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Grafting polymerization of polylactic acid on the surface of nano‐SiO 2 and properties of PLA/PLA‐grafted‐SiO 2 nanocomposites
Author(s) -
Wu Feng,
Lan Xiaorong,
Ji Deyun,
Liu Zhengying,
Yang Wei,
Yang Mingbo
Publication year - 2013
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.38585
Subject(s) - materials science , polylactic acid , nanocomposite , crystallinity , grafting , chemical engineering , polymer chemistry , rheology , polymer , composite material , engineering
Abstract Poly(lactic acid) (PLA) chains are directly grafted onto a silicon surface by in situ amidation and PLA/PLA‐grafted SiO 2 nanocomposites are compounded using a Haake torque rheometer. To have a better understanding of the interaction between grafted polymer chains and PLA matrix, thermal, and rheological properties of PLA/PLA‐grafted SiO 2 nanocomposites are explored. DSC analysis shows that PLA‐grafted‐SiO 2 can accelerate the cold crystallization rate and increase the degree of crystallinity of PLA. Shear rheology testing indicates that PLA/PLA‐grafted‐SiO 2 nanocomposites still exhibits the typical homopolymer‐like terminal behavior at low frequency range even at a content of PLA‐grafted‐SiO 2 of 5 wt %, compared to PLA/SiO 2 , it is also found that the nanocomposites show stronger shear‐thinning behaviors in the high frequency region after grafting. In addition, elongation viscosity testing shows the entanglement between grafted chains and matrix that is needed to improve the melt strength of PLA. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013