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• W2014756851 endingPage "4969" @default.
• W2014756851 startingPage "4961" @default.
• W2014756851 abstract "The present work reports on the study of the influence of the composition in stereomer on the mechanical behavior of d- and l-lactic acid stereocopolymers in relation with strain-induced structural evolution. The stress–strain behavior and structural changes upon stretching above the glass transition temperature have been investigated by means of in situ wide-angle X-ray scattering for a series of nearly random stereocopolymers covering a large range of compositions. All members of the family behaved like elastomers in the initial stage of stretching. However, stereocopolymers of low contents in d-units, [d], exhibited a strain-hardening phenomenon starting at strain 150% < ε < 200%, depending on the draw temperature. This strain-hardening decreased with increasing [d] up to the critical concentration [d]* ≈ 8 mol % above which all copolymers displayed an un-cross-linked rubber behavior over the whole strain range. The decrease of the strain-hardening also depended on the draw temperature, yet this sensitivity did not affect the critical concentration [d]* of the position of the transition. The occurrence of the strain-hardening has been correlated with the buildup of a strain-induced ordered phase, the nature of which being directly related to the draw temperature. Drawing at Td = 90 °C, i.e., about 20–30 °C above Tg depending on the [d] value of the copolymer, resulted in the strain-induced α′-crystalline phase. In contrast, for drawing at Td = Tg + 5 °C, the mesomorphic phase was formed. Moreover, it has been shown that the higher [d], the lower the content of ordered phase, irrespective whether it was crystal or mesophase. A parallel is made between the crystallization capabilities of the copolymers from the quiescent melt and under straining. Only stereocopolymers with [d] < [d]* were able to crystallize from the melt, as in the case of strain-induced crystallization. The occurrence of the strain-induced mesophase only in the case of crystallizable copolymers is taken as a hint of an intermediate state of order precursory to the crystalline state." @default.
• W2014756851 created "2016-06-24" @default.
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• W2014756851 date "2011-05-20" @default.
• W2014756851 modified "2023-10-18" @default.
• W2014756851 title "Thermal and Strain-Induced Chain Ordering in Lactic Acid Stereocopolymers: Influence of the Composition in Stereomers" @default.
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• W2014756851 doi "https://doi.org/10.1021/ma200469t" @default.
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