ISSN:
0449-2951
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Polyamides of both cis- and trans-1,4-cyclohexanebis(methylamine) with aliphatic dicarboxylic acids and copolyamides of trans-1,4-cyclohexanebis(methylamine) with p-xylene-α,α′-diamine were prepared in order to discover the effect of cycloalkane rings on melting point. Analogous polyamides of p-xylene-α,α′-diamine were prepared for comparison. The polyamides of trans-1,4-cyclohexanebis(methylamine) had higher melting points than the analogous polyamides of p-xylene-α,α′-diamine. This result is believed to be due to the slightly contracted conformation which trans-1,4-cyclohexanebis(methylamine) can adopt in the polymer chain. The polyamides of cis-1,4-cyclohexanebis(methylamine) melted lower than those of the trans isomer. The lower symmetry of the cis-diamine accounts for this result. The melting points of the copolyamides of trans-1,4-cyclohexanebis(methylamine) and p-xylene-α,α′-diamine were higher than expected. It is suggested that these compositions are examples of partially isomorphous copolyamides.
Zusätzliches Material:
6 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pol.1965.100030103
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