Non‐isothermal crystallization behavior of PLA/acetylated cellulose nanocrystal/silica nanocomposites. Issue 1 (2nd November 2015)

• Record Type: Journal Article
• Authors: Myoung, Seok Han; Im, Seung Soon; Kim, Seong Hun
• Is Part Of: Polymer international. Volume 65:Issue 1(2016:Jan.)
• Page Start: 115
• Page End: 124
• Publication Date: 2015-11-02
• Subjects: poly(lactide) -- polymer nanocomposites -- cellulose nanocrystal -- silica -- non‐isothermal crystallization; Plastics -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.7
• DOI: 10.1002/pi.5038
• Languages: English
• ISSNs: 0959-8103

Abstract

Abstract: Poly(lactide) (PLA)/acetylated cellulose nanocrystals (ACN)/silica nanocomposites were prepared by solution casting. Surface modification of cellulose nanocrystal (CNC) was performed to prepare the ACN. The ACN and silica were expected to act as a mechanical reinforcement of PLA and a nucleation agent, respectively, to increase the crystallization rate. Introduction of acetyl groups on the surface of the cellulose nanocrystals was confirmed by Fourier transform infrared spectroscopy. A combined Avrami − Ozawa analysis described the non‐isothermal crystallization effectively. The activation energy for the crystallization was calculated from the Kissinger and the Takhor equations. Spherulite growth behavior was observed by polarizing optical microscope and spherulite growth rate, the number of spherulite versus crystallization time have investigated. The development of PLA crystals and the thermal stability had a tendency to improve with increasing silica content. Increased tensile strength was observed due to the reinforcement effect of ACN and the morphology of the nanocomposites was investigated. © 2015 Society of Chemical Industry Abstract : The heterogeneous nucleation effect of silica had an impact on the crystalization process, increasing number of spherulites as well as crystalline region.