文章摘要
Blending Modification of Polylactide with NR and CNC
Received:February 17, 2020  Revised:February 17, 2020
DOI：10.12136/j.issn.1000-890X.2020.05.0362
Key Words: polylactide；NR；grafting；modification；BA；CNC；mechanical property；crystallization property；thermal stability
Author NameAffiliationE-mail
LIU Shuanghui Guiyang University 870302499@qq.com 
CAO Ziting Guiyang University  
ZHU Jiazhan Guiyang University  
SONG Ping Guiyang University  
ZHANG Chunmei* Guiyang University zhangzhang_87@126.com 
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Abstract:
      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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