Orientation and chain relaxation of amorphous polymers and compatible polymer blends
2007; Linguagem: Inglês
10.1007/bfb0115444
AutoresB. Jasse, Jean‐François Tassin, L. Monnerie,
Tópico(s)Polymer Nanocomposites and Properties
ResumoThe technique of infrared dichroism was used to characterize segmental orientation developed above Tg in uniaxially stretched amorphous polymers and their compatible blends. The use of hydrogenated and deuteriated styrene block copolymers leads to a detailed analysis of the orientation relaxation along the chain and a quantitative comparison with the Doi-Edwards model has been performed. — By comparing the orientation relaxation of polystyrene and poly(methyl methacrylate), it has been shown that the friction coefficient is the suitable rescaling quantity. Under conditions where the friction coefficients are the same, both polymers behave identically. — Several compatible blends involving either polystyrene or poly(methyl methyacrylate) have been investigated. In all the systems, the two polymers orient differently and the orientation depends on the blend composition. The change of the molecular weight between entanglements in the blend relatively to the pure components cannot account for the results. On the contrary, the increase in the mean friction coefficient in the blend, resulting from the interactions between the polymers leading to compatibility, appears as a major factor.
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