Abstract
AbstractThe fracture behavior of blends of poly(vinylidene fluoride) and poly(methyl methacrylate) was investigated all over the composition range. A detailed analysis of the net stress versus crack opening displacement curves was performed. Fracture surface observations allowed statements on the process zone characteristics ahead of the crack tip. For the amorphous blends, the crack initiation energy is well related to the glass transition temperature. For the semicrystalline blends, the fracture energy is correlated with the degree of crystallinity. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012
Highlights
After extensive studies starting in the 1970s in relation to miscibility and piezoelectric properties,[1,2,3,4,5,6] the blends of poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA) got a renewal of interest in recent years with studies aiming at assessing their mechanical behavior.[7,8,9]
The motivation here is to find out what the fracture surface observations can help to better understand the abovementioned partition related to the PVDF contents gathered in Table 2 for the blends corresponding to 50 % F 80
Consideration of the blends of PVDF and PMMA all over the composition range proves to be a powerful tool to assess the characteristics that govern the fracture behavior of polymers
Summary
After extensive studies starting in the 1970s in relation to miscibility and piezoelectric properties,[1,2,3,4,5,6] the blends of poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA) got a renewal of interest in recent years with studies aiming at assessing their mechanical behavior.[7,8,9] By increasing the PVDF content, these blends present a transition from amorphous to semicrystalline structure, which is likely to affect most mechanical properties. The PZ corresponds to the crack initiation stage and related to Ei. Figure 4 dedicated to 0 %F 40 is illustrative of the fracture surface of %F 1⁄4 20 blend but the observations are representative of the other samples issued from %F 40. At this latter PVDF content, the blend was still amorphous, it can be supposed that the slight decrease in Ei and Et is due to the effect of the crystallinity in the stage.
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