Instability of graft copolymers under polymer blending conditions

Zhang, Cai‐Liang; Li, Feng; Hoppe, Sandrine; Hu, Guohua

doi:10.1016/j.ces.2010.12.010

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…Two random copolymers of St and TMI/TMITBC, denoted as P(St‐co‐TMI) and P(St‐co‐TMITBC), respectively, were prepared in a high‐pressure reactor (Parr Instrument Company) by a mixture of styrene and TMI/TMITBC at 80°C (in Schemes and , respectively), with BPO as initiator and toluene as solvent. The procedure was similar to the literature .…”

Section: Methodsmentioning

confidence: 99%

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Zhang

Zhu

et al. 2014

Polym Eng Sci

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Isocyanate‐ and amine‐functionalized polypropylene (PP) and polystyrene (PS) were prepared through grafting and copolymerization method. These compounds are used as precursors for PP‐graft‐PS (PP‐g‐PS) copolymers and reacted at the matrix interface of PP/PS blends. Functionalized polymer structures were characterized by 1H NMR and FTIR spectroscopy. The effects of the synthesized compatibilizer on the rheological and morphological behavior of PP/PS blends were investigated systematically. Results showed that the functional polymer was successfully synthesized, and the additional two different compatibilizer systems dramatically decreased the size of the dispersed phase domains in PP/PS blends. Compared with the uncompatibilized blends, compatibilized blends exhibited a slightly higher crystallization temperature because the melting points of the blend components were not evidently affected by the addition of compatibilizer, as revealed by differential scanning calorimetry. The compatibilizer effect on the PP/PS blends was reflected through rheological property and dynamic mechanical analysis. POLYM. ENG. SCI., 55:614–623, 2015. © 2014 Society of Plastics Engineers

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Section: Methodsmentioning

confidence: 99%

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Zhang

Zhu

et al. 2014

Polym Eng Sci

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“…Copolymer concentration on small droplets interface is much higher than that on large droplets interface because the small droplets are regarded as the micelles (or “swollen” micelles) formed by POE‐ g ‐PS copolymer during mixing. Such phenomenon has been observed in many polymer blends which are compatibilized either by premade copolymer or by copolymer from in situ interfacial reaction . Although it is difficult to estimate the amount of copolymers that are detached from the interface to form micelles just from the TEM images, it is believed that the interfacial coverage of copolymer on interfaces between PS and POE can be greatly reduced.…”

Section: Resultsmentioning

confidence: 96%

Role of block copolymer on the coarsening of morphology in polymer blend: Effect of micelles

Huang

2014

AIChE Journal

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The reactive compatibilization of polystyrene/ethylene-a-octene copolymer (PS/POE) blend via Friedel-Crafts alkylation reaction was investigated by rheology and electron microscope. It was found that the graft copolymer formed from interfacial reaction reduced the domain size and decreased the coarsening rate of morphology. The reduction of the interfacial tension is very limited according to the mean field theory even assuming that all block copolymer stays on the interface. With the help of self-consistent field theory and rheological constitutive models, the distribution of graft copolymer was successfully estimated. It was found that large amount of copolymer had detached from the interfaces and formed micelles in the matrix. Both the block copolymer micelles in matrix and the block copolymers at the interface contribute to the suppression of coarsening in polymer blend, but play their roles at different stages of droplet coalescence. In droplet morphology, the micelles mainly hinder the approaching of droplets. V C 2014 American Institute of Chemical Engineers AIChE J, 61: [285][286][287][288][289][290][291][292][293][294][295] 2015

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High vinyl polybutadiene rubber/polypropylene thermoplastic elastomer blends: Optimization of internal mixing process parameters and screening of processing methods

Yue

Liu

Geng

et al. 2023

J of Applied Polymer Sci

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Thermoplastic vulcanizates (TPV) composed of high vinyl polybutadiene rubber (HVPB) and polypropylene (PP) have good thermal stability and damping properties. This work aims to apply a design of experiments (Taguchi L9 orthogonal array) to optimize the mixing parameters (rotor speed, temperature, and time) for the HVPB/PP TPV. The effects of these mixing parameters on its physical and mechanical properties of HVPB/PP TPV follow the order: rotor speed > temperature and time. In the case of the master batch process, the optimum mixing parameters are 60 rpm, 180°C and 8 min. Subsequently, four processes (master batch, static vulcanization, rubber‐plastic premixing, and two‐step processing) are compared using the same optimum mixing parameters. The master batch process turns out to be the best in terms of physical and mechanical properties.

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Instability of graft copolymers under polymer blending conditions

Cited by 4 publications

References 10 publications

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Role of block copolymer on the coarsening of morphology in polymer blend: Effect of micelles

High vinyl polybutadiene rubber/polypropylene thermoplastic elastomer blends: Optimization of internal mixing process parameters and screening of processing methods

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Instability of graft copolymers under polymer blending conditions

Cited by 4 publications

References 10 publications

Preparation of polypropylene and polystyrene with NCO and NH2 functional groups and their applications in polypropylene/polystyrene blends

Preparation of polypropylene and polystyrene with NCO and NH2 functional groups and their applications in polypropylene/polystyrene blends

Role of block copolymer on the coarsening of morphology in polymer blend: Effect of micelles

High vinyl polybutadiene rubber/polypropylene thermoplastic elastomer blends: Optimization of internal mixing process parameters and screening of processing methods

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Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends