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Effect of nano‐silica on the mechanical, thermal, and crystalline properties of poly(vinyl alcohol)/nano‐silica films
Author(s) -
Wang Chao,
Wei Jingwei,
Xia Bingxiang,
Chen Xian,
He Bobing
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38277
Subject(s) - vinyl alcohol , crystallinity , materials science , nano , composite material , rheometry , differential scanning calorimetry , dynamic mechanical analysis , extrusion , ultimate tensile strength , nanoindentation , nanocomposite , plasticizer , amorphous solid , chemical engineering , polymer , chemistry , organic chemistry , physics , engineering , thermodynamics
Poly(vinyl alcohol)/nano‐silica (PVA/nano‐SiO 2 ) films were prepared through extrusion blowing with the addition of water and glycerin as plasticizer. The characteristic properties of PVA/nano‐SiO 2 films were investigated by differential scanning calorimetry, dynamic mechanical analysis, Haake torque rheometry, and atomic force microscopy (AFM). The results showed that the mechanical properties of PVA/nano‐SiO 2 were improved dramatically. The tensile strength of the nanofilms increased from 62 MPa to 104 MPa with loading 0.3 wt % nano‐SiO 2 and the tear strength was improved from 222 KN/m to 580 KN/m. The crystallinity of the films loaded with 0.4 wt. % nano‐SiO 2 decreased from 32.2% to 21.0% and the AFM images indicated that the amorphous region of nanofilms increased with increasing nano‐SiO 2 content. The storage modulus and loss modulus increased to two and nearly three times with 0.3 wt % nano‐SiO 2 loading. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013