Application of SSA thermal fractionation and X‐ray diffraction to elucidate comonomer inclusion or exclusion from the crystalline phases in poly(butylene succinate‐ran‐butylene azelate) random copolymers |
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| Authors: | Idoia Arandia Agurtzane Mugica Manuela Zubitur Amaia Iturrospe Arantxa Arbe Guoming Liu Dujin Wang Rosica Mincheva Philippe Dubois Alejandro J Müller |
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| Institution: | 1. POLYMAT and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel De Lardizabal 3, Donostia‐San Sebastián, Spain;2. Chemical and Environmental Engineering Department, Polytechnic School, University of the Basque Country UPV/EHU, Donostia‐San Sebastián, Spain;3. Centro de Física de Materiales (CFM) (CSIC‐UPV/EHU)—Materials Physics Center (MPC), Paseo Manuel De Lardizabal 5, San Sebastián, Spain;4. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China;5. Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, Mons, Belgium;6. Basque Foundation for Science, IKERBASQUE, Bilbao, Spain |
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| Abstract: | Poly(butylene succinate‐ran‐butylene azelate) random copolyesters were thermally fractionated by successive self‐nucleation and annealing (SSA). The samples before and after SSA were analyzed by differential scanning calorimetry (DSC) and X‐ray diffraction (WAXS and SAXS). WAXS results indicate that a small degree of comonomer inclusion is present in the crystalline phases that are formed in the copolymers depending on composition: a PBS‐like unit cell or/and a PBAz‐like unit cell, thus confirming the isodimorphic behavior of the samples. SSA on the other hand demonstrated that the degree of comonomer exclusion during crystallization is far larger than comonomer inclusion, as judged by the increase in fractionation degree with compositions leading to the pseudo‐eutectic point. Furthermore, WAXS, SAXS, and SSA results show that the isodimorphic behavior is not highly dependent on kinetic factors, as the degree of comonomer inclusion or exclusion in the samples was not significantly altered by SSA thermal fractionation, a thermal treatment that promotes annealing and molecular segregation of defects to the amorphous regions of the material. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 2346–2358 |
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| Keywords: | comonomer inclusion crystallization isodimorphism poly (butylene succinate– ran– butylene azelate) random copolymers successive self‐nucleation and annealing |
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