Structure and biocompatibility of highly oriented poly(lactic acid) film produced by biaxial solid hot stretching

[Display omitted] Highly oriented long-chain-branched poly(lactic acid) (LCB-PLA) film was fabricated through biaxial hot stretching in solid state. Compared with neat PLA, more homogeneous film with higher draw ratio can be obtained for LCB-PLA. With increasing draw ratio, the long period, lamellae thickness and grain size of LCB-PLA decreased, while the crystallinity increased. For LCB-PLA with draw ratio of 6*6, the tensile strength and elongation at break can reach up to 208±6MPa and 85% respectively. After drawing, the increasing content of CH3 and CO group on the surface of LCB-PLA film was beneficial for cell adhesion and growth on it.