材料科学
差示扫描量热法
固化(化学)
聚氨酯
傅里叶变换红外光谱
扫描电子显微镜
乙二醇
乳酸
高分子化学
PEG比率
聚乙二醇
化学工程
复合材料
物理
遗传学
生物
细菌
工程类
热力学
财务
经济
作者
Débora E. O. Almeida,Ananda Karoline Camelo de Albuquerque,Ingridy Dayane dos Santos Silva,Andreas Ries,Renate Maria Ramos Wellen
摘要
Abstract The effect of poly(lactic acid) (PLA) content on the curing of polyethylene glycol (PEG) based polyurethanes (PU) was investigated. Aiming to produce biobased PU foams, pentamethylene diisocyanate (PDI) was used. Fourier transform infrared spectroscopy (FTIR) found no curing evidence at 30°C and verified that the curing was completed at 300°C. This method tracks hydrogen bonding and NCO consumption. PLA addition decreased the curing rate as evidenced through differential scanning calorimetry (DSC) and promoted changes in the released heat which is linked to chemical and physical crosslinking. Complex peaks were verified in DSC scans whereas the peak at lower temperatures is related to the catalyzed curing while that in the higher ones is due to the homopolymerization. PU foams morphology was investigated using scanning electron microscopy (SEM). Pores and cell sizes are related to PLA content and hydrogen bonding.
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