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Title: Stiffness and toughness of polypropylene/glass bead composites
Authors: Kwok, KW 
Gao, ZM
Choy, CL 
Zhu, XG
Issue Date: 2003
Publisher: John Wiley & Sons
Source: Polymer composites, 2003, v. 24, no. 1, p. 53-59 How to cite?
Journal: Polymer composites 
Abstract: The effects of coupling effect, particle diameter (d), volume fraction (Vb) and size distribution (σ) of glass beads on the impact strength and tensile modulus of polypropylene (PP)/glass bead composites have been investigated. The toughness and stiffness of the composite can be simultanously enhanced by using a titanate coupling agent, which gives rise to a moderate interfacial adhesion (characterized by an interaction parameter B ∼ 1) between the glass beads and the matrix. With the addition of this coupling agent, the impact strength of the PP/glass bead composite with d = 2.7 μm and σ = 1.85 increases about 4.5 times as Vb increases from 0 to 0.25, while the tensile modulus remains roughly unchanged. For the composites with larger d and narrower size distribution, the impact strength increases only slightly with increasing Vb. The combined effect of d, Vb and size distribution of the glass beads are described by using a single parameter, the average matrix ligament thickness T. Unlike rubber-modified polymers, the impact strength of PP/glass bead composites does not follow a master curve when plotted against T.
ISSN: 0272-8397
DOI: 10.1002/pc.10005
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