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	<title> &#187; 聚酰亚胺的分类</title>
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		<title>聚酰亚胺的分类</title>
		<link>https://www.dabco.org/archives/4760</link>
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		<pubDate>Fri, 12 Apr 2024 03:08:33 +0000</pubDate>
		<dc:creator><![CDATA[聚氨酯催化剂]]></dc:creator>
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		<category><![CDATA[聚酰亚胺的分类]]></category>

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		<description><![CDATA[由于缩聚型聚酰亚胺具有如上所述的缺点，为克服这些缺点，相继开发出了加聚型聚酰亚胺。获得广泛应用的主要有聚双马来酰亚胺和降冰片烯基封端聚酰亚胺。通常这些树脂都是端部带有不饱和基团的低相对分子质量聚酰亚胺，应用时再通过不饱和端基进行聚合。 ①聚双马来酰亚胺 聚双马来酰亚胺是由顺丁烯二酸酐和芳香族二胺缩聚而成的。它与聚酰亚胺 ...]]></description>
				<content:encoded><![CDATA[<h3>由于缩聚型聚酰亚胺具有如上所述的缺点，为克服这些缺点，相继开发出了加聚型聚酰亚胺。获得广泛应用的主要有聚双马来酰亚胺和降冰片烯基封端聚酰亚胺。通常这些树脂都是端部带有不饱和基团的低相对分子质量聚酰亚胺，应用时再通过不饱和端基进行聚合。<br />
①聚双马来酰亚胺<br />
聚双马来酰亚胺是由顺丁烯二酸酐和芳香族二胺缩聚而成的。它与聚酰亚胺相比，性能不差上下，但合成工艺简单，后加工容易，成本低，可以方便地制成各种复合材料制品。但固化物较脆。<br />
②降冰片烯基封端聚酰亚胺树脂<br />
其中重要的是由nasa lewis研究中心发展的一类pmr（for insitu polymerization of monomer reactants, 单体反应物就地聚合）型聚酰亚胺树脂。rmr型聚酰亚胺树脂是将芳香族四羧酸的二烷基酯、芳香族二元胺和5-降冰片烯-2，3-二羧酸的单烷基酯等单体溶解在一种尝基醇（例如甲醇或乙醇）中，为种溶液可直接用于浸渍纤维。 聚酰亚胺是分子结构含有酰亚胺基链节的芳杂环高分子化合物，英文名polyimide(简称pi)，可分为均型pi，可溶性pi，聚酰胺-酰亚胺（pai）和聚醚亚胺（pei）四类。</h3>
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