Nonlinear determination of the equilibrium melting temperature from initial nonreorganized crystals of poly(3-hydroxybutyrate)

被引：7

作者：

Righetti, Maria Cristina ^{[1
]}

Di Lorenzo, Maria Laura ^{[2
]}

机构：

[1] Ist Proc Chim Fis, Consiglio Nazl Ric, I-56124 Pisa, Italy

[2] Ist Chim & Tecnol Polimeri, Consiglio Nazl Ric, I-80078 Pozzuoli, NA, Italy

来源：

POLYMER ENGINEERING AND SCIENCE | 2012年 / 52卷 / 11期

关键词：

RIGID AMORPHOUS FRACTION; CRYSTALLIZATION KINETICS; ISOTHERMAL CRYSTALLIZATION; ISOTACTIC POLYSTYRENE; POLYMER CRYSTALS; SINGLE-CRYSTAL; GROWTH-RATE; BEHAVIOR; POLY(BETA-HYDROXYBUTYRATE); MORPHOLOGY;

D O I：

10.1002/pen.23199

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this article a procedure for the determination of the equilibrium melting temperature (T?m0) of polymers whose crystals reorganize during heating with a melting/recrystallization mechanism is presented and discussed. The procedure is completely based on data obtained by calorimetry and does not require measurements with nonroutine techniques. From the extrapolated melting temperatures of initial nonreorganized crystals, the T?m0 of poly(3-hydroxybutyrate) is calculated through the Thomson-Gibbs equation via a nonlinear regression method. The value of T?m0 here determined (511 K) is higher than previous data obtained with the commonly used Hoffman-Weeks procedure, which confirms that the latter method provides an underestimation of the equilibrium melting point, similar to the data reported for a number of other semicrystalline polymers. POLYM. ENG. SCI., 2012. (C) 2012 Society of Plastics Engineers

引用

页码：2383 / 2390

页数：8

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