塑化淀粉分子结构变化对生物质复合材料力学性能的影响

发布时间：2018-01-13 03:32

  本文关键词：塑化淀粉分子结构变化对生物质复合材料力学性能的影响　出处：《北京化工大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

  更多相关文章： 生物质复合材料 塑化淀粉 分子结构 结晶结构 力学性能

【摘要】：植物纤维与淀粉结合制得用于包装领域的新型植物纤维淀粉基生物质复合材料,淀粉塑化改善了植物纤维淀粉基生物质复合材料制品性能。为揭示塑化过程促使淀粉理化性能发生变化的深层机制,对塑化后淀粉的分子结构变化展开研究。利用红外光谱分析(FT-IR)和X射线衍射分析(XRD)对热塑性淀粉内部分子之间的氢键变化和结晶度进行分析表征,以研究塑化过程中淀粉分子官能团以及结晶结构的变化,结果表明:塑化过程中淀粉结晶结构发生变化,结晶区A型结晶遭到破坏;塑化剂与淀粉分子中的羟基之间形成了新的氢键,淀粉分子羟基官能团被削弱。力学性能测试表明,塑化使淀粉分子结构发生变化后,由其制备的植物纤维淀粉基生物质复合材料的抗拉、抗压强度得到明显提升,防水性得到改善。淀粉结晶区被打破,无定形区增多,淀粉更加紧密地附着在植物纤维表面,因此复合材料的抗拉等力学性能得到了明显提升。防水性得到提高的原因在于塑化后淀粉链中亲水的羟基被削弱,淀粉的红外光谱分析中塑化淀粉的羟基伸缩振动峰减弱验证了此结论。
[Abstract]:Plant fiber combined with starch prepared for new plant fiber and starch based biomass composite packaging, starch plasticizing improves the performance of plant fiber and starch based bio composite products. In order to reveal the underlying mechanism of Starch Physicochemical Properties to the plasticizing process changes, to study the molecular structure changes of starch plasticized by infrared spectroscopy. (FT-IR) and X ray diffraction (XRD) characterization of hydrogen bond and change between crystalline thermoplastic starch molecules, with the changes of starch molecules in the plasticizing process of functional groups in the crystalline structure and the results show that the change of crystal structure of starch plasticizing process, crystalline A crystal was damaged; the formation of hydrogen bonds between the plasticizer and the hydroxyl group of starch molecules, starch molecular hydroxyl groups was weakened. The mechanical properties test showed that the starch plasticized. The molecular structure changes, made of plant fiber and starch based bio composites prepared by its tensile strength, compressive strength has improved significantly, water resistance was improved. The starch crystalline region is broken, the amorphous region of starch increased, more closely attached on the surface of plant fiber, so the tensile mechanical properties obviously improve waterproof property is improved. The reason is that the plasticization of the starch chain hydrophilic hydroxyl groups are weakened, the infrared spectrum analysis of starch hydroxyl stretching vibration peak in plasticized starch decreased validates this conclusion.

【作者单位】： 山东大学机械工程学院高效洁净机械制造教育部重点实验室;
【基金】：国家自然科学基金(51275278)
【分类号】：TB332
【正文快照】： 引言在材料领域,基于可持续发展和环境保护两方面的考虑,利用可再生的天然高分子材料为原料制备新型全降解绿色材料面临着重要的发展机遇。植物纤维淀粉基生物质复合材料是以植物纤维、淀粉为主要原料,加入少量添加剂,经一次模压发泡工艺制备而成[1-2],因其原料可再生、制品可，

本文编号：1417303