高分子与聚合物基复合材料
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乳酸接枝竹纤维/聚乳酸复合材料的制备与性能表征
陈康, 何啸宇, 李文豪, 吴义强, 李新功, 左迎峰
中南林业科技大学材料科学与工程学院,长沙 410004
Preparation and Characterization of Lactic Acid Grafted Bamboo Fiber/Polylactic Acid Composites
CHEN Kang, HE Xiaoyu, LI Wenhao, WU Yiqiang, LI Xingong, ZUO Yingfeng
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要 以乳酸接枝竹纤维和聚乳酸为原料,甘油、柠檬酸酯和甲酰胺(质量比为2∶3∶1)的复配物为增塑剂,制得乳酸接枝竹纤维/聚乳酸(LA-g-BF/PLA)复合材料。探讨了残余乳酸、乳酸接枝竹纤维/聚乳酸比例、增塑剂用量、热压温度和热压时间对复合材料力学性能及耐水性能的影响。同时,采用X射线衍射(XRD)仪、差示扫描量热(DSC)仪和热重分析(TGA)仪对复合材料进行了表征。结果表明,去除乳酸接枝竹纤维中的残余乳酸后,当乳酸接枝竹纤维与聚乳酸的质量比为3∶7、增塑剂用量为10%、热压温度为170 ℃、热压时间为6 min时,LA-g-BF/PLA复合材料的综合性能最佳。随着乳酸接枝竹纤维与聚乳酸质量比的增大,复合材料冷结晶温度和冷结晶焓值逐渐降低,结晶度逐渐增大,说明乳酸接枝竹纤维与聚乳酸之间的相互依赖性变差。特别是当乳酸接枝竹纤维与聚乳酸的质量比超过3∶7后,复合材料的界面相容性迅速变差,进而导致LA-g-BF/PLA复合材料的耐热性能下降。
关键词:
乳酸接枝竹纤维
聚乳酸
复合材料
工艺优化
界面相容性
结晶结构
耐热性能
Abstract: Lactic acid grafted bamboo fiber/polylactic acid (LA-g-BF/PLA) composites were prepared by using lactic acid grafted bamboo fiber and polylactic acid as raw materials, glycerol, citrate and formamide at a mass ratio of 2∶3∶1 as plasticizers. The effects of residual lactic acid, proportion of lactic acid grafted bamboo fiber/polylactic acid, amount of plasticizer, hot pressing temperature and time on mechanical properties and water resistance of the composites were discussed. The composites were characterized by X-ray diffraction (XRD), differential scanning ca-lorimeter (DSC) and thermogravimetric analyzer (TGA). The results showed that the comprehensive performance of LA-g-BF/PLA composite was the best when the mass ratio of lactic acid grafted bamboo fiber to polylactic acid was 3∶7, the amount of plasticizer was 10%, the hot pressing temperature was 170 ℃ and the hot pressing time was 6 min. With the mass ratio of lactic acid grafted bamboo fiber and polylactic acid, the cold crystallization temperature and enthalpy of the composites decreased gradually, and the crystallinity increased gradually. It was indicated that the interdependence between lactic acid-grafted bamboo fiber and polylactic acid became worse. Especially, when the mass ratio of lactic acid grafted bamboo fiber and polylactic acid exceeds 3∶7, the interfacial compatibility of the composites rapidly deteriorates, which leads to the decrease of heat resistance of LA-g-BF/PLA composites.
Key words:
lactic acid grafted bamboo fiber
polylactic acid
composite
process optimization
interface compatibility
crystalline structure
heat resistance
出版日期: 2020-10-25
发布日期: 2020-11-06
基金资助: 中国博士后科学基金特别资助项目(2017T100615);国家自然科学基金青年项目(31600460);国家级大学生研究性学习与创新性 实验计划项目(201810538006);湖湘青年英才计划(2019RS2040);湖南省教育厅科学研究重点项目(18A157)
通讯作者:
zuoyf1986@163.com
作者简介: 陈康,中南林业科技大学,硕士研究生。2019年毕业于中南林业科技大学,获得工学学士学位。主要从事生物质复合材料研究。 左迎峰,中南林业科技大学,副教授。2014年毕业于东北林业大学,获工学博士学位。同年加入中南林业科技大学材料科学与工程学院工作,主要从事生物质复合材料及胶黏剂改性研究。
引用本文:
陈康, 何啸宇, 李文豪, 吴义强, 李新功, 左迎峰. 乳酸接枝竹纤维/聚乳酸复合材料的制备与性能表征[J]. 材料导报, 2020, 34(20): 20171-20176.
CHEN Kang, HE Xiaoyu, LI Wenhao, WU Yiqiang, LI Xingong, ZUO Yingfeng. Preparation and Characterization of Lactic Acid Grafted Bamboo Fiber/Polylactic Acid Composites. Materials Reports, 2020, 34(20): 20171-20176.
链接本文:
http://www.mater-rep.com/CN/10.11896/cldb.19100079
或
http://www.mater-rep.com/CN/Y2020/V34/I20/20171
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