Phase structures and transition behaviors in polymers containing rigid rodlike backbones with flexible side chains. V. Methylene side-chain effects on structure and molecular motion in a series of polyimides

3区工程技术 Q1 Materials Science

Journal of Polymer Science. Part B, Polymer Physics Pub Date : 1999-07-15 DOI:10.1002/(SICI)1099-0488(19990715)37:14<1633::AID-POLB8>3.0.CO;2-#

K. Mccreight, J. J. Ge, M. Guo, I. Mann, Fuming Li, Zhihao Shen, Xiaoming Jin, F. Harris, Stephen Z. D. Cheng

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引用次数: 30

Abstract

A series of organo-soluble hairy-rod polyimides was recently synthesized from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and di[n-alkyl]-4,4′-diamino-6,6′-dibromo-2,2′-biphenyldicarboxylate with side chains of varying lengths (the numbers of methylene units), BACBP(n). Dynamic mechanical (DM) results reveal two cooperative relaxation processes for BACBPs(n > 10), which correspond to the two (low- and high-) transition temperatures observed in differential scanning calorimetry (DSC). For BACBPs(n 10)] and possibly the medium- [for BACBPs(n 10)] adopt monoclinic unit cells, whereas those having the short side chains [BACBPs(n ≤ 10)] possess hexagonal unit cells. The drastic temperature difference between the low- and medium-relaxation processes observed in DM experiments may be explained because of a change in the lateral packing arising from the variation of the side-chain length. The limited mobility afforded the BACBPs(n ≤ 10) is a result of their more ordered conformation and interdigitation between the neighboring side chains. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 1633–1646, 1999

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具有柔性侧链的刚性棒状骨架聚合物的相结构和转变行为。亚甲基侧链效应对一系列聚酰亚胺结构和分子运动的影响

以3,3 '，4,4 ' -联苯四羧酸二酐(BPDA)和具有不同长度侧链(亚甲基单位数)的二[n-烷基]-4,4 ' -二氨基-6,6 ' -二溴-2,2 ' -联苯二羧酸酯BACBP(n)为原料合成了一系列有机可溶性毛棒状聚酰亚胺。动态力学(DM)结果揭示了bacbp (n > 10)的两个协同弛豫过程，对应于差示扫描量热法(DSC)观察到的两个(低和高)转变温度。对于bacbp (n 10)]和可能的培养基-[对于bacbp (n 10)]采用单斜细胞，而具有短侧链的[bacbp (n≤10)]具有六边形细胞。DM实验中观察到的低弛豫过程和中弛豫过程之间的巨大温差可能是由于侧链长度的变化引起的侧向堆积的变化。bacbp具有有限的迁移率(n≤10)是由于其更有序的构象和相邻侧链之间的交叉。©1999 John Wiley & Sons, Inc高分子材料科学B:高分子材料物理学报，2004,31 (2):393 - 396

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来源期刊

Journal of Polymer Science. Part B, Polymer Physics 工程技术-高分子科学

CiteScore

5.90

自引率

0.00%

发文量

审稿时长

2.1 months

期刊介绍： Since its launch in 1946 by P. M. Doty, H. Mark, and C.C. Price, the Journal of Polymer Science has provided a continuous forum for the dissemination of thoroughly peer-reviewed, fundamental, international research into the preparation and properties of macromolecules. From January 2020, the Journal of Polymer Science, Part A: Polymer Chemistry and Journal of Polymer Science, Part B: Polymer Physics will be published as one journal, the Journal of Polymer Science. The merged journal will reflect the nature of today''s polymer science research, with physics and chemistry of polymer systems at the heart of the scope. You can continue looking forward to an exciting mix of comprehensive reviews, visionary insights, high-impact communications, and full papers that represent the rapid multidisciplinary developments in polymer science. Our editorial team consists of a mix of well-known academic editors and full-time professional editors who ensure fast, professional peer review of your contribution. After publication, our team will work to ensure that your paper receives the recognition it deserves by your peers and the broader scientific community.