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Vol. 29 No. 5 (2017): Vol 29 Issue 5

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Thermo-Mechanical Characteristics of Shape Memory Polyurethane Varying Molecular Weight of Polyol

https://doi.org/10.14233/ajchem.2017.20327
Shazia Naheed
Institute of Chemistry, Government College University, Faisalabad-38030, Pakistan
Mohammad Zuber
Institute of Chemistry, Government College University, Faisalabad-38030, Pakistan
Mehdi Barikani
Iran Polymer and Petrochemical Institute, Tehran, Iran
Iftikhar Hussain Bukhari
Institute of Chemistry, Government College University, Faisalabad-38030, Pakistan
Khalid Mahmood Zia
Institute of Chemistry, Government College University, Faisalabad-38030, Pakistan

Corresponding Author(s) : Mohammad Zuber

mohammadzuber@gmail.com

Asian Journal of Chemistry, Vol. 29 No. 5 (2017): Vol 29 Issue 5

Abstract

A series of shape memory polyurethanes (SMPUs) have been prepared from polycaprolactone diol (PCL,`Mn 400, 750, 1000, 1250, 1600, 2000, 3000 and 4000 g mol-1), 1,2-ethanediol (1,2-EDO) and 4,4¢-dicyclohexylmethane diisocyanate (H12MDI). The structural identification of final polymers was confirmed by FT-IR and NMR (1H NMR, 13C NMR) spectroscopy. The thermo-mechanical characteristics was studied using differential scanning calorimeter, thermo-gravimetric analysis, dynamic mechanical thermal analysis and shape memory test by tensile cyclic loading using temperature controlled chamber. The absence of any peak corresponding to functional groups (–OH, –NCO) of monomers in FT-IR spectra confirmed the completion of reaction. The DSC thermograms showed the gradual decrease in the thermal transition with increasing crystallinity, which has been confirmed by dynamic mechanical thermal analysis, with corresponding increase in the molecular weight of macrodiol used as soft segments. The shape recovery of the shape memory polyurethane went up to 90 % and retention up to 79 %. The polymer based on higher molecular weight of polycaprolactone diol (4000 g mol-1) showed better shape memory behaviour than low molecular weight.

Keywords

Thermo-mechanical Polyurethane Polyol Polycaprolactone diol
Naheed, S., Zuber, M., Barikani, M., Bukhari, I. H., & Zia, K. M. (2017). Thermo-Mechanical Characteristics of Shape Memory Polyurethane Varying Molecular Weight of Polyol. Asian Journal of Chemistry, 29(5), 951–959. https://doi.org/10.14233/ajchem.2017.20327
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