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Study on Blends of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/Hyperbranched Polyesteramidesand (HBPEA) and Its Fiber Spinnability

Author: ShiShengJie
Tutor: ChenYanMo
School: Donghua University
Course: Biomimetic materials
Keywords: Copolyesters , polyhydroxybutyrate valerate (PHBV ) Hyperbranched polyester Blends Spinnability Mechanical Properties
CLC: TQ340.1
Type: Master's thesis
Year: 2010
Downloads: 89
Quote: 0
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Abstract


Copolyester polyhydroxybutyrate valerate (PHBV) is a bio-polymer polyester, it has an excellent biocompatibility, bio-degradable and bioabsorbable, however, due to the shortcomings of the material itself, such as the slow crystallization rate, poor thermal stability, easily hydrolyzed, viscosity, and molding difficulties, greatly limit the application of PHBV, therefore blending methods modified PHBV is currently one of the hot. Used herein hyperbranched polyamides in ester (HBPEA) as blend additives, in the study of the basic properties of each of the blend components of the the PHBV / HBPEA system, but also on the thermal performance of the blend system, the crystalline properties, rheological behavior, spinnability performance and reasonable the PHBV / HBPEA fiber forming process conditions, with certain mechanical properties the PHBV / HBPEA blend fibers were successfully prepared in the laboratory. First, we discuss the basic performance of the two blend components: PHBV moisture content must be strictly controlled in order to reduce the degree of hydrolysis in the blending process and the melt-spinning process; determined the PHBV / HBPEA melt spinning temperature window; Hyperbranched polyesteramide initial degradation temperature is greater than the above-described the PHBV temperature of area; hyperbranched polyamide esters have good solubility in polar solvents such as alcohols, ketones, tetrahydrofuran, to provide a basis for the structural performance characterization . Blending modification mechanism: spherical HBPEA molecules in PHBV chain-like molecules, so the PHBV / HBPEA blends viscosity than pure PHBV declined; HBPEA stearic acid end groups at the same time in the blends acts as a lubricant role; HBPEA the existence of many rigid chain of benzene rings, will improve the mechanical properties of the blends. Then study the basic properties of the blends: the hyperbranched polyester HBPEA add to the PHBV significant improvement in high HV content in the PHBV the processing performance. In its crystal structure and crystallization kinetics, the hyperbranched polyester changed blends mechanism of nucleation (heterogeneous nucleation), into auditing and grain size, the degree of crystallinity of the blends increased slightly. ; blend scanning electron micrograph observation found that the hyperbranched polyester is uniformly dispersed in the blend system; hyperbranched polyester added to reduce the apparent viscosity of the PHBV, metblown molding temperature zone can be decreased. Blends hyperbranched polyester add volume and forming temperature processing blends great to strictly control the processing temperature, determine appropriate hyperbranched polyester add. In this work, to SiO 2 parallel experiments at the same time, as a contrast. Blends spinnability, especially hyperbranched additive content, storage time, melt spinning temperature, draw ratio, and sliced ??dry parameters of the system of exploration. The results show that the adding of the hyperbranched polyester, to reduce the viscosity of the system, so that the blend fibers forming becomes feasible through the adjustment and optimization of a series of spinning process conditions in the laboratory can be continuously prepared having good mechanical properties The the PHBV / HBPEA blend fibers, and then expand the road PHBV fibers.

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