Authors: Sulaiman, S. F.¹; Chan, C. H.²; Harun, M. K.¹

Source: Materials Research Innovations, Volume 13, Number 3, September 2009 , pp. 225-228(4)

Publisher: Maney Publishing

Abstract:

Thermal properties and morphologies for polymer blends of poly(ethylene terephthalate) (PET) and epoxidised natural rubber with 25 mol.-% (ENR-25) and 50 mol.-% (ENR-50) epoxy contents were studied using differential scanning calorimeter (DSC) and polarising optical microscope (POM) respectively. The blends were prepared by precipitation method. Immiscibility of the components is revealed by observation of two glass transition temperatures T_g that correspond to that of the neat constituents. Equilibrium melting points T^o_m of PET in blends was determined by applying Hoffman–Weeks stepwise annealing procedure. The degree of crystallinity of PET in blends with ENR-25 remains constant, whereas the authors observe an increase in the degree in blends with ENR-50. The rate of crystallisation of PET in blends is characterised by the reciprocal halftime t^–1_0·5. It displays an Arrhenius-like behaviour with respect to temperature and it stays constant at isothermal crystallisation temperature (T_c=constant) as long as PET is in excess. Rate of crystallisation of PET in the blends decreases exponentially as the T_c increases. Dispersed phases of ENR-25 and ENR-50 in the matrix of PET can be observed when the content of PET is in excess.

Keywords: POLY(ETHYLENE TEREPHTHALATE); EPOXIDISED NATURAL RUBBER; ISOTHERMAL CRYSTALLISATION; MELTING BEHAVIOUR; GLASS TRANSITION TEMPERATURE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/143307509X440361

Affiliations: 1: Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Malaysia 2: Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Malaysia;, Email: cchan@salam.uitm.edu.my

Publication date: 2009-09-01

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