Blends of Poly(butylene glutarate) and Poly(lactic acid) with Enhanced Ductility and Composting Performance
Blends of Poly(butylene glutarate) and Poly(lactic acid) with Enhanced Ductility and Composting Performance
复制标题
DOI：
10.1021/acsapm.1c00078
复制
发表时间：
2021-02-25
影响因子：
5
通讯作者：
Locklin, Jason
中科院分区：
文献类型：
--
作者：
Holt, Apisata;Ke, Yutian;Locklin, Jason
人们对聚丙交酯（PLA）与聚戊二酸丁二醇酯（PBG）的共混物进行了研究，重点是改善PLA的脆性并提高工业堆肥条件下的降解率。 PBG是通过1,4-丁二醇(C4)和戊二酸(C5)之间的熔融缩聚合成的。二羧酸单体中奇数碳原子数的影响导致熔融温度（T-m）和结晶含量降低，从而导致堆肥降解率增加。通过溶液流延和热压制备了与不同成分的PBG共混的PLA薄膜。使用多种技术研究了共混物的物理、机械和粘弹性行为以及形态。所有 PLA/PBG 共混物的玻璃化转变温度 (T-g) 和拉伸强度均有所下降，但断裂伸长率百分比有所增加。使用呼吸测量法研究 PBG 和选定的 PLA/PBG 混合物的堆肥降解性。考虑到所有进行的分析，在 PLA 中添加 PBG 改善了 PLA 的脆性，并加快了工业堆肥中的降解速度。 PLA/PBG 共混物比 PLA 与聚丁二酸丁二醇酯（一种在许多热塑性应用中通常与 PLA 复合的聚合物）的共混物表现出更高的延展性。 PBG 在 PLA 基质中的相容性取决于 PBG 在 PLA 基质中的浓度，超过 3 wt% 时相分离明显。
Blends of poly(lactide) (PLA) with poly(butylene glutarate) (PBG) have been investigated with a focus on the improvement of PLA brittleness and an enhancement of the degradation rate under industrial composting conditions. PBG was synthesized by melt polycondensation between 1,4-butanediol (C4) and glutaric acid (C5). The effect of the odd carbon atom number in the dicarboxylic acid monomer caused a decrease in melting temperature (T-m) and crystalline content, and subsequently an increase in composting degradation rate. The films of PLA blended with various compositions of PBG were prepared by solution casting and hot pressing. Physical, mechanical, and viscoelastic behavior along with morphology of the blends were investigated using a variety of techniques. All PLA/PBG blends showed a decrease in both glass transition temperature (T-g) and tensile strength, but showed an increase in the % elongation at break. The composting degradability of PBG and selected PLA/PBG blends were investigated using respirometry. Considering all of the analyses performed, adding PBG to PLA improved the brittleness of PLA and accelerated the rate of degradation in industrial composting. PLA/PBG blends exhibited higher ductility than the blends of PLA with poly(butylene succinate), a polymer commonly compounded with PLA in many thermoplastic applications. The compatibility of PBG in a PLA matrix was dependent on the concentration of PBG in the PLA matrix, with phase separation evident above 3 wt %.