Dielectric relaxation of various end-functionalized polystyrenes: Plastification effects versus specific dynamics

Studies the behaviors of polyaniline on the properties of PS/PMMA blends

“…Tg values of pure PS and PMMA corresponding to the values of ɛ″ at the α-peaks are 117 and 107 ℃ ± 2, respectively. The comparison of the maximum of peaks with the Tg of differential thermal analysis 3,19–21 indicates that Tg of PS is 100–110 ℃ while Tg of PMMA is 85–105 ℃. The discrepancy between these values and the obtained values from dielectric loss ɛ″ is due to different factors including thermal history of the sample, the evaluation of the heat flow curve, and the effect of finite sample size.…”

Detecting different modes of molecular motion in polyisobutylene and chlorinated butyl rubber by using dielectric probes

“…20 In order to solve this problem, various methods, such as oxidation, chlorination and functionalization, have been used to introduce polar groups. [28][29][30] Recently, some small molecules with large permanent dipole moments were introduced into polyolefins, and it was found that the small molecules acted as dielectric probes providing a connection between the molecular motion of nonpolar polymers and the external electric probing field, which consequently facilitated the investigation of glass transition dynamics of polyolefines. [24][25][26][27] In the present work, our objective is to examine the capability of dielectric probes to detect different modes of molecular motion.…”

General Functionalization Method for Synthesis of α‐Functionalized Polymers by Combination of Anionic Polymerization and Hydrosilation Chemistry

“…The living α‐pentenylpoly(styryl)lithium can also react with terminal functionalizing agents, e.g. ethylene sulfide33 or chlorodimethylsilane,13–17 to form α‐4‐pentenyl‐ω‐functionalized polymer chain ends. α,ω‐Telechelic and α,ω‐heterotelechelic polymers can then be formed using the chemistry outlined herein.…”

“…GFM encompass reactions that efficiently introduce a variety of functional groups using the same chemistry for all groups. GFM of importance include the reactions of polymeric organolithium compounds with (a) substituted chlorosilanes,3 (b) substituted 1,1‐diphenylethylenes,4–6 (c) substituted alkyl chlorides,7–9 (d) substituted epoxides,10–12 and more recently (e) chlorodimethylsilane to form the corresponding ω‐silyl hydride‐functionalized polymers followed by platinum‐catalyzed hydrosilation with substituted alkenes 13–17…”