Thermoplastic elastomers (TPEs) based on high-density polyethylene (HDPE)/waste ground rubber tire (WGRT) powder composites were prepared by melt compounding, and the composites were compatibilized by styrene-butadiene-styrene block copolymer (SBS). The effects of the SBS compatibilizer on mechanical properties, morphological properties and the Mullins effect of the composites were investigated systemically. Experimental results indicated that SBS had a good compatibilization effect on the HDPE/WGRT composites. Compared with HDPE/WGRT composites, the tensile strength and the elongation at break went through maximum values at a compatibilizer resin content of 12 phr. Morphological study showed that the interface interaction of the HDPE/WGRT composites compatibilized by SBS was strong, which contributed to the significantly improved mechanical properties. The Mullins effect results showed that the softening appeared after the first loading of the HDPE/WGRT and HDPE/SBS/ WGRT composites, the maximum stress decreased at the later cycles, and the residual deformations in uniaxial loading-unloading cycles of the HDPE/SBS/WGRT sample were lower than those of the HDPE/WGRT sample, indicating that the elasticity of the HDPE/SBS/WGRT TPE was improved.
A facile approach
is reported toward a thermoresponsive single-chain/colloid
composite Janus nanoparticle by the termination of the corresponding
anionic living single polymer chain onto the chlorine-capped Fe3O4 nanoparticle. Poly(2-(2-methoxyethoxy) ethyl
methacrylate) (PMEO2MA) is selected as an example of a
thermoresponsive polymer, which can be easily synthesized by anionic
living polymerization. The Janus nanoparticle serves as a highly effective
thermoresponsive solid surfactant, which can be manipulated with a
magnet. The Janus/hydrophobic reversible transition can be triggered
by near-infrared (NIR) irradiation to occur at a lower surrounding
temperature owing to the photothermal effect of Fe3O4 nanoparticle. Integration of thermal response from PMEO2MA and paramagnetic and photothermal effects from Fe3O4 within the Janus nanoparticle, a powerful tool is provided
to easily control the stability and microstructure of the emulsions.
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