通过共聚合和多臂分支策略来增强聚乳酸强度的协同效应
Jinbo Hu1, Wenbo Wang1, Xinyan Liu1
1Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, PR China.
这项研究通过共聚合和多臂分支来增强聚乳酸 (PLA) 融强度. 修改后的PLA显示显著提高粘度,并使高质量的泡材料的生产.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 类风病学 类风病学 类风病学
背景情况:
- 聚乳酸 (PLA) 的低强度限制了其在各种应用中的使用.
- 制定提高PLA融强度的策略对于扩大其材料效用至关重要.
研究的目的:
- 通过共聚合和多臂分支来提高聚乳酸 (PLA) 的结强度.
- 为了研究共纳体结构和性对质性质的影响.
- 探索以改善融强度的基于PLA的泡材料的生产.
主要方法:
- 聚烯的共聚合与通过热酸盐催化合成的立体异构周期性单体 (CEM).
- 风湿学测试用于测量线性和分支共聚合物的零剪切粘度 (η0).
- 使用三甲基为发起剂合成三臂PLA共聚合物.
- 拉伸测试以评估机械性能和泡生产试验.
主要成果:
- 包含1mol%的CEM单元使线性PLA零剪切粘度增加了467%.
- 具有长链分支结构和相反拉性的CEM显示出最显著的增强.
- 三臂PLA共聚合物在零剪切粘度上表现出高达67倍的增加.
- 聚乙烯共聚合物保持了与整洁的PLA (拉伸强度~65MPa) 相比的机械性能.
- 高强度使得生产均的,闭细胞的基于PLA的泡成为可能.
结论:
- 与特定的CEM联合聚合有效地提高了PLA融强度和粘度.
- 多臂分支进一步放大了融强度的改善,创造了拓改变的聚合物.
- 开发的方法为设计具有量身定制的融强度的PLA材料提供了可行的途径,用于诸如泡生产等应用.
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