ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Thermoplastic composites may exhibit a wide range of crystalline morphologies in the neighbourhood of fibres. It was found that glass fibre shearing of a molten polypropylene at high temperature modifies the subsequent isothermal crystallization (T c=122°C) under static conditions. The crystallization results have been analysed as a function of the previous high temperature, shear, γ, shear rate, $$\dot \gamma $$ , and shear stress, τ. The mechanical parameters at high temperature, γ, $$\dot \gamma $$ , τ, have been calculated for two shearing temperatures (T=170, 210°C) and two fibre displacements. An α-phase nucleation process took place at the fibre surface after shearing at the higher temperature (T=210°C). The nucleation increased with shear but did not appear for static conditions. A strong nucleation process in β phase appeared on the fibre surface after shearing of the polymer at the lower temperature (T=170°C). These strong morphological modifications with shearing temperature have been analysed as a function of mechanical and thermodynamical parameters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01133748
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