| 天然橡胶和纤维素纳米晶对聚乳酸的共混改性研究 |
| Blending Modification of Polylactide with NR and CNC |
| 投稿时间：2020-02-17 修订日期：2020-02-17 |
| DOI：10.12136/j.issn.1000-890X.2020.05.0362 |
| 中文关键词: 聚乳酸 天然橡胶 接枝 改性 丙烯酸丁酯 纤维素纳米晶 力学性能 结晶性能 热稳定性 |
| 英文关键词: polylactide NR grafting modification BA CNC mechanical property crystallization property thermal stability |
| 基金项目:国家自然科学基金资助项目（51703038）；贵州省一流大学专业重点建设项目（2017158134）；贵阳市科技局-贵阳学院科研专项资金资助项目[GYU-KYZ（2019-2020）PT23-04] |
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| 中文摘要: |
| 通过在天然橡胶（NR）分子链上接枝丙烯酸丁酯（BA）制备接枝改性物NR-g-PBA，并将NR-g-PBA以及NRg-PBA和纤维素纳米晶（CNC）分别与聚乳酸（PLA）熔融共混，得到PLA/NR-g-PBA二元共混物和PLA/NR-g-PBA/CNC三元共混物。研究NR-g-PBA和CNC对共混物力学性能、结晶性能和热稳定性的影响。结果表明：与PLA相比，
PLA/NR-g-PBA二元共混物的韧性提高，但拉伸强度降低；随着CNC用量增大，PLA/NR-g-PBA/CNC三元共混物的拉伸强度和拉断伸长率均呈先提高后降低趋势，PLA/NR-g-PBA/CNC共混物（CNC相对于PLA的质量分数为0. 005）的拉伸强度最高，PLA/NR-g-PBA/CNC共混物（CNC相对于PLA的质量分数为0. 01）的拉断伸长率最高；PLA/NR-g-PBA二元共混物和PLA/NR-g-PBA/CNC三元共混物的结晶温度和结晶度均比纯PLA有所提高；NR-g-PBA和CNC的引入有助于提高PLA的热稳定性。 |
| 英文摘要: |
| The grafted polymer NR-g-PBA was prepared by grafting butyl acrylate（BA） onto natural rubber（NR） molecular chains，and PLA/NR-g-PBA binary blends and PLA/NR-g-PBA/cellulose nanocrystals（CNC） ternary blends were obtained by melt blending. The effects of NR-g-PBA and CNC
on the mechanical properties，crystallization properties and thermal stability of the blends were studied. The results showed that，compared with PLA，the toughness of PLA/NR-g-PBA binary blends was improved，but the tensile strength was reduced. As the amount of CNC increased，the tensile strength and elongation at break of the PLA/NR-g-PBA/CNC ternary blends increased first and then decreased. When the mass fraction of CNC relative to PLA was 0. 005，PLA/NR-g-PBA/CNC blend showed the highest tensile strength，and when the mass fraction of CNC relative to PLA was 0. 01，the PLA/NR-g-PBA/CNC blend had the highest elongation at break. The crystallization temperature and crystallinity of the PLA/NR-g-PBA binary blends and PLA/NR-g-PBA/CNC ternary blends were higher than those of pure PLA，respectively.The introduction of NR-g-PBA and CNC helped to improve the thermal stability of PLA. |
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