Isothermal crystallization kinetics of poly(butylene terephthalate‐co‐sebacate) copolymer

Abstract

Poly(butylene terephalate) (PBT) and poly(butylene terephthalate-co-sebacate) (PBTS) copolymers containing 5 mol % and 10 mol % sebacate components (M n ¼ 12,700-14,600) were synthesized by polycondensation. The isothermal crystallization kinetics and melting behaviors after isothermal crystallization of the polymers were investigated by differential scanning calorimetry (DSC). The equilibrium melting temperatures of the polymers were determined by Hoffman-Weeks equation. Analysis of the crystallization kinetic data using the Avrami equation showed that the introduction of sebacate enhanced the crystallization of PBT in PBTS. And the Avrami exponent n varies in the range of 2.16-3.68, indicating that the isothermal crystallization follows two-and three-dimensional growth mechanism. The isothermal crystallization activation energies of the polymers were also calculated by the Arrhenius equation. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: [735][736][737][738][739][740][741][742] 2011

Isothermal crystallization kinetics and melting behaviors of poly(butylene terephthalate) and poly(butylene terephthalate‐co‐fumarate) copolymer

“…The results of T for these polymers are tabulated in Table 2. In the literature, the T of PBT has been investigated to be 229.2°C [17], 233°C [2], and 236°C [11, 12, 19] which are close to our present data, 230.1°C. Figure 4 plots T of the copolyesters versus the composition in PBTF.…”

“…In fact, the crystallization behavior and the crystallinity of copolymers are strongly influenced by composition, kind, and distribution of the comonomeric units along the chain. Previous studies [16–23] mainly focused on introducing different saturated dicarboxylic acids or diols into the chain of PBT to change the crystallization behaviors of copolymers. On the other hand, the unsaturated bonds offer sites for further crosslinking reactions which lead to polymers with improved mechanical properties.…”

Study on toughening of poly(4-methyl-1-pentene) with various thermoplastic elastomers

“…The value of ÁH Ã f for PMP is 117.2 J g À1 . 28 The calculated data are listed in Table 1. As anticipated, the crystallinity of PMP/SBS blends is the lowest no matter whether in 5% or 10% mass fraction also because of the poor compatibility between SBS and PMP.…”

Improvement of thermal stability, crystallinity and degradation of poly(butylene carbonate) by incorporation of bio‐based poly(ethylene sebacate) segment

“…However, from our results, the overall crystallization rate did not decrease, but increase considerably. Therefore, the increase in crystallization rate could only be ascribed to the improvement in nucleation efficiency by incorporation of the PESe segment …”