New manufacturing processes for block and graft copolymers by radical reactions

Yamamoto, Tadahiro; Aoshima, Kazuyoshi; Ohmura, Hideki; Moriya, Yasuo; Suzuki, N.; Oshibe, Yoshihiro

doi:10.1016/0032-3861(91)90556-x

Cited by 39 publications

(19 citation statements)

References 6 publications

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“…At that temperature, the decomposition of pendant peroxycarbonate groups is reported to be considerably small. 13 Table V shows the results of the copolymerization of HEPO with MMA initiated by azo groups introduced onto the glass plate surface. The contact angle of the poly(MMA-co-HEPO)-grafted Figure 3 shows the relationship between the polymerization time and contact angle of glass glass plate decreased with increasing HEPO content of the grafted copolymer.…”

Section: Cationic Graft Polymerization Initiated By Gp-chmentioning

confidence: 99%

Surface grafting of polymers onto glass plate: Polymerization of vinyl monomers initiated by initiating groups introduced onto the surface

Tsubokawa

Satoh

1997

J. Appl. Polym. Sci.

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ABSTRACT:The surface grafting of polymers onto a glass plate surface was achieved by the polymerization of vinyl monomers initiated by initiating groups introduced onto the surface. Azo groups were introduced onto the glass plate surface by the reaction of 4,4-azobis(4-cyanopentanoic acid) with isocyanate groups, which were introduced by the treatment with tolylene-2,4-diisocyanate. The radical polymerization of various vinyl monomers was initiated by azo groups introduced onto the glass plate surface and the corresponding polymers were grafted from the surface: The surface grafting of polymers was confirmed by IR spectra, and the contact angle of surface, with water. The contact angle of the glass plate increased by the grafting of hydrophobic polymers, but decreased by the grafting of hydrophilic polymers. The radical postpolymerization was successfully initiated by the pendant peroxycarbonate groups of grafted polymer on the surface to give branched polymer-grafted glass plate. The cationic polymerization of vinyl monomers was also successfully initiated by benzylium perchlorate groups introduced onto the glass plate surface and the corresponding polymers were grafted onto the surface. The contact angle of the glass plate surface obtained from the cationic polymerization of styrene was larger than that obtained from the radical polymerization.

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Section: Cationic Graft Polymerization Initiated By Gp-chmentioning

confidence: 99%

Surface grafting of polymers onto glass plate: Polymerization of vinyl monomers initiated by initiating groups introduced onto the surface

Tsubokawa

Satoh

1997

J. Appl. Polym. Sci.

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“…6 On the other hand, vinyl polymers having pendant peroxycarbonate groups were easily synthesized by the copolymerization of vinyl monomers with t-butylperoxy-2-methacryloyloxyethylcarbonate (HEPO) and applied to synthesis of various graft copolymers. 7 We have also reported that the polymer radicals formed by the decomposition of polymers having pendant peroxycarbonate groups, which were synthesized by the copolymerization of HEPO with vinyl monomers, were trapped by a carbon black surface to give the corresponding polymer-grafted carbon blacks. 8 In the present article, the introduction of peroxycarbonate groups onto a silica surface by the Michael addition of amino groups previously introduced onto the silica surface to HEPO [Scheme 1 (1)] and the radical graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto silica surface [Scheme 1 (2)] were investigated.…”

Section: Introductionmentioning

confidence: 98%

Graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto silica surface by Michael addition

Hayashi¹,

Takeuchi²,

Eguchi³

et al. 1999

J. Appl. Polym. Sci.

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ABSTRACT:The introduction of peroxycarbonate groups onto a silica surface and the graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto a silica surface were investigated. The introduction of peroxycarbonate groups onto a silica surface was achieved by Michael addition of amino groups introduced onto the silica surface to t-butylperoxy-2-methacryloyloxyethylcarbonate (HEPO). The amount of peroxycarbonate groups was determined to be 0.17 mmol/g. The graft polymerization of various vinyl monomers such as styrene (St), N-vinyl-2-pyrrolidinone (NVPD), and 2-hydroxyethyl methacrylate (HEMA) was initiated by peroxycarbonate groups introduced onto the silica surface to give the corresponding polymer-grafted silicas. The percentage of poly(St)-grafting reached about 120% after 5 h. This means that 1.20 g of poly(St) is grafted onto 1.0 g of silica. The surface of poly(St)-grafted silica shows a hydrophobic nature, but the surfaces of poly(NVPD) and poly(HEMA)-grafted silica show a hydrophilic nature. Furthermore, the poly(St)-grafted silica was found to give a stable colloidal dispersion in a good solvent for the grafted polymer.

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“…Investigations on the use of organic peroxide to compatibilise PP/PE blend have been carried out [34,43,44] showing degradation of PP and chain extension and/or branching in the PE phase in the presence of peroxide. By introduction of a co-agent, extensive crosslinking in the PP/LDPE blend occurs at higher peroxide concentrations [38] leading to an increased interaction in the interphase owing to the formation of interlinks between PE and PP.…”

Section: Introductionmentioning

confidence: 98%

“…Focusing on the peroxide-initiated free radical reactions in polymers, various efforts have been made to develop further this approach such as interfacial free-radical grafting and/or crosslinking [37,38] and phase compatibilisation [39,40]. In some cases, a crosslinking agent or monomers have been added [32,41,42] to improve the interfacial grafting.…”

Section: Introductionmentioning

confidence: 99%

Interfacial strengthening of high-impact polypropylene compounds by reactive modification

Pham¹,

Gahleitner²

2005

Composite Interfaces

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The effects of reactive modification on the interfacial strength in high-impact polypropylene materials have been investigated using a model system and demonstrated in two specific examples on high flow materials for thin wall injection moulding and reinforced compounds for engineering applications. Using Borealis' proprietary modification technology, the modification degree was controlled by varying the free radical initiator and co-agent content, respectively. The influence of the modification degree on the formation of ethylene-propylene copolymer grafted to polypropylene, which is believed to be the main reason for the strengthened interface between the PP matrix and EPR particles, the phase morphology and material properties was investigated. Depending on practical application requirements, a well defined material performance such as toughness, flowability, surface stability, etc. could be adjusted.

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New manufacturing processes for block and graft copolymers by radical reactions

Cited by 39 publications

References 6 publications

Surface grafting of polymers onto glass plate: Polymerization of vinyl monomers initiated by initiating groups introduced onto the surface

Surface grafting of polymers onto glass plate: Polymerization of vinyl monomers initiated by initiating groups introduced onto the surface

Graft polymerization of vinyl monomers initiated by peroxycarbonate groups introduced onto silica surface by Michael addition

Interfacial strengthening of high-impact polypropylene compounds by reactive modification

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