Studies on Spherulitic Morphology and Crystallization Kinetics of Poly (3-hydroxybutyrate) Blended with a Medium-Molecular-Weight Poly (Ethylene Oxide)

doi:10.6180/jase.2006.9.3.10

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Title:	Studies on Spherulitic Morphology and Crystallization Kinetics of Poly (3-hydroxybutyrate) Blended with a Medium-Molecular-Weight Poly (Ethylene Oxide)
Authors:	董崇民;Don, Trong-ming;Chen, Pi-che;Shang, Wei-wei;Chiu, Hsiu-jung
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	Poly(3-hydroxybutyrate);Poly(ethylene oxide);Blends;Spherulite
Date:	2006-09-01
Issue Date:	2010-03-09 10:17:02 (UTC+8)
Publisher:	臺北縣：淡江大學
Abstract:	Spherulitic morphology and crystallization kinetics of poly(ethylene oxide)/poly(3-hydroxybutyrate) blends, PEO/P(3HB), were investigated using differential scanning calorimeter (DSC), polarized optical microscope (POM) and scanning electronic microscope (SEM). A single glass transition temperature was observed for all the blends and the Gordon-Taylor equation follows the Tg-composition dependence very well. Furthermore, the melting point of P(3HB) was depressed by the addition of PEO component and from which the interaction parameter 12 was calculated to be -0.059 using the Nishi-Wang equation. Thus, it can be concluded that P(3HB) and PEO are miscible in the level of molecular mixing. From POM and SEM observations, P(3HB) spherulites exhibit a banded texture due to the twisting of lamellar crystals. The band spacing is almost a constant, ca. 20 m, when the crystallization temperature is below 90 C, at which the maximum growth rate of P(3HB) spherulites occurs. When P(3HB) is blended with PEO, the growth rate of P(3HB) spherulites decreases because of the dilution effect and a decrease in the degree of undercooling. According to the polymer-diluent theory, the nucleation factor Kg and the folded surface free energy e of P(3HB) crystals are calculated to be 5.648 105 K2 and 47.2 erg/cm2, respectively. Both values decrease when PEO is added.
Relation:	淡江理工學刊=Tamkang journal of science and engineering 9(3), pp.279-290
DOI:	10.6180/jase.2006.9.3.10
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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