Relation between Morphology Structure, Processing, and Properties

2 Relation between Morphology Structure, Processing, and Properties 

On samples previously drawn at different temperatures, de Candia et al. found similar behavior [36]. The analysis of the dynamic-mechanical behavior showed two effects an appreciable increase in the elastic modulus on drawing and a relevant increase in the glass transition temperature. The modulus hardening can be considered as a further indication of the morphological and topological reorganization induced by drawing. 

Lawrence [77] found that samples slowly cooled from the melt are much stiffer than cold-crystallized samples with similar nominal amount of crystal- 

The authors showed that the reason for this difference is the constraint of the amorphous phase by the high-modulus lamellae, and the variation in phase contiguity. In slowly cooled samples the crystalline phase is mechanically contiguous and the inter-lameUar amorphous material is more highly constrained than in the quenched-annealed samples. 

Petermann, J. Morphology and structure of syndio-tactic polystyrene. Polymer, 30(4), 590-594 (1989). 

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