热塑性聚酯弹性体泡沫的高效制造,具有高膨胀率和优越的尺寸稳定性

IF 4.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL
Yujiao Zhai , Jing Zhang , Jiale Chen , Fenghao Shi , Yucai Li , Xin Wu , Chunling Xin , Yadong He
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引用次数: 0

摘要

由于其线性分子链结构,热塑性聚酯弹性体(TPEE)固有地表现出较差的熔体粘弹性和不足的基体强度。这些限制影响了它的发泡性能,给高性能TPEE泡沫的制造带来了挑战。因此,本工作采用环氧扩链剂KL-E4370B对TPEE进行改性。结果表明,改性后的TPEE分支度显著提高,熔体粘弹性提高了3个数量级。发泡温度窗加宽30℃,膨胀比由1.80增加到25.01。改性后的TPEE结晶度降低29.96 %,提高了透气性。这种改进有效地缓解了泡沫收缩,同时加速了恢复过程。当KL-E4370B含量为1.0 wt%时,分子链之间形成微交联网络,增强了基体弹性模量,使TPEE泡沫具有优异的自恢复能力。在此基础上,通过调节KL-E4370B的含量,成功制备出具有高膨胀率和尺寸稳定性的TPEE泡沫,为工程高性能热塑性弹性体泡沫开辟了一条新途径。Kohlrausch-Williams-Watts (KWW)模型分析进一步表明,膨胀率的增加导致细胞壁应变的增大,从而减少了TPEE软段的松弛时间,缩小了其松弛时间分布。这一机制解释了实验观察到的泡沫加速收缩行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Efficient fabrication of thermoplastic polyester elastomer foams with high expansion ratio and superior dimensional stability
Due to its linear molecular chain structure, thermoplastic polyester elastomer (TPEE) exhibits inherently poor melt viscoelasticity and inadequate matrix strength. These limitations impair its foaming behavior and pose challenges in fabricating high-performance TPEE foams. Therefore, this work employed an epoxy chain extender (KL-E4370B) to modify TPEE. Results demonstrate that modified TPEE achieved a substantially enhanced branching degree, accompanied by a three orders of magnitude improvement in melt viscoelasticity. Notably, foaming temperature window broadened by 30 °C, while expansion ratio increased from 1.80 to 25.01. Moreover, modified TPEE exhibited a 29.96 % reduction in crystallinity, which enhanced gas permeability. This improvement effectively mitigated foam shrinkage while simultaneously accelerating recovery process. At 1.0 wt% KL-E4370B content, micro-crosslinked networks formed between molecular chains, enhancing matrix elastic modulus endowing TPEE foam with excellent self-recovery capability. Building on these results, this work successfully developed TPEE foams with simultaneous high expansion ratio and superior dimensional stability by regulating KL-E4370B content, establishing a novel strategy for engineering high-performance thermoplastic elastomer foams. Kohlrausch-Williams-Watts (KWW) model analysis further demonstrated that enhanced expansion ratio induced greater cell wall strain, which reduced the relaxation time of TPEE’s soft segments while narrowing their relaxation time distribution. This mechanistic explains the accelerated foam shrinkage behavior observed experimentally.
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来源期刊
Journal of Supercritical Fluids
Journal of Supercritical Fluids 工程技术-工程:化工
CiteScore
7.60
自引率
10.30%
发文量
236
审稿时长
56 days
期刊介绍: The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.
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