发泡引起的结晶行为对聚(己二酸丁二醇酯-对苯二甲酸丁二酯)超临界发泡珠结构的影响

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Haihui Luo, Xuanle Ou, Zhixian Dong, R. Xu, C. Lei, Dahua Chen
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引用次数: 0

摘要

发泡过程中的结晶行为会直接影响发泡特性。对于结晶聚合物而言,发泡过程中的结晶行为对细胞结构稳定性的影响尚未达成共识。在这项研究中,通过控制超临界二氧化碳的饱和温度、浸泡步骤(一步或两步)和减压速率,分别制备了 PBAT 发泡珠和未发泡颗粒。在超临界二氧化碳发泡 PBAT 珠子的 DSC 曲线中观察到了双熔峰。通过比较排气速率,我们发现发泡过程中气体的快速膨胀引起的拉伸结晶在电池的稳定过程中起着重要作用。虽然此时的结晶完善度或晶体尺寸远小于静态冷却时形成的结晶颗粒,但快速结晶却能有效稳定发泡孔隙的晶胞结构。与普通的超临界发泡工艺相比,先在高温下浸泡二氧化碳,再在低温下发泡的两步发泡工艺可增加孔径和膨胀率。在高温下,更多的二氧化碳扩散到 PBAT 粒子中,增加了粒子中用于发泡的瞬时气体浓度,快速拉伸产生的拉伸诱导结晶提高了细胞的平均尺寸,进一步增加了单个细胞的膨胀倍数。随着饱和温度从 95°C 升至 105°C,泡沫珠的平均孔径从 37.8 微米增至 48.8 微米,膨胀率也增至 8.6。两步浸泡发泡法是制造工业泡沫珠的一种更有效的方法,可以在低温下制备出更好的泡沫珠。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of foaming-induced crystallization behavior on the structure of poly(butylene adipate-co-terephthalate) supercritical foamed beads
The crystallization behavior during foaming directly affects the foaming properties. For crystalline polymers, there is no consensus on the influence of the crystallization behavior during foaming process on the stabilization of the cell structure. In this work, PBAT foamed bead and unfoamed pellets were prepared by controlling the saturated temperatures in supercritical CO2, soaking step (one or two) and the depressurization rate, respectively. Double melting peaks were observed in the DSC curve of supercritical CO2 foamed PBAT beads. By comparing the outgassing rates we find that the stretching-induced crystallization caused by the rapid expansion of the gas during foaming plays an important role in the stabilization of the cells. Although the crystalline perfection or crystal size at this time is much smaller than that of the crystalline grains formed during static cooling, the rapid crystallization is effective in stabilizing the cell structure of the foamed pores. Compared to normal supercritical foaming processes, the two-step foaming process of soaking CO2 at high temperatures followed by foaming at low temperatures results in an increase in cell size and expansion ratio. At high temperatures, more CO2 diffuses into the PBAT pellets, increasing the instantaneous gas concentration in the pellets for foaming, and the rapid stretching produces stretching-induced crystallization that raises the average size of the cells, further increasing the expansion multiplicity of individual cells. The average cell size of foam beads rises from 37.8 to 48.8 µm and the expansion ratio also increases to 8.6 with saturated temperature increasing form 95 to 105°C. The two-step soaking foaming method is a more efficient way of manufacturing industrial foamed beads, allowing for the preparation of better foam beads at low temperatures.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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