材料科学
极限抗拉强度
玻璃化转变
氢键
复合材料
混溶性
聚合物
增塑剂
化学工程
木聚糖
动态力学分析
高分子化学
分子
多糖
化学
有机化学
工程类
作者
Yanjun Chen,Jie Dai,Xin Shen,Junqiang Shan,Yulian Cao,Tianpeng Chen,Hanjie Ying,Chenjie Zhu,Ming Li
标识
DOI:10.1016/j.carbpol.2023.121592
摘要
PBAT composites with biomass fillers have gained considerable attention as alternatives to non-biodegradable plastics. This work employed xylan derivatives as fillers for PBAT composites. Xylan was modified by introducing cinnamoyl side groups which limit the hydrogen bonding and construct π-π stacking interactions with PBAT chains. The resultant xylan cinnamates (XCi) show degree of substitution (DS) of 0.55–1.89, glass-transition temperatures (Tg) of 146.5–175.0 °C and increased hydrophobicity, which can be simply controlled by varying the molar ratio of reactants. NMR results demonstrate that the C3-OH of xylopyranosyl unit is more accessible to cinnamoylation. XCi fillers (30–50 wt%) were incorporated into PBAT through melt compounding. The filler with a DS of 0.97 exhibited the optimal reinforcing effect, showing superior tensile strength (19.4 MPa) and elongation at break (330.9 %) at a high filling content (40 wt%), which is even beyond the neat PBAT. SEM and molecular dynamics simulation suggest improved compatibility and strengthened molecular interaction between XCi and PBAT, which explains the suppressed melting/crystallization behavior, the substantial increase in Tg (−34.5 → -1.8 °C) and the superior mechanical properties of the composites. This research provides valuable insights into the preparation of high-performance composites by designing the molecular architecture of xylan and optimizing the associated interactions.
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