本文選題：熱塑性聚氨酯　切入點：聚乳酸　出處：《復(fù)合材料學(xué)報》2017年09期

【摘要】：通過熔融共混擠出法制備不同質(zhì)量比的熱塑性聚氨酯-聚乳酸(TPU-PLA)共混物,采用SEM、DSC、TG、微卡軟化點溫度測定儀和熔融流動速率儀對共混物的表面形態(tài)結(jié)構(gòu)、熱學(xué)、高溫加工等性能進(jìn)行研究。結(jié)果表明:TPU-PLA共混物表面光滑且呈現(xiàn)出脆性斷裂形貌特征,共混體系兩種高聚物呈"海島"分布;TPU-PLA共混體系中PLA與單獨PLA相比,玻璃化轉(zhuǎn)變溫度Tg由69.60℃(Original PLA)變?yōu)?7.58℃(PLA70)、53.29℃(PLA50)和55.64℃(PLA30),TPU均勻分散于PLA基體中且相界面分明,這都說明TPU-PLA共混體系為部分相容體系;TPU-PLA共混物的熱失重起始分解溫度范圍為180~200℃,最快分解溫度范圍為310~350℃,熱穩(wěn)定性良好;TPU含量占共混物10%~30%時,共混物高溫的臨界變形溫度相對單一體系有所提高;隨TPU含量的繼續(xù)增加,共混物熔融指數(shù)呈現(xiàn)先增大后減小的變化趨勢,其中PLA與TPU質(zhì)量比為4∶6的TPU-PLA共混物熔融指數(shù)達(dá)到最大,為1 406g·(10min)-1。
[Abstract]:Thermoplastic polyurethane / poly (lactic acid) TPU-PLA blends with different mass ratios were prepared by melt blending extrusion method. The surface morphology and thermal properties of the blends were investigated by means of SEMMA-DSC-TG, microcalorie softening point temperature analyzer and melt flow rate instrument.High temperature processing and other properties are studied.The results showed that the surface of the blend was smooth and the morphology of brittle fracture was observed. The PLA of the blend was "island" distributed and compared with that of the single PLA.The fastest decomposition temperature range is 310 ~ 350 鈩，

本文編號：1701218