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- W2016172902 abstract "Syndiotactic polystyrene (sPS) is a chemically resistant, high-heat, semi-crystalline polymer which is currently under development by The Dow Chemical Co. The research reported herein was undertaken to determine the critical fracture strength, i.e., the critical stress intensity factor, K1C, and the fracture energy, G1C, of sPS. The studies were aimed at developing a basic understanding of the failure mechanism and toughness of sPS. This work included investigations of the effect of molecular weight, as well as flow-induced anisotropy. Scanning electron microscopy (SEM) was used to aid in the determination of the failure mechanism. During failure testing, it was observed that sPS fails with a slow, controlled crack growth and ruptures with an almost nondetectable amount of yielding, as based on a tensile dilatometry investigation and a plane strain, biaxial yield experiment. The proposed failure mechanism, based on the scanning electron micrographs, is one of constrained crazing, followed by void coalescence with the spherulite nucleators acting as stress concentrators in the system. The damage appears to be greatly confined, with little initial cold-drawing of the spherulites. Addition of a nucleator reduces the K1C values somewhat, as added nucleation sites proliferate the sites for stress concentration across the sample. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 673–681, 1997" @default.
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- W2016172902 date "1997-04-25" @default.
- W2016172902 modified "2023-10-14" @default.
- W2016172902 title "Failure and deformation studies of syndiotactic polystyrene" @default.
- W2016172902 doi "https://doi.org/10.1002/(sici)1097-4628(19970425)64:4<673::aid-app6>3.0.co;2-k" @default.
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