四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯对汉麻秆粉/聚乳酸木塑复合材料力学及热稳定性能的影响  

Effect of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]on mechanical properties and thermal stability of hemp straw powder/polylactic acid wood-plastic composite

作　　者：李勇刚 吴华伟 王春红[1] 王妮 LI Yonggang;WU Huawei;WANG Chunhong;WANG Ni(School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China;College of Engineering and Technology,Jiyang College of Zhejiang A&F University,Shaoxing 312000,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]浙江农林大学暨阳学院工程技术学院,绍兴312000

出　　处：《复合材料学报》2023年第7期4139-4148,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11802205)~。

摘　　要：为解决汉麻秆粉/聚乳酸木塑复合材料(Hemp straw powder reinforced polylactic acid composite,HPRPC)力学性能以及热稳定性较差的问题,采用四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯(Pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate],PTP)对HPRPC进行改性处理,并制备不同PTP添加量下的HPRPC,通过FTIR、力学性能测试、SEM、TG、吸水与缺陷分析探究PTP对HPRPC的改性机制。结果表明,PTP改性处理增强了HPRPC中汉麻秆粉(HP)与聚乳酸(PLA)的界面相容性;PTP的添加量为0.6wt%时,复合材料的力学性能、热稳定性和缺陷情况最优:与未处理的复合材料相比,改性HPRPC的拉伸强度和弯曲强度分别提高了38.08%和45.24%,力学性能显著提高;初始分解温度和最大失重速率温度分别提高了12.9℃和16.8℃,热稳定性得到改善;吸水率与吸水厚度膨胀率均达到最优,吸水率保持为未改性复合材料的50%左右,吸水厚度膨胀速率显著减缓,96 h时吸水厚度膨胀率仅为2.11%,缺陷情况得到明显改善。In order to solve the problem of poor mechanical properties and thermal stability of hemp straw powder reinforced polylactic acid composite(HPRPC),Pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate](PTP)was used to modify HPRPC.The modification mechanism of HPRPC by PTP was investigated by FTIR,mechanical properties analysis,SEM,TG and defect analysis.The results show that PTP enhances the interface compatibility of hemp straw powder(HP)and polylactic acid(PLA),and improves the interfacial properties.When the mass fraction of PTP is 0.6wt%,HPRPC has the best mechanical properties,thermal stability and defects condition.Compared with the untreated composite,the tensile strength and flexural strength of the treated HPRPC are increased by 38.08%and 45.24%,respectively.The mechanical property is significantly improved.And the initial decomposition temperature and maximum weight loss rate temperature are increased by 12.9°C and 16.8C,respectively.The thermal stability is improved.And the water absorption rate and the thickness swelling rate of HPRPC are optimized.The water absorption rate of treated HPRPC keeps about 50%of that of the untreated HPRPC.The increase of the thickness swelling rate slows down significantly,and the thickness swelling rate is only 2.11%at 96 h,the defects condition is obviously improved.

关 键 词：汉麻秆粉 木塑复合材料 界面改性 力学性能 热稳定性 

分 类 号：TB332[一般工业技术—材料科学与工程]