Drawing and dynamic-mechanical behavior of syndiotactic polystyrene an introduction

Abstract

The drawing behavior of syndiotactic polystyrene was analyzed at different temperatures. Amorphous films were used and, depending on drawing temperature, strain-induced or thermal-induced cold crystallization was observed. This phenomenon, when present, greatly affects the drawing behavior. The dynamic-mechanical behavior of drawn samples was analyzed, and the obtained results indicate that the glass transition is affected by drawing, and that the effect depends drastically on the drawing temperature. Particularly interesting is the dynamic behavior at high temperature where the elastic modulus is weakly affected by temperature also near the melting point.

Microstructural effects on hot drawing syndiotactic styrene P‐methyl styrene copolymer

“…The drawing behavior and microstructural changes in sPS have been studied previously (12)(13)(14)(15)(16). Some work on the polymorphism of oriented s-PPMS has also been reported (10).…”

“…All previous work on sPS involved the drawing of material that started in the amorphous state, where the crystallization was suppressed by quenching from the melt. A variety of aspects of drawn sPS have been examined: dynamic mechanical properties (12); mesomorphic structure (13): conformational transition (14); melting behavior and orientation (15); and standard tensile properties (16). The present work deals with the drawing of the copolymer SPMS, which, because the constituent chemical components have different properties, might be expected to have characteristics that are different from the properties reported for sPS.…”

Stability of crystal forms of syndiotactic polystyrene correlated with their formation in different media having different solubility parameters

“…Therefore, whatever the mechanism was, the supercritical fluid treatment provided a new route to forming the b form sPS, which has better mechanical properties and solvent resistance [24,47].…”

Effect of low molar mass liquid crystal and lubricant on miscibility and thermal properties of syndiotactic polystyrene blends

“…However, because SPS has some economic disadvantages such as low strength at low temperature, 2 higher processing temperature, 3 and low efficiency of polymerization catalyst, it has been restricted to a few applications. So, many researchers are still interested in blending SPS with secondary polymer materials and in the miscibility of its polymer blends.…”