ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Michael additions of the secondary diamines N,N′-dimethyl-1,6-hexanediamine (14) or piperazine to the electrophilic carbon-carbon double bonds of N,N′-bismaleimido-4,4′-diphenylmethane (2) or N,N′-bismaleimido-1,8-octane (4) afford four unusual, high-molecular-weight (ηinh = 0.49-2.16 dL/g) polyimides (10-13). The most interesting of these, polymer 12 (the product of 4 and 14), is a tough elastomeric resin with a glass transition temperature (Tg) near 0°C; in contrast, 10, 11, and 13 exhibit Tg 〉86°C. Freshly prepared 12 is soluble and thermoplastic (12 is readily compression molded at 110°C), but the bulk polymer crosslinks slowly under ambient laboratory conditions and eventually (48 days) becomes insoluble, while 10, 11, and 13 remain soluble indefinitely. Along with further comparisons of the properties of 10-13, details of the synthesis and characterization of these new polyimides are described. Also discussed are reactions of bismaleimide 2 with 1,6-diaminohexane, which unlike the formation of linear 10-13, generate crosslinked, insoluble products.
Additional Material:
3 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1984.070290317
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