Investigation of the thermal self-healing mechanism in a cross-linked epoxy system
摘要:
我们研究了一种基于双酚 A 的二缩水甘油醚(DGEBA)和一种具有两种 Diels-Alder (DA) 加合物的新型二胺交联剂的交联环氧体系的自愈合机理。DA 加合物位于二胺上,这意味着交联剂是可以热裂解和重塑的结构元素,从而使交联聚合物能够流动,填充或愈合裂缝和划痕。由于打开交联网络以允许流动和愈合的刺激因素是热量,因此原始网络固化的温度也成为一个重要的变量,在这项工作中,我们探索了不同的固化条件,以找到合适的固化条件,既能使环氧胺发生反应,又能避免 DA 加合物的初始裂解。通过跟踪裂解对一系列特性的影响,如加成物的化学性质、聚合物网络的玻璃化转变、裂解时网络分裂成的单元大小以及网络的膨胀能力,对固化样品的热自愈合机制进行了研究。此外,还研究了愈合微米级表面划痕所需的适当条件。
An efficient reverse Diels–Alder approach for the synthesis of N-alkyl bismaleimides
摘要:
Bismaleimides are useful precursors for Diels-Alder reactions, Michael additions, and thiol-maleimide based conjugation for the synthesis of materials and polymers. Use of bismaleimide cross linkers for generating polymers, bioconjugate molecules, and useful imaging molecules is an active area of research. An efficient and practical synthetic protocol for N-alkyl bis-maleimide cross linkers starting from furan protected maleimide employing a reverse Diels-Alder reaction is reported. (C) 2013 Elsevier Ltd. All rights reserved.
A new class of bradykinin antagonists: synthesis and in vitro activity of bissuccinimidoalkane peptide dimers
作者:John C. Cheronis、Eric T. Whalley、Khe T. Nguyen、Shad R. Eubanks、Lisa G. Allen、Matthew J. Duggan、Sharon D. Loy、Kathryn A. Bonham、James K. Blodgett
DOI:10.1021/jm00087a010
日期:1992.5
potency. Rank order of antagonist potency as a function of dimerization position is as follows: rat uterus, 6 greater than 5 greater than 0 greater than 2 greater than 1 greater than 3 much greater than 4, 7, 8, 9; guinea pig ileum, 6 greater than 5 greater than 3 greater than 2 greater than 1 greater than 0 much greater than 4, 7, 8, 9. Evaluation of the linker length as represented by the number of methylene
A composition includes a reversible polymer material, which can reversibly transition between a liquid state and a solid state by reversible cycloaddition reactions, wherein upon cooling, the reversible polymer material transitions from a liquid state to a solid state by reversible cycloaddition reactions within a time period of less than about 10 seconds.
Effect of spacer chemistry on the formation and properties of linear reversible polymers
作者:James D. Mayo、Alex Adronov
DOI:10.1002/pola.26937
日期:2013.12.1
A series of four pairs of bismaleimide and bisfuran monomers were combined to make thermally reversiblelinearpolymers. The monomers were prepared using diamines having different spacerchemistries, n‐octyl, cyclohexyl, phenyl, and ethylenedioxy, such that a relatively constant spacer dimension among the four monomers was achieved. Heating of the bismaleimide/bisfuran couples resulted in low‐viscosity
COMPOSITION FOR FORMING OPTICAL COMPONENT, OPTICAL COMPONENT, COMPOUND, AND RESIN
申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:US20210309595A1
公开(公告)日:2021-10-07
Provided is a composition containing a polyphenol compound (B) and a solvent, in which the polyphenol compound (B) is at least one selected from a compound represented by the following formula (1) and a resin having a structure represented by the following formula (2):
wherein R
Y
, R
T
, X, m, N, r, and L are as described in the description.
An ink jettable underprint composition includes a reversible polymer material, which can reversibly transition between a liquid state and a solid state by reversible cycloaddition reactions, wherein upon cooling, the reversible polymer material transitions from a liquid state to a solid state by reversible cycloaddition reactions within a time period of less than about 10 seconds.