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Siduo Wu,Guangsu Huang,Jinrong Wu,Hui Li 한국고분자학회 2015 Macromolecular Research Vol.23 No.6
In this paper, a regulated morphology of multi-walled carbon nanotube bundles (CNTBs) in olefin block copolymer (OBC) is achieved via a facile method of short-time strong sonication and solution blending. Inside the CNTBs which consist of several to dozens of nanotubes, the nanotubes exhibit a well aligned structure. With the incorporation of CNTBs, a hybrid shish-kebab superstructure is formed that nanotubes in CNTBs form the central stems and OBC crystals form kebabs on the surface of nanotubes. Superior reinforcement is achieved, e.g., the tensile strength and Young’s modulus can be both tripled with 2 wt% CNTB incorporation. A downshift of G' band of CNTBs in nanocomposites in in situ Raman Spectra can be strikingly 10.09 cm-1, presenting remarkably effective load-transfer and leading to significant reinforcement. Additionally, unique morphology of CNTBs and the low compliance of rigid shish-kebab superstructure with large stereo hindrance could also contribute to the reinforcement of OBC/CNTB nanocomposites. In rheological tests, the nanocomposites exhibit quite low rheological percolation threshold of 0.34 wt% and gel point of 0.634 wt% as well as notable difference in terminal behavior in low frequency zone compared to that of neat OBC, revealing that the rigid bundle structure of CNTBs has remarkable effect on the viscoelastic behavior of OBC.
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Kewei Xiang,Guangsu Huang,Siduo Wu,Jing Zheng,Jingyun Huang,Guangxian Li 한국고분자학회 2014 Macromolecular Research Vol.22 No.8
In this work, styrene-butadiene rubber (SBR) was thermally aged at 130 ℃with ageing period up to 4days. The relaxation behavior was studied by dynamic mechanical analysis (DMA) in temperature scanning modeat multifrequencies and the crosslinking network was characterized by swelling method. Glass transition temperature(Tg) and activation energies (Ea) during transition evaluated by Starkweather method were found to increaseafter ageing. Time-temperature superposition (TTS) procedure was performed to obtain master curve and shift factors(αT). The derived αTs were fitted by William-Landel-Ferry (WLF) and Vogel-Fulcher-Tamman (VFT) equations. WLF fitting parameters confirmed decreased free volume fraction ( f ) and thermal expansion coefficient (αf)near Tg versus ageing time. Temperature dependent relaxation properties were examined by VFT fitting parameterD. It was found that the aged SBR displayed more brittle behavior, becoming more and more deviated from Arrheniusfashion. This phenomenon was illustrated by the enhanced intermolecular coupling and severe crosslinkingduring ageing.
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