Processing of Composites (Progress in Polymer Processing) - download pdf or read online

By Raju S. Davé, Alfred C. Loos

ISBN-10: 1569902267

ISBN-13: 9781569902264

ISBN-10: 3446180443

ISBN-13: 9783446180444

ISBN-10: 3446401776

ISBN-13: 9783446401778

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Sample text

2). The propagation then occurs by repeating the addition and hydrogen extraction reactions. " In reality, deactivation, branching, and a series of reversible transacylation reactions occurring during the anionic ring opening polymerization of caprolactam produce side reaction products, heterogeneities in the resultant polymer structure, and a broad molecular weight distribution [55]. The low temperature (~ 1400C) anionic ring opening polymerization is further complicated by the crystallinity in nylon 6.

The conversion at which the relative complex viscosity curve deviates from the linear, straight-line fit depends on the polymerization temperature because both kinetics of polymerization and kinetics of crystallization are temperature dependent. For polymerization near 145°C, where the crystallization rate is greatest [64], crystallization kinetics strongly competes with chemical kinetics. On the other hand, for polymerization at 160° C, crystallization rate is drastically reduced [66] and, therefore, the 1600C curve does not exhibit the gelation effect.

The maximum measurable complex viscosity levels were achieved in about 100 s or less, depending on temperature. At each temperature, the expected rapid rise of complex viscosity with conversion, molecular weight build-up, and ultimate solidification was observed and the complex Time (sec) viscosity-time relationship was quantified. The time to achieve maximum permissible torque on the instrument ranged from about 90s at 1200C to 40s at 1600C. , total solidification). 13 shows replicated complex viscosity-time curves for all five temperatures.

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Processing of Composites (Progress in Polymer Processing) by Raju S. Davé, Alfred C. Loos

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