Journal
POLYMER-PLASTICS TECHNOLOGY AND ENGINEERING
Volume 53, Issue 9, Pages 917-926Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03602559.2014.886061
Keywords
Epoxy vinyl polyhedral oligomeric silsesquioxanes; Isothermal cold crystallization; Melting behavior; Nanocomposite; Poly(lactic acid)
Categories
Funding
- Key Science and Technology Project of Shanxi Province [20100321081]
- Department of Personnel of Shanxi Province
- Priority Academic Program Development of Jiangsu Higher Education Institution
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Poly(l-lactic acid) (PLA)/epoxy vinyl polyhedral oligomeric silsesquioxane (EP-POSS) nanocomposites were prepared via melt blending. The isothermal cold crystallization and melting behavors of pure PLA and its nanocomposites were investigated using differential scanning calorimetry (DSC). The crystal growth model of PLA was a mixture of two-dimensional discotic growth and three-dimensional spherulite growth, as evidenced by the values of the Avrami exponent ranging from 2.15 to 2.66. The crystallization rate displayed a great dependence on the EP-POSS loading level and crystallization temperature, and a transition from regime II to regime III was observed around 115 degrees C. The values of fold surface free energy were calculated from the nucleation parameter which was determined by the Hoffman-Lauritzen equation. Polarizing microscope images (POM) indicated that EP-POSS promoted the nucleation of
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