English  |  正體中文  |  简体中文  |  Items with full text/Total items : 330/331
Visitors : 3765453      Online Users : 23
RC Version 5.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item: http://mitustr.lib.mitust.edu.tw:8080/ir/handle/987654321/1109

Title: Studies of Phosphonate-Containing Bismaleimide Resins. I. Synthesis and Characteristics of Model Compounds and Polyaspartimides
Authors: 疏偉傑
Shu, Wei-Jye
Perng, Li-Hsiang
Chin, Wei-Kuo
Keywords: phosphonate-containing bismaleimide resins
thermal resistance
Date: 2000-12
Issue Date: 2014-12-29 15:17:40 (UTC+8)
Abstract: Two phosphonate-containing bismaleimide (BMI) [(4,4-bismaleimidophenyl)phosphonate] monomers with different melting temperatures and similar curing temperatures were synthesized by reacting N-hydroxyphenylmaleimide with two kinds of dichloride-terminated phosphonic monomers. The BMI monomers synthesized were identified with 1H-, 13C-, and 31P-nuclear magnetic resonance (NMR) spectroscopy and elemental analysis. The phosphonate-containing BMI monomers react with a freeradical initiator to prepare phosphonate-containing BMI polymers and also with various aromatic diamines to prepare a series of polyaspartimides as reactive flame retardants. The polymerization degrees of polyaspartimides depend on the alkalinity and nucleophility of diamines as chain extenders. Differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA) were used to study the thermal properties of the phosphonate-containing BMI resins such as the melting temperature, curing temperature,glass transition temperature (Tg), and thermal resistance. All the phosphonatecontaining
BMI resins, except the BMI polymers, have a Tg in the range of 210–256°C and show 5% weight loss temperatures (T5%) of 329 434 and 310–388°C in air and nitrogen atmospheres, respectively. The higher heat resistance of cured BMI resin relative to the BMI polymer is due to its higher crosslinking density. Since the recrosslinking reactions of BMI polymers and polyaspartimides occur more easily in an oxidation environment, their thermal stabilities in air are higher than are those in nitrogen gas. In addition, the thermal decomposition properties of polyaspartimides depend on the structures and compositions of both the diamine segments and the BMI segments.
Appears in Collections:[生活應用科技系] 專書、期刊論文或研討會議論文

Files in This Item:

File Description SizeFormat
JAPS-1.pdf282KbAdobe PDF1428View/Open

All items in MITUSTIR are protected by copyright, with all rights reserved.


DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback