摘要
为提高木质素与高密度聚乙烯(HDPE)的相容性,以乙烯基三乙氧基硅烷(TEVS)作为表面改性剂对木质素进行疏水化预处理,采用开炼-热压法制备高密度聚乙烯/乙烯基硅烷改性木质素(HDPE/TEVS-Lig)复合材料。研究TEVS对HDPE/TEVS-Lig力学性能的影响,TEVS-Lig对HDPE/TEVS-Lig的界面相容性、力学性能、熔融结晶性能和热稳定性的影响。结果表明:TEVS被成功引入木质素表面,颗粒均匀性显著提高。当TEVS含量为0.6%,HDPE/TEVS-Lig力学性能最优。当TEVS-Lig含量为3%,TEVS-Lig与HDPE两相界面呈连续相,拉伸强度以及断裂伸长率达到最优。随着TEVS-Lig含量的增加,HDPE/TEVS-Lig的熔融温度先升高后降低,而结晶温度和结晶焓整体上均提高。TEVS-Lig虽然降低了HDPE/TEVS-Lig的热稳定性,但能够提高HDPE/TEVS-Lig的残炭率。
In order to improve the compatibility of lignin with high density polyethylene(HDPE), vinyltriethoxysilane(TEVS) was used as surface modifier for hydrophobic pretreatment of lignin, and high density polyethylene/vinyl silane modified lignin(HDPE/TEVS-Lig) composites were prepared by open-smelting-hot pressing method. The effects of TEVS on the mechanical properties of HDPE/TEVS-Lig were studied. The effects of TEVS-Lig on the interfacial compatibility, mechanical properties, melt crystallization properties and thermal stability of HDPE/TEVS-Lig were studied. The results show that TEVS is successfully introduced into lignin surface and particle uniformity is significantly improved. When the content of TEVS is 0.6%, HDPE/TEVS-Lig has the best mechanical properties. When the content of TEVS-Lig is 3%, the interface between TEVS-Lig and HDPE is continuous, and the tensile strength and elongation at break are the best. With the increasing of TEVS-Lig content, the melting temperature of HDPE/TEVS-Lig increases first and then decreases, while the crystallization temperature and crystallization enthalpy increase as a whole. Although TEVS-Lig reduces the thermal stability of HDPE/TEVS-Lig, it can improve the carbon residue rate of HDPE/TEVS-Lig.
作者
刘忠林
刘婉玉
冼学权
马蓝宇
黎演明
LIU Zhong-lin;LIU Wan-yu;XIAN Xue-quan;MA Lan-yu;LI Yan-ming(National Engineering Research Center for Non-Food Biorefinery,State Key Laboratory of Non-Food Biomass and Enzyme Technology,Advanced Materials Industry Institute of Guangxi Academy of Science,Nanning 530007 China)
出处
《塑料科技》
CAS
北大核心
2022年第6期1-5,共5页
Plastics Science and Technology
基金
广西科学研究与技术开发计划项目(桂科AB20238011)
南宁市科学研究与技术开发计划项目(20201061)
广西自然科学面上基金项目(2020GXNSFAA159114)
河池市科技重点研发(河科AB210304)。
关键词
木质素
高密度聚乙烯
表面疏水化改性
硅烷偶联剂
Lignin
High density polyethylene
Surface hydrophobic modification
Silane coupling agent
