Study on strengthening and heat resistance of PBAT composites based on in-situ fiber formation and stereo-composite
Based on the self-built processing equipment for melt blending-high speed hot drawing,the effects of dispersed phase content of polylactic acid(PLA)on the microfiber morphology,the viscoelasticity,and crystallization behavior of poly(adipate-butylene terephthalate)(PBAT)matrix,PLA stereo-composite crystal(sc-PLA),and the mechanical and thermal properties of PBAT/sc-PLA composites were investigated through a combination of in-situ fiber formation and stereo-composite technologies.The results indicated that the PBAT/sc-PLA microfiber composites with a minimum fi-ber diameter of 210 nm could be continuously prepared,and the PLA microfibers were intertangled in the PBAT matrix to form a network structure and also obtained a uniform dispersion.The presence of the sc-PLA microfiber network makes the viscoelastic behavior of the composites change from the"liquid-like"to"solid-like"state.Under the fiber in-duction,the relative crystallinity and crystal content of sc-PLA in the PBAT/sc-PLA composites were significantly in-creased.After adding 30 wt％PLA,the relative crystallinity of sc-PLA in the PBAT/SC-PLA composite reached 46.4％,and its yield strength and elastic modulus were higher than that of pure PBAT by 175.3％and 404％,respec-tively.Their Vica softening temperatures reached nearly 90 ℃.These research results provide a technical means for the large-scale preparation of reinforced and heat-resistant PBAT composites.
in situ fiber formationpolyadipate/butylene terephthalatestereo-composite crystalheat resistancemechanical property
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