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Title: Studies of Silicon-Containing Bismaleimide Resins. Part I: Synthesis and Characteristics of Model Compounds and Polyaspartimides
Authors: 疏偉傑
Shu, Wei-Jye
Tsai, Ruey-Shi
Keywords: Silicon-containing bismaleimide resins
reactive flame-retardants
focused microwave irradiation
Date: 2010
Issue Date: 2014-12-29 13:24:46 (UTC+8)
Abstract: A series of silicon-containing bismaleimide ((4,4-bismaleimido phenoxy) silane, BMI) monomers has been synthesized by a two-step reaction for use as flame retardant or modifier of general resins. The synthesized BMI monomers are characterized by the 1H-, 13C- and 29Si-NMR spectroscopy and element analysis. These BMI monomers were reacted with free radical initiator to prepare silicon-containing BMI polymers and also with various aromatic diamines to prepare a series of polyaspartimides as reactive flame-retardants by focused
microwave irradiation. The polymerization degrees of polyaspartimides depend on the alkalinity and nucleophility of diamines as chain extenders. Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) have been used to study the thermal properties of all the BMI resins such as the melting temperature, curing temperature, glass transition temperature (Tg) and thermal resistance. All the silicon-containing BMI resins, except BMI polymers, have a Tg in the range of 155–162◦C and 5% weight loss temperatures (T5%) of 361–380◦C and 358–377◦C in air and nitrogen atmosphere, respectively. The higher heat resistance of cured BMI resin relative to BMI polymer is due to its higher cross-linking density.
Since the re-cross-linking reactions of BMI polymers and polyaspartimides occur more easily in the oxidation environment, their thermal stabilities in air are higher than those in nitrogen gas. In addition, thermal decomposition properties of polyaspartimides depend on their structures and compositions of both diamine segments and BMI segments.
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