Cooperativity and Structural Relaxations in PVDF/PMMA Blends in the Presence of MWNTs: An Assessment through SAXS and Dielectric Spectroscopy
作者： Maya Sharma , Giridhar Madras , Suryasarathi Bose
DOI: 10.1021/MA4023718
关键词: Materials science 、 Cooperativity 、 Surface modified 、 Configuration entropy 、 Dielectric spectroscopy 、 Small-angle X-ray scattering 、 Intermolecular force 、 Amine gas treating 、 Work (thermodynamics) 、 Polymer chemistry 、 Chemical engineering
摘要: Intermolecular cooperativity and structural relaxations in PVDF/PMMA blends were studied this work with respect to different surface modified (amine, ∼NH2; carboxyl acid, ∼COOH pristine) multiwalled nanotubes (MWNTs) at 1 wt % near blend’s Tg the vicinity of demixing using dielectric spectroscopy, SAXS, DSC, WAXD. configurational entropy was addressed framework cooperative rearranging region (CRR) Tg. Because specific interactions between PVDF NH2-MWNTs, local composition fluctuates its average value resulting a broad The scale (ξCRR) number segments volume (NCRR) is comparatively smaller NH2-MWNTs. This clearly suggests that cooperatively relaxing reduced due leading more heterogeneity. Tg, as derived from Vogel-Fulcher Adam–Gibbs analysis, redu...
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