Crystallization Behavior of Polymer Nanocomposites

Abstract

This chapter is an overview of theeffect of the different nanofillers in the crystallization performance of polymer matrices. The mostrelevantnanocomposites were classified according to the natureofthereinforcement. In general, it was reported that the way of processing highly affect the crystal sizes, crystalline structure and the degree of crystallinity of semicrystalline polymer nanocomposites, then modifying the performance of the material. Therefore, the influence of differentcrystallization processesonbarrier, thermal stability, dynamic or mechanical properties ofnanocomposites was described. Moreover, it was observed that the crystallization mechanism of polymers in the nanocomposites strongly depends on the intrinsic characteristics of the nanoparticles and the matrix, and in consequence the dispersion of the filler in the matrix. This chapter focuses on the studies about the effect of different types of nanofillers on several aspects of polymer crystallization, such as kinetics, crystal structure, nucleation effect as well as spherulitic grow and morphology.

Nanocomposites Based on Poly(lactic acid) and Bacterial Cellulose Acetylated by an α-Hydroxyacid Catalyzed Route

“…Evidentemente, la naturaleza química de la superficie de la BNC, y por ende su dispersabilidad y compatibilidad relativa con la matriz hidrofóbica de PLA, jugó un rol fundamental en controlar la posibilidad de cristalización del poliéster. Lo anterior es, probablemente, una consecuencia de fenómenos contrapuestos asociados a i) la difusión y plegado de las cadenas de PLA que se ven parcialmente impedidos como consecuencia de la compatibilización (Cyras, D' Amico, & Manfredi, 2017), y ii) los efectos de nucleación inducidos por la dispersión relativa de los refuerzos. (Dai, Cao, & Wang, 2016;Teixeira et al, 2014).…”

Fabrication, Characterization, and Properties of Poly (Ethylene-Co-Vinyl Acetate) Composite Thin Films Doped with Piezoelectric Nanofillers

“…of BaTiO 3 . It was observed that the crystallization mechanism of nanocomposite polymers may strongly depend on the intrinsic features of the nanofiller and in consequence its dispersion in the polymeric matrix [33]. For example, in well-dispersed nanocomposites the growing lamellae can influence the disposition of the included nanoparticles, thereby broadening interstitials to allow bulk-like lamellae to form [34].…”

Hydrogels Classification According to the Physical or Chemical Interactions and as Stimuli-Sensitive Materials

“…The crystallization and degree of crystallinity determine the final properties of the resulting polymers. Polymeric crystallization can occur from dilute solutions or the molten state [ 22 ]. In the first case, crystallization occurs by evaporating the solvent, resulting in the appearance of single crystals based on a chain-folded model, which presents aligned chains [ 23 ].…”