http://hip.sagepub.com/cgi/content/abstract/7/1/23

Synthesis and properties of aromatic polyimides containing oxyalkylene linkages

Mark W Beltz
Frank W Harris

The Maurice Morton Institute of Polymer Science, The University of Akron, Akron,
OH 44325-3909, USA

A series of para-catenated aromatic diamines containing oxyalkylene linkages,
i.e., i.2-bis(4-aminophenoxy)ethane, bis[2-(4-aminnophenoxy)ethyl]ether, 1,
2-bis[24{4-aminio-phenoxy)ethoxyjethane and bis{2-[2A4-aminophenoxy)ethoxy]
ethyllether were polymerized with 3,3',4.4'benzophenonetetracarboxylic
dianhydride (BTDA) and pyromellitic dianhydride. The poly(amic acid)s obtained
were imidized by both chemical and thermal methods. It was postulated that the
incorporation of the flexible linkages in the polyimides' backbones would
result in solubility in organic solvents and moderate glass transition
temperatures (Tg) that would allow the polymers to be melt processed. However,
the polyimides were insoluble and highly crystalline with melting points (Tm)

感谢
--
FROM 219.234.148.*