Thermal and dynamic mechanical behaviour of calcium containing co-polyurethanes

Prasath, Arun R and Nanjundan, S and Pakula, T and Klapper, M (2004) Thermal and dynamic mechanical behaviour of calcium containing co-polyurethanes. In: Polymer Degradation and Stability, 85 (2). pp. 911-923.

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Abstract

The thermal and dynamic mechanical behaviour of calcium containing co-polyurethanes namely calcium containing poly(urethane-ether)s, poly(urethane-ester)s and poly (urethane-ether-ester)s along with their control co-polyurethanes were studied.The data obtained revealed that the initial decomposition temperature of the calcium containing polymers decreases with increase in calcium content, while the control polymers showed slightly higher IDT than calcium containing polymers. The $T_g$ value of the polymers increases with increase in calcium content and decreases with increase in soft segment content and length. A single $T_g$ is observed for the calcium containing poly(urethane-ether)s based on $PEG_2_0_0$ and calcium containing poly(urethane-ether-ester)s based on $HTPDGP_3_5_6$ for various composition of $Ca(HBP)_2$:$PEG_2_0_0$ or $HTPDGP_3_5_6$:diisocyanate, indicating phase mixing of the soft segment with the ionic species and the hard segment which showed a homogenous phase. In contrast, two $T_gs$ for the calcium containing poly(urethane-ether)s based on $PEG_4_0_0$ and calcium containing poly(urethane-ester)s based on $HTPBG_1_0_0_0$ for various compositions of $Ca(HBP)_2$:$PEG_4_0_0$ or $HTPBG_1_0_0_0$:diisocyanate (HMDI or TDI) show the presence of a heterogeneous phase. The dynamic mechanical analysis of the calcium containing polymers based on HMDI show that with increase in the ionic content of polymer, modulus $g^'$ and $g^"$ increases at any given temperature. The polymers without calcium show lower modulus at any given temperature.

Item Type:	Journal Article
Publication:	Polymer Degradation and Stability
Publisher:	Elsevier Science
Additional Information:	This article copyright belongs to Elsevier Science.
Keywords:	Calcium containing co-polyurethanes;Poly(urethane-ether)s; Poly(urethane-ester)s;Poly(urethane-ether-ester)s;Dynamic mechanical analysis;Thermal analysis;Differential scanning calorimetry
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	23 Jun 2007
Last Modified:	16 Jan 2012 05:09
URI:	http://eprints.iisc.ac.in/id/eprint/11231

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