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Study on Modification of PHBV and Preliminary Exploration in Preparation of PHBV/PBAT Melt-Blown Nonwoven

Author: ZuoRuiJun
Tutor: ChenYanMo
School: Donghua University
Course: Biomimetic materials
Keywords: PHBV PBAT Crystallization Rheology Meltblown
CLC: TS174
Type: Master's thesis
Year: 2010
Downloads: 262
Quote: 2
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Abstract

Hydroxy-butyric acid - hydroxyvalerate the copolyester (PHBV) a thermoplastic biopolymer polyester is synthesized by microbial fermentation and having a good biological degradability, biological tissue compatibility and anticoagulant in industry, agriculture, packaging, , biomedical and other fields has a broad application prospects. It is a rich source of raw materials and does not require complex polymerization process equipment, general-purpose resins alternatives, thus great deal of attention in recent years by many domestic and foreign research workers. PHBV fibers prepared by melt spinning, the presence of the fibers brittle hair, and the fiber strength and low, seriously hindered the practical application of the PHBV fibers, and these defects are due to the nature of the PHBV material itself determined. The material of poor thermal stability, the window is very narrow melt-spinning temperature of the melt, in a melt spinning process in severe thermal degradation, resulting in the significant decline in its molecular weight, thus affecting the strength and other mechanical properties of the fiber. Ecoflex is PBAT is a novel biological manufactured by BASF Corporation of biodegradable polyesters, the monomer composition of terephthalic acid, fatty acid and 1,4 - butanediol, often used with other biological Degradation of the polymer blend in order to improve its workability. In order to improve the PHBV these defects and improve the spinnability, the paper PBAT, PHBV melt blending want to improve the of PHBV inherent performance deficiencies and exploration of research PHBV / PBAT blending, was meltblown nonwoven in the application. Our group is in the process of research PHBV blends modified PBAT can change PHBV crystalline form read PHBV / PBAT blends relatively the pure PHBV wider processing window, broaden its melt spinnability. ~ 1H NMR, GPC and ash assay test the PHBV basic parameters. GPC before the experiment, two different purification methods reported in the literature PHBV purified one is chloroform as a solvent using a Soxhlet extractor for purification; another using chloroform as the solvent, n-hexane to precipitate the purification agent. The experimental results showed that the different the purification way to get the PHBV molecular weight have a certain gap. 2 DSC, infrared spectroscopy, wide-angle X-ray diffraction and hot stage polarizing microscope different proportions of PHBV / PBAT blends crystallization performance measurement. With the PBAT content increases PHBV / PBAT blending, in PHBV spherulite size becomes small, the crystallization rate decreases, while PHBV / PBAT blends from the PHBV single crystallization peak Evolution of the high-temperature and low-temperature two a crystallization peak, when the the PBAT content exceeds 30%, the two crystalline peaks into separate high-temperature crystallization peak which also shows the The PBAT play the role of a nucleating agent, there are more smaller size of the spherulites formed in the polymer; PHBV / PBAT blends degree of crystallinity with PBAT increases and decreases. The PHBV PBAT and PHBV / PBAT (50/50) blend of the rheological properties of the test found PHBV / PBAT (50/50) blend of viscous flow activation energy of less than pure PHBV and pure PBAT has excellent thermal stability, broadening the melt-spinning temperature window. PHBV / PBAT (50/50) blend Explore the meltblown nonwoven fabric was prepared experiment. Found after the meltblown nonwoven fabric of PHBV / PBAT (50/50), the mechanical strength, the aperture ratio, the contact angle and the antibacterial performance test, PHBV / PBAT (50/50) of the meltblown nonwoven fabric mechanical strength is not very ideal; PHBV / PBAT (50/50) the meltblown nonwoven demonstrated repellent, water and oil repellent material; the meltblown nonwoven PHBV / PBAT (50/50) without antimicrobial treatment conditions in antibacterial performance test showed some antibacterial, bacteriostatic against Staphylococcus aureus rate of 49.55%, but 70% of the standard did not meet the national standard antibacterial.

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