Journal ArticleDOI
Low glass transition temperature aliphatic polyurethanes
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TLDR
In this article, the glass transition temperatures of polyurethanes derived from 1,4-butylene and ethylene glycols were determined using dilatometric techniques and they ranged from −12 to −48°C.Abstract:
The present paper deals with the single step syntheses of a few aliphatic polyurethanes using some simple glycols like ethylene, propylene, 1,3- and 1,4-butylene glycols and two different bis(chloromethyl) compounds viz., 1,4-bis(chloromethyl)-2,5-dimethyl benzene (I), and 1,5-bis(chloromethyl)-2,4-dimethyl benzene (II). The glass transition temperatures, Tg, of these polymers were determined using dilatometric techniques and they ranged from −12 to −48°C. The polyurethanes derived from 1,4-butylene and ethylene glycols were amorphous gums with Tg well below −30°C.read more
Citations
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Hydrocolloids: Nova materials assisting encapsulation of volatile phase change materials for cryogenic energy transport and storage
Yan Zhang,Daniele Baiocco,Abdullah Naseer Mustapha,Xiaotong Zhang,Qinghua Yu,Gilmore Wellio,Zhibing Zhang,Yongliang Li +7 more
TL;DR: In this paper, a series of norm-defying hydrocolloid emulsifiers is reported for the challenging task of outstanding long-term retention of volatile cryogenic phase change materials (cryoPCM) in high-payload capsules.
References
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Journal ArticleDOI
Second‐Order Transition Temperatures and Related Properties of Polystyrene. I. Influence of Molecular Weight
Thomas Fox,Paul J. Flory +1 more
TL;DR: In this article, the second-order transition temperature, viscosity-temperature coefficient, and specific volume of fractionated polystyrenes containing diethylbenzene end groups are presented over wide temperature ranges.
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Infrared studies on segmented polyurethane-urea elastomers
TL;DR: In this paper, structural studies on hydrogen bonding in segmented polyurethane-urea elastomers were made using IR spectroscopy, and the orientation behavior of both the hard and soft segments on deformation was investigated using IR dichroism measurements.
Journal ArticleDOI
The interpretation of transition phenomena in polymethylene terephthalate polymers
G. Farrow,J. McIntosh,I. M. Ward +2 more
TL;DR: In this paper, a series of polymethylene terephthalate polymers have been investigated by measurement of dynamic mechanical properties, nuclear magnetic resonance spectra, infra-red spectra and X-ray diffraction.
Journal ArticleDOI
Thermal expansion measurements and transition temperatures, first and second order
TL;DR: In this article, expansion curves for several polyolefin materials are presented which illustrate changes in Tm and in the low temperature expansion coefficient with changes in the structure of the polymer, indicating the possibility of additional second-order transitions.
Journal ArticleDOI
Perfluoroalkylene‐linked aromatic polyimides. II. Further property studies
J. P. Critchley,Mary A. White +1 more
TL;DR: In this article, the physicochemical properties of perfluoroalkylene-linked aromatic polyimides are compared with those of certain wholly aromatic polyIMides, including di-(4-aminophenyl) ether and 1,3-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride.