Effect of polyolefin structrure on maleic anhydride grafting

Machado, A. V.; Covas, J. A.; Duin, Martin van

doi:10.1016/s0032-3861(00)00692-3

Cited by 108 publications

(96 citation statements)

References 32 publications

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“…[12][13][14] Free radical grafting of maleic anhydride (MA) onto polyolefins has gained wide industrial application. [15][16][17] MA modified polyolefins are an essential part of many plastics formulations. They are used as chemical coupling agents, impact modifiers, and compatibilisers for blends and filler reinforced systems.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Polyolefin Graft Polymer available as a Primer for Polyurethane Adhesive (I) Synthesis of polyolefins with cyclic acid anhydride by free radical graft polymerization

Ryu¹,

Kim²,

Min³

et al. 2015

Elastomers and Composites

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Because of their low surface free energy and absence of polar groups at the surface, polyolefins are substrates whose wetting and adhesion are very difficult. Free radical grafting of monomers to backbone polymer is one of the most attractive ways for the chemical modification of polymers. Synthesis of graft copolymer through graft polymerizations of PE and/or PP with phthalic anhydride (PhAn) was made and FTIR spectra of the graft polymer were the examined. And also the effects of phthalic anhydride content on the grafting ratio, thermal properties and contact angle of the graft polymer were examined.

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Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Polyolefin Graft Polymer available as a Primer for Polyurethane Adhesive (I) Synthesis of polyolefins with cyclic acid anhydride by free radical graft polymerization

Ryu¹,

Kim²,

Min³

et al. 2015

Elastomers and Composites

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“…Machado and co-workers 15 showed that in a series of polyolefins with different ethene/propene the MA graft content increases until 50 wt% of propene, for higher propene contents crosslinking and degradation reactions are favored, regardless the grafting process. Maurano and co-workers 18 also observed that keeping MA concentration constant at 20 wt% the graft content increased with increasing the comonomer content, but it decreased with the comonomer length.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most common methods to achieve the polyolefin modification with MA is the reactive process in the presence of a peroxide. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] A comprehensive review of the free radical reactions mechanism involved in this process was published by Moad. 16 The main advantage of such reactive process are the absence of solvent, the short reaction time and it is a continuous process.…”

Section: Introductionmentioning

confidence: 99%

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Grafting of tetrahydrophthalic and maleic anhydride onto polyolefins in solution

Campos

Fantini

Petri

2004

J. Braz. Chem. Soc.

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Polietileno de baixa densidade (LLDPE) com comonômeros 1-buteno e 1-octeno foram funcionalizados com anidrido tetrahidroftálico (THA) e anidrido maléico (MA) em solução na presença de peróxido de benzoíla (BPO), de acordo com planejamentos fatoriais. As variáveis testadas foram concentração de anidrido, concentração de peróxido, tempo de reação e tipo de comonômero. As formulações foram analisadas por espectroscopia vibracional no infravermelho FTIR. Na funcionalização com THA o efeito principal tempo de reação foi significativo, assim como, a interação deste com a concentração de THA, enquanto que no caso do MA as concentrações de BPO e MA foram significativas. Poliolefinas modificadas com teores semelhantes de THA e MA foram analisadas por calorimetria exploratória diferencial (DSC) e por difração de raios X (XRD). Amostras modificadas com THA e MA apresentaram redução na temperatura de fusão de 4,3 °C e 1,4 °C, respectivamente, com relação ao polímero original. Alterações devido à funcionalização também foram evidenciadas por forte redução nas áreas dos picos de difração relativos aos planos cristalinos (110) e (200), corroborando com os dados de calorimetria exploratória diferencial (DSC).Tetrahydrophthalic (THA) and maleic (MA) anhydrides were grafted onto linear low density polyethylene with comonomer 1-butene and 1-octene (LLDPE) in solution in the presence of benzoyl peroxide (BPO) following experimental designs, where anhydride and BPO concentrations, type of comonomer and reaction time were varied. The formulations were analyzed by Fourier transform infrared spectroscopy (FTIR). In the case of THA modified polyolefins, the time of reaction and the interaction between time of reaction and THA concentration influenced the process, whereas the MA and BPO concentrations influenced the grafting of MA onto polyolefins. THA and MA modified polyolefin samples with similar grafting contents were analized by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). THA and MA functionalized polyolefins presented reduction in the melting temperature of 4.3 °C and 1.4 °C, respectively, comparing with the original polymer. These effects corroborate with the strong reduction in the areas of the diffraction peaks (110) and (200) after the grafting process.

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“…White and coworkers also found that adding the vinyl comonomer leads to a higher GD of MAH and less crosslinking of high-density polyethylene (HDPE) at the same time [12][13][14][15][16]. Machado et al [17,18] studied the effect of PE structure on grafting reaction, and found that the side reactions could be suppressed by adjusting the ratio of ethene/propene or ethane/octene in polyolefins. In other words, the crosslinking reaction primarily occurs in functionalization of polyolefins with low propene or octene content, while the degradation is the main side reaction in functionalization of polyolefins with high propene content.…”

Section: Introductionmentioning

confidence: 99%

Maleic anhydride‐grafted linear low‐density polyethylene with low gel content

Le-ping

Zhou

Cui

et al. 2009

Polymer Engineering & Sci

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Maleic-anhydride-grafted linear low-density polyethylene (LLDPE-g-MAH) with low gel content was synthesized by the solid-phase grafting polymerization of low molecular weight linear low-density polyethylene (LLDPE) with melt flow index of 49.4 g/10 min, its structure and properties were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, wide-angle X-ray diffraction, polarized optical microscopy, and capillary rheometer. At the experimental conditions, maleic anhydride is successfully grafted onto LLDPE with the grafting degree of 1.1-2.4% and the gel content less than 3.7% since the chain-branching reaction is dominant side reaction. The melting temperature of LLDPE-g-MAH is higher than that of pristine LLDPE due to the increased molecular polarity, but its degree of crystallinity and crystallization rate decrease due to its chain-branching structure. The apparent viscosity of LLDPE-g-MAH is higher than that of pristine LLDPE, and its shear-sensitivity is weakened due to the chain branching and subsequent difficulty in disentanglement under shear force.

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Effect of polyolefin structrure on maleic anhydride grafting

Cited by 108 publications

References 32 publications

Preparation and Properties of Polyolefin Graft Polymer available as a Primer for Polyurethane Adhesive (I) Synthesis of polyolefins with cyclic acid anhydride by free radical graft polymerization

Preparation and Properties of Polyolefin Graft Polymer available as a Primer for Polyurethane Adhesive (I) Synthesis of polyolefins with cyclic acid anhydride by free radical graft polymerization

Grafting of tetrahydrophthalic and maleic anhydride onto polyolefins in solution

Maleic anhydride‐grafted linear low‐density polyethylene with low gel content

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