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Dynamic mechanical study of clay dispersion in maleated polypropylene/organoclay nanocomposites
Author(s) -
Wang Yeh,
Huang SyhW.,
Guo JiangY.
Publication year - 2009
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20681
Subject(s) - materials science , organoclay , polypropylene , nanocomposite , exfoliation joint , composite material , maleic anhydride , dynamic mechanical analysis , glass transition , dispersion (optics) , amorphous solid , sonication , montmorillonite , polymer , copolymer , chemical engineering , graphene , nanotechnology , chemistry , physics , organic chemistry , engineering , optics
Morphological characteristics and the dynamic mechanical properties of maleic anhydride grafted polypropylene (PPgMA) and its clay‐filled nanocomposites with different degrees of clay exfoliation have been investigated. Fully and partially exfoliated samples were prepared through powered sonication and melt blending, respectively. Our results indicated that both mechanical α and β relaxations can be identified. The glass (β) transition of the nanocomposites shifted to slightly lower temperatures for nearly all formulations because of reduced chain cooperative motion. However, the broad α transition became more distinct with increasing clay loading for sonicated nanocomposites, and shifted to higher temperatures due to chain confinement of amorphous polymer chains in the crystalline region. The reinforcement in the glassy storage modulus E ′ of PPgMA was examined by the Halpin–Tsai theory. The high aspect ratio of clay stacks in the fully exfoliated nanocomposites resulted in a significant increase in reinforcing efficiency. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers