The copolymerization of styrene and maleic anhydride initiated by peroxides of isotactic polypropylene

Citovický, P.; Chrástová, Viera; Földesová, M.

doi:10.1016/0014-3057(95)00129-8

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…However, requirement of surfactant as interfacial agent, metal salts and other ingredients, makes grafting dependent on more parameters. Surekha Devi [23] has reported a novel method of cleavage hydroperoxide group in water medium and gained a high grafting percentage (G p ) and grafting efficiency (G e ). The schematic mechanism of grafting polar monomers on the surface of HPP was also proposed.…”

Section: Introductionmentioning

confidence: 99%

Grafting dual polar monomers onto hydroperoxidized polypropylene with the assistant of supercritical carbon dioxide

Wang

2017

Appl Petrochem Res

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A hydroperoxidized polypropylene (HPP) was obtained by oxidizing PP porous particle in solid phase, followed by impregnating dual polar monomers of pentaerythritol triacrylate (PETA) and styrene (St) into the HPP with the aid of supercritical carbon dioxide (scCO 2 ). Then, HPP was used as polymerization initiators and PETA/St were grafted onto microporous PP backbone in water medium. Effects of hydroperoxidation temperature, time, oxidant dosage and PP diameter on hydroperoxides concentration and G p and G e were illustrated systematically. Besides, effects of scCO 2 swell time, pressure, monomers concentration and ratio, grafting reaction time and temperature on G p and G e were also examined. Results showed that G p can be easily controlled by changing process conditions; G e was observed to be greater than 90% in most of the cases. Gel content of grafted samples was also determined. The structures and thermal properties of grafted copolymers were characterized through FTIR, SEM, TGA and DSC.

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Section: Introductionmentioning

confidence: 99%

Grafting dual polar monomers onto hydroperoxidized polypropylene with the assistant of supercritical carbon dioxide

Wang

2017

Appl Petrochem Res

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“…However, there are some side reactions of β‐scission due to the instability of tertiary carbon radicals during the chemical modification process. Therefore, some highly reactive monomers are often used as comonomers, such as styrene . In addition, some dimethyldithiocarbamate reagents can also prevent PP from degradation by their reversible reactions with macromolecule radicals .…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of styrene and zinc dimethyldithiocarbamate on the properties of high melt strength polypropylene

Shao

et al. 2015

Vinyl Additive Technology

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High melt strength polypropylene was successfully prepared by a reactive extrusion method, in which pure polypropylene without any additives was used as a basic resin; trimethylolpropane triacrylate was used as a grafting monomer, and styrene and zinc dimethyldithiocarbamate (ZDMC) were used as trapping radicals. The synergistic effects of styrene and ZDMC on melt strength and melt flow rate of modified polypropylene were investigated. When the additions of styrene and ZDMC were 3.5 parts by weight per hundred parts of resin (phr) and 0.3 phr, respectively, the melt strength of modified polypropylene (PP5) was about 21 cN, which was much higher than that of modified polypropylene without styrene (PP0, 4.6 cN). Moreover, crystallization behavior and mechanical properties of modified polypropylene were also investigated. The results showed that the melt and crystallization temperatures of modified polypropylene with styrene were higher than those without styrene, and the size of crystal was smaller. Moreover, the mechanical properties of modified polypropylene were greatly improved in the presence of styrene. J. VINYL ADDIT. TECHNOL., 00:000-000, 2015.

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“…P. Citovicky 4 investigated the mechanism of graft styrene (ST) and methyl methacrylate (MAA) onto PP. They 5-7 also attempted to explain the "real" initiating center of this kind of reaction.…”

Section: Introductionmentioning

confidence: 99%

Study of electron beam preirradiation-induced graft copolymerization of acrylic acid onto powdered isotactic polypropylene

Daitao

Shi

1999

J. Appl. Polym. Sci.

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ABSTRACT:In order to obtain required polymer materials, acrylic acid was grafted onto powdered isotactic polypropylene by an electron beam preirradiation technique. All processes (including irradiation, storage of the samples, and grafting polymerization) were carried out in air. The effects of irradiation dose, storage time, reaction temperature, morh's salt, acid, and monomer concentration were investigated and discussed in detail. The results show that the grafting can be achieved well without purging oxygen, and morh's salt is indispensable for initiating grafting reaction and decreasing the homopolymerization. Optimal reaction conditions can be generalized for large-scale production of the desired polymer materials.

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The copolymerization of styrene and maleic anhydride initiated by peroxides of isotactic polypropylene

Cited by 10 publications

References 20 publications

Grafting dual polar monomers onto hydroperoxidized polypropylene with the assistant of supercritical carbon dioxide

Grafting dual polar monomers onto hydroperoxidized polypropylene with the assistant of supercritical carbon dioxide

Synergistic effect of styrene and zinc dimethyldithiocarbamate on the properties of high melt strength polypropylene

Study of electron beam preirradiation-induced graft copolymerization of acrylic acid onto powdered isotactic polypropylene

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