Development of a Bead Foam from an Engineering Polymer with Addition of Chain Extender: Expanded Polybutylene Terephthalate
Development of a Bead Foam from an Engineering Polymer with Addition of Chain Extender: Expanded Polybutylene Terephthalate
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DOI：
10.1021/acs.iecr.8b04799
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发表时间：
2018-12-19
影响因子：
4.2
通讯作者：
Altstaedt, Volker
中科院分区：
文献类型：
--
作者：
Standau, Tobias;Haedelt, Bianca;Altstaedt, Volker
在这项工作中，描述了以连续工艺从工程聚合物聚对苯二甲酸丁二醇酯 (PBT) 开发珠状泡沫的过程。该聚合物通过多功能环氧扩链剂（CE）进行化学改性，以改善流变性能、发泡行为和珠粒的融合。剪切实验表明化学修饰导致支化结构的形成。由于扩链剂，粘度和熔体强度增加。此外，还观察到经 CE 改性的 PBT 的应变硬化。结果表明，改性PBT具有增强的发泡性能；即，实现了更高的扩增以及更均匀和更精细的细胞形态。首次采用蒸汽箱成型工艺生产和焊接发泡聚对苯二甲酸丁二醇酯珠状泡沫 (E-PBT)。蒸汽箱成型珠部件的密度低至 170 kg/m(3)。就膨胀和焊接行为而言，扩链剂的最佳浓度被确定为 1 wt%。
In this work, the development of a bead foam from the engineering polymer polybutylene terephthalate (PBT) in a continuous process is described. The polymer was chemically modified by means of multifunctional epoxy chain extender (CE) to improve the rheological properties, the foaming behavior, and the fusion of the beads. Shear experiments indicated the formation of branched structures as a result of the chemical modification. Viscosity and melt strength were increased due to the chain extender. Also, strain hardening was observed for PBT modified with CE. It was shown that modified PBT has enhanced foaming behavior; namely, a higher expansion and more homogeneous and finer cell morphology were achieved. For the first time, expanded polybutylene terephthalate bead foams (E-PBT) were produced and welded in a steam chest molding process. The parts from steam chest molded beads showed a density down to 170 kg/m(3). An optimum concentration of chain extender in terms of expansion and welding behavior was identified as 1 wt %.