Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 56: Issue 3
Polymorphism in Polyamide of Dytek®-A and Dodecanedioic Acid
Authors:
M. Keating DuPont Central Research and Development Experimental Station Wilmington DE 19880 USA Experimental Station Wilmington DE 19880 USA

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K. Gardner DuPont Central Research and Development Experimental Station Wilmington DE 19880 USA Experimental Station Wilmington DE 19880 USA

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H. Ng Research Center, DuPont-Canada Kingston Ontario Canada Kingston Ontario Canada

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D. Marks Wilmington DuPon Nylon DE 19880 USA DE 19880 USA

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W. Yung Wilmington DuPon Nylon DE 19880 USA DE 19880 USA

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P. Avakian DuPont Central Research and Development Experimental Station Wilmington DE 19880 USA Experimental Station Wilmington DE 19880 USA

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H. Starkweather DuPont Central Research and Development Experimental Station Wilmington DE 19880 USA Experimental Station Wilmington DE 19880 USA

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Pages:
1133–1140
Online Publication Date:
16 Aug 2006
Publication Date:
01 Nov 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010105028316
Keywords:
branched diamine; melting; polyamides; polymorphism; transformation; WXRD
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Abstract  

Our X-ray work of Dytek-A, 2-methyl-pentamethylenediamine, containing polyamides shows polymorphism, whereas the polyamides with linear diamines do not. The polyamide of Dytek-A and dodecanedioic acid, MPMD-12, is singled out for discussion and compared with the unbranched analogs of polyamides 6,12 and 5,12. Due to the presence of the -CH3 side group in the 2-position of the diamine, the polyamide MPMD-12 exhibits two stable crystal conformations. The new δ polymorph is not seen in linear polyamides 6,12 and 5,12. Studies by DSC polyamide MPMD-12 clearly illustrates at least two crystal forms, γ and δ, coexisting over a wide temperature range, and the isolation of each phase is possible by controlling temperature and time. The DMA modulus in the temperature region between the glass transition (or alpha relaxation) and melting transition shows strong dependence on the thermal history as demonstrated in a study of crystallization kinetics.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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