Journal
POLYMER DEGRADATION AND STABILITY
Volume 129, Issue -, Pages 328-337Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2016.05.010
Keywords
Poly(lactide); Blown film; Anisotropic property; Notch sensitivity; Morphology
Categories
Funding
- LANXESS Chemical (China) Co., Ltd.
- National Natural Science Foundation of China [51303067, 51573074]
- Natural Science Foundation of Jiangsu Province [BK20130147]
- Fundamental Research Funds for the Central Universities [JUSRP51624A]
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The application range of poly(lactide), PLA, films is limited due to the brittleness and notch-sensitivity. In this work, thin films with balanced properties were fabricated by melt blowing of PLA and poly(ethylene-co-vinyl acetate) (EVA) blends. The film thickness is dependent on the taken-up speed and reached to around 10 mu m at the taken-up speed over 14 m/min. The presence of EVA not only significantly enhanced the tensile toughness and notch-resistance of the PLA films but also retained high transmittance. The films exhibited anisotropic mechanical performances which were correlated to the micro-morphology differences between the take-up direction (DD) and the transversal direction (TD) as characterized by atomic force microscope. In addition, the EVA with 80 wt% VA units showed better overall modification effect on the PLA films than the EVA with 60 wt% VA units. Superior mechanical properties of PLA/EVA (80/20) blends such as tensile strength of 50-60 MPa, elongation at break up to 230% and tear strength of 85 kN/m were achieved in the DD direction. Meanwhile, balanced properties were also achieved in TD direction. Moreover, a transmittance of around 90% was obtained for the PLA/EVA films which are comparable to neat PLA films. A high enough VA unit content is crucial for superior mechanical properties and high transparency. (C) 2016 Elsevier Ltd. All rights reserved.
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