采用溶液共混法制备了不同质量分数的笼形氯化氨丙基聚倍半硅氧烷/聚乳酸(OCAPS/PLLA)杂化材料.扫描电镜和能量色散X射线分析仪研究表明,OCAPS在PLLA基体中具有良好的相容性和分散性.利用差示扫描量热仪(DSC)和X射线衍射仪(XRD)对该体系的冷结晶及熔融行为进行了研究.结果表明,OCAPS不会改变PLLA基体结晶的α晶型,但具有异相成核作用,降低了PLLA基体的冷结晶温度;随着升温速率的降低,由于晶粒熔融重结晶导致PLLA基体熔融单峰分裂成为双峰,并且OCAPS促进了PLLA的熔融重结晶过程,使晶粒结构更加完善.
Cage-like octa(γ-chloroammoniumpropyl) polyhedral oligomeric silsesquioxane/polylactide (OCAPS/PLLA) hybrid materials were prepared via solution blending method. SEM(scanning electronic microscopy) and EELS (energy dispersive X-ray spectroscopy) analysis show that OCAPS has good miscibility and dispersion in PLLA matrix.The cold crystallization and melting behavior of the hybrid systems were characterized by DSC(differential scanning calorimetry) and XRD(X-ray diffraction) measurements. The results show that the addition of OCAPS does not change the crystalline structure of PLLA, while T_c of PLLA decreases due to OCAPS's nucleation effect. Moreover,the double melting behavior is attributable to recrystallization of defective crystalline grains,and OCAPS also promotes recrystallization which results in more perfect crystalline structure.
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