪分别对复合材料的拉伸性能、断面形貌和热稳定性进行测试分析。结果表明:与未改性填充木质纤维复合材料相比,经水性环氧和E-51环氧树脂改性木质纤维分别填充4wt.%和2wt.%时,复合材料的拉伸强度分别由18.2 MPa提高至22.4和23.7 MPa,断裂伸长率分别由898%提高至1 124%和2 269%。其中,采用2wt.%E-51环氧树脂溶液改性木质纤维填充2wt.%时,与未改性木质纤维相比,其拉伸强度提高了6.3%,断裂伸长率提高4倍以上,这是由于环氧改性木质纤维提高了木质纤维与树脂基体间的界面相容性。失重率为5%时,与未填充PU相比,复合材料的分解温度由269℃升高至279℃,提高了3.7%。填充木质纤维可提高PU拉伸性能与热稳定性。
Polyurethane(PU)elastomer was filled with epoxy resin modified wood fiber to prepare bio-based composites.The tensile properties, sectional morphology, and thermal stability of the composites were characterized by using universal testing machine, scanning electron microscope(SEM), and thermogravimetric analyzer(TGA), respectively. Results show that when the content of waterborne epoxy and E-51 epoxy resin modified wood fiber was 4 wt.% and 2 wt.% respectively, the tensile strength of the composites increased from 18.2 MPa to 22.4 MPa and 23.7 MPa, and the elongation at break increased from 898%to 1 124% and 2 269%,compared with composites filled with unmodified wood fiber. Specifically, when the content of E-51 epoxy resin(2 wt.%)modified wood fiber was 2 wt.%, the tensile strength of the composites increased by 6.3% and the elongation at break was more than four times that of composites with unmodified fiber, since the epoxy modified wood fiber increased the interface compatibility between the wood fiber and the resin matrix. When the weight loss rate was 5%, the decomposition temperature of the composites increased from 269 ℃ to 279 ℃, an increase of 3.7% compared with unfilled PU. The tensile properties and thermal stability of PU can be improved by filling wood fibers.
作者
乔红斌
张大伟
陈文勇
田雪梅
金玲
QIAO Hongbin;ZHANG Dawei;CHEN Wenyong;TIAN Xuemei;JIN Ling(School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma'anshan 243002,China;Polymers and Solid Lubricants Research Laboratory,Industrial Technology Research Institute of Anhui University of Technology,Ma'anshan 243002,China)
出处
《材料科学与工艺》
CAS
CSCD
北大核心
2022年第4期33-41,共9页
Materials Science and Technology
基金
国家自然科学基金资助项目(51474003)。
关键词
高分子材料
聚氨酯弹性体
木质纤维
环氧树脂
拉伸强度
复合材料
polymer material
polyurethane elastomer
wood fiber
epoxy resin
tensile strength
composite material
