A one-step method to manufacture biodegradable poly (butylene adipate-co-terephthalate) bead foam parts
A one-step method to manufacture biodegradable poly (butylene adipate-co-terephthalate) bead foam parts
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一种一步法制造可生物降解的聚（己二酸-对苯二甲酸丁二醇酯）珠状泡沫部件
DOI：
10.1002/pat.5219
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发表时间：
2021-03-16
影响因子：
3.4
通讯作者：
Li, Sai
中科院分区：
文献类型：
--
作者：
Cai, Wenrui;Liu, Pengju;Li, Sai
由废塑料，特别是来自泡沫包装的废塑料造成的污染越来越严重，利用可生物降解材料被认为是处理这一环境问题的有前途的解决方案。聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）（PBAT）是一种典型的环境友好型聚合物，具有公认的生物降解性和优异的力学性能。然而，利用超临界流体发泡技术制备PBAT珠状泡沫材料的工作还很少，相关的发泡行为还不清楚。以超临界二氧化碳（Sc-CO2）为发泡剂，对PBAT和PBAT-聚乳酸（PLA）珠粒进行发泡，系统研究了珠粒的发泡行为以及一步发泡法制备的珠粒发泡制品的力学性能。PLA的引入增强了组合物的机械性能。在最佳发泡条件下，PBAT/PLA泡沫的发泡倍率为13.44 × 10（8）个/cm（3），泡孔密度为4.08 × 10（8）个/cm（3）。得益于均匀的泡孔结构，珠粒泡沫部件显示出优异的回弹性和弹性，粘合强度为0.57 MPa，压缩强度为1.05 MPa。同时，PBAT和PBAT-PLA发泡制品具有较高的表面质量和良好的珠间烧结性能。PBAT可以作为传统非聚合物泡沫塑料的替代品用于包装、家用和汽车领域。
Pollution caused by waste plastic, particularly from the foam packages, is increasingly worse, and utilizing biodegradable material is considered a promising solution to handle this environmental issue. Poly (butylene adipate-co-terephthalate) (PBAT) is a typical environment-friendly polymer due to the recognized biodegradability and excellent mechanical performance. However, there have been very few works preparing PBAT bead foams via the supercritical fluid foaming technology, and the related foaming behavior is still unclear. In this study, we foamed PBAT and PBAT-polylactide (PLA) beads using supercritical carbon dioxide (Sc-CO2) as a foaming agent, and the foaming behaviors of beads as well as the mechanical properties of bead foam parts manufactured by one-step foaming method were systematically investigated. The incorporation of PLA enhanced the mechanical properties of the composition. At the optimal foaming conditions, the expansion ratio and cell density of PBAT/PLA foam were 13.44 and 4.08 x 10(8) cells/cm(3), respectively. Benefitting from the uniform cell structure, the bead foam part showed excellent resilience and elasticity with adhesive strength of 0.57 MPa and compression strength of 1.05 MPa. Meanwhile, PBAT and PBAT-PLA foam parts had high surface quality and good interbead sintering properties. PBAT can be a promising substitute for traditional non-polymer foams for packaging, household, and automobile fields.