聚乳酸/纤维素纳米复合材料的制备及其结晶性能和力学性能的增强。
The fabrication of polylactide/cellulose nanocomposites with enhanced crystallization and mechanical properties.
机构信息
Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China.
Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China; Collaborative Innovation Center for Eco-Textiles of Shandong Province, Qingdao University, Qingdao 266071, China.
出版信息
Int J Biol Macromol. 2020 Jul 15;155:1578-1588. doi: 10.1016/j.ijbiomac.2019.11.135. Epub 2019 Nov 18.
Polylactide/cellulose nanocomposites were fabricated by blending of commercial polylactide (PLA) and modified cellulose nanocrystals (CNCs). Modified CNCs were prepared via the in situ polymerization of CNCs and L-lactic acid (CNCs-PLLA) or D-lactic acid (CNCs-PDLA). The actual occurrence of chemical bond between CNCs and PLA segment was confirmed by Fourier transform infrared, nuclear magnetic resonance, X-ray diffraction and solubility tests. Differential scanning calorimetry and X-ray diffraction characterization indicated that CNCs-PDLA better improved the crystallization ability of PLA matrix compared with CNCs-PLLA. Furthermore, compared with the neat PLA (60.0 MPa), the tensile strength of resulting nanocomposites showed an enhancement of up to 36% (81.65 MPa). And the nanocomposites with CNCs-PDLA exhibited both high crystallinity and improved mechanical properties.
聚乳酸/纤维素纳米复合材料是通过商业聚乳酸（PLA）和改性纤维素纳米晶体（CNCs）共混制备的。改性 CNCs 是通过 CNCs 和 L-丙交酯（CNCs-PLLA）或 D-丙交酯（CNCs-PDLA）的原位聚合制备的。通过傅里叶变换红外、核磁共振、X 射线衍射和溶解度测试证实了 CNCs 和 PLA 段之间实际发生了化学键合。差示扫描量热法和 X 射线衍射分析表明，与 CNCs-PLLA 相比，CNCs-PDLA 更能提高 PLA 基体的结晶能力。此外，与纯 PLA（60.0 MPa）相比，所得纳米复合材料的拉伸强度提高了 36%（81.65 MPa）。并且，含有 CNCs-PDLA 的纳米复合材料既具有高结晶度又具有良好的力学性能。
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