Investigation of poly( l -lactic acid)/graphene oxide composites crystallization and nanopore foaming behaviors via supe
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ang-Fang Peng National Engineer Research Center of Novel Equipment for Polymer Processing, The Key Laboratory of Polymer Processing Engineering of Ministry of Education, South China University of Technology, Guangzhou 510640, People’s Republic of China
Xin Jing Department of Industrial Equipment and Control Engineering, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
Leng-Wan Li and An Huang Technology Development Center for Polymer Processing Engineering of Guangdong Colleges and Universities, Guangdong Industry Technical College, Guangzhou 510640, People’s Republic of China
Bai-Ping Xu Technology Development Center for Polymer Processing Engineering of Guangdong Colleges and Universities, Guangdong Industry Technical College, Guangzhou 510640, People’s Republic of China
Bin-Yi Chenb) National Engineer Research Center of Novel Equipment for Polymer Processing, The Key Laboratory of Polymer Processing Engineering of Ministry of Education, South China University of Technology, Guangzhou 510640, People’s Republic of China
Hao-Yang Mia) Department of Industrial Equipment and Control Engineering, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China (Received 17 July 2015; accepted 5 January 2016)
Poly(lactic acid) (PLA)/graphene oxide (GO) nanocomposites were prepared by solution mixing. Differential scanning calorimetry results indicated that GO was an effective nucleating agent. The size of spherulites decreased, the density of spherulites increased with increasing GO and the crystallinity of PLA increased from 4.34 to 49.01%. For isothermal crystallization, the crystallization rates of PLA/GO nanocomposites were significantly higher than that of neat PLA, in which t0.5 reduced from 9.0 to 2.8. Spindle-like nanopores (about 100–200 nm) that arranged like spherulites were prepared by low temperature foaming. It was found that the crystallization rate increase and spherulite morphology change were insignificant when the content of GO exceeded 0.5 wt%, because the excessive GO increased the number of nucleation sites while restricting the PLA crystal growth. Thus, the arrangement of nanopores did not mimick the spherulites because of imperfect crystal morphology.
I. INTRODUCTION
The poly(lactic acid) (PLA), a biodegradable aliphatic thermoplastic polyester, is an excellent biomaterial that Contributing Editor: Linda S. Schadler Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2016.13
can be produced from renewable resources.1 Possessing high modulus and high strength, PLA is a good choice for petroleum-based polymer replacement. The excellent biocompatibility and absorbability of PLA have made it suitable for medical applications such as drug delivery systems, sutures and blood vessels.2 Even through PLA possesses excellent properties, it is still necessary to improve the crystallinity
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