The role of particle surface functionality and microstructure development in isothermal and non-isothermal crystallization behavior of polyamide 6/cellulose nanocrystals nanocomposites

POLYMER

卷:107

Article

Rahimi, Shahab Kashani¹  Otaigbe, Joshua U.¹ 

[1] Univ Southern Mississippi, Sch Polymers & High Performance Mat, 118 Coll Dr, Hattiesburg, MS 39406 USA

关键词: Crystallization kinetics;    Cellulose nanocrystals;    Cellulose whiskers;    Polyamide 6 nanocomposite;    Crystallization activation energy;   

DOI  :  10.1016/j.polymer.2016.11.023

来源: Elsevier

【 摘 要 】

Polyamide 6 (PA6)/cellulose nanocrystal (CNC) and aminopropyl triethoxy silane (APS) - modified CNC nanocomposites were prepared by in situ anionic ring opening polymerization and subsequent melt extrusion. The morphological observation of these hybrid systems revealed that the non-modified nanocrystals developed a network-like fibrillar structure while the APS-modified CNCs were finely dispersed mostly as individual whiskers. The isothermal and non-isothermal crystallization kinetics was extensively studied with emphasis on the effects of CNC surface functionality and the subsequent microstructure development on crystallization behavior of these novel nanocomposite systems. The non-modified CNC particles with corresponding fibrillar microstructure were found significantly hinder the crystallization process and spherultic growth of polyamide 6 chains under both isothermal and non-isothermal conditions. On other hand, the surface modified cellulose nanocrystals with improved submicron dispersion enhance crystal nucleation in early stages of crystallization while imposing opposite effect in later stages of crystallization resulting in development of relatively smaller defective spherulitic structures. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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