Melt grafting of a long-chain unsaturated carboxylic acid onto polypropylene

Huang, Hui; Zhu, Chenyang; Zhou, Zhiping; Liu, N.C

doi:10.1016/s1381-5148(01)00089-x

Cited by 24 publications

(5 citation statements)

References 16 publications

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“…Therefore, the amount of NCMA that can be chemically grafted onto the polymer chains is limited. It is often found [10,20,21,22,23] that the dependence of graft yield on the monomer concentration either reaches a limiting value or passes through a maximum, as it is observed in the case studied here. For instance, Huang et.…”

Section: Figures 2a and 2b Display Different Regions Of The Atr-ir Sp...supporting

confidence: 63%

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Chemical modification of styrene–butadiene–styrene co-polymer by grafting of N-carbamyl maleamic acid

Lassalle¹,

Failla²,

Vallés³

et al. 2004

Journal of Adhesion Science and Technology

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A styrene-butadiene-styrene (SBS) block copolymer was functionalized using different amounts of N-carbamyl maleamic acid (NCMA) and benzoyl peroxide as initiator. The NCMA, which is a bifunctional monomer, was synthesized in our laboratories. The concentration of NCMA used in the functionalization of SBS ranged from 0.5 to 3%w/w based on the copolymer mass. Benzoyloxy radicals generated from the thermal decomposition of benzoyl peroxide initiated the grafting reaction.The concentration of the initiator was kept constant at 0.076% w/w. FTIR spectroscopy was used to determine the amount of NCMA effectively grafted onto the SBS. The maximum amount of monomer grafted was about 0.3%w/w when the SBS was modified with 1%w/w of NCMA. The effect of grafting on the surface properties and the adhesion to polyurethane adhesive of the modified SBS were evaluated. Contact angle values were obtained using liquid droplets.When the concentration of the NCMA used in the grafting reaction was 1% w/w, the contact angles with water on original and modified SBS were 95° and 77°, respectively. Adhesion properties were evaluated by standard peel tests employing a commercial polyurethane adhesive. The modified SBS having the largest amount of NCMA displayed a T-peel strength value five times larger than the corresponding value measured with the original SBS.

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Section: Figures 2a and 2b Display Different Regions Of The Atr-ir Sp...supporting

confidence: 63%

“…al. [20] noted the same trend in the graft yield with the monomer concentration when grafting long-chain unsaturated carboxylic acid onto polypropylene. They postulated that there might be insolubility of the monomer in the molten polymer during the grafting process.…”

Section: Figures 2a and 2b Display Different Regions Of The Atr-ir Sp...mentioning

confidence: 54%

Chemical modification of styrene–butadiene–styrene co-polymer by grafting of N-carbamyl maleamic acid

Lassalle¹,

Failla²,

Vallés³

et al. 2004

Journal of Adhesion Science and Technology

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“…DSC measurements of selected samples show a general decrease of T m and a marked increase of T c (Table 2), both effects being particularly evident for samples characterized by high MW and viscosity values. Heterogeneity or defects created by the insertion of functional groups can partially destroy the ordered structure of PP crystals, thus lowering T m with respect to that of ungrafted PP (it is worth noting that PPMAHBFA7 and − 8 are the most functionalized samples) 26, 33. At the same time, the presence of branched structures and particularly LCB is probably responsible for the increased crystallization temperature due to the well‐known nucleation effect and the enlargement of the associated exothermic peaks of DSC traces (Fig.…”

Section: Resultsmentioning

confidence: 99%

Structure and rheology of polypropylene with various architectures prepared by coagent‐assisted radical processing

Augier¹,

Coiai²,

Passaglia³

et al. 2010

Polymer International

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The grafting of polar monomers to polyolefin backbones carried out in the melt in the presence of peroxides is accompanied by a restructuring of the pristine macromolecule architecture depending on reaction conditions and original polyolefin structure In the case of polypropylene (PP), side reactions, mainly degradation, are often controlled by the use of coagents which also provide a more complex scenario as far as possible reactions and final polymer structure are concerned We have demonstrated that 2 furyl acrylates are very active in maintaining the high molecular weight of PP during various functionalization processes carried out in the melt in the presence of peroxides In the study reported here, PP samples modified in the melt by free radical processes initiated with peroxides in the presence of butyl-3-(2-furyl) propenoate and its mixture with maleic anhydride were examined, and the effect of structural changes achieved were related to the rheology of the melt and morphological behaviour under heating Rheological analysis is consistent with the formation of long branched macromolecules to an increasing extent with increasing content of reagents with respect to the polyolefin Differential scanning calorimetry shows that the amount of long-chain branching is responsible for a decrease of the melting temperature and an increase of the crystallization temperature These results confirm that the functionalization coagent and monomer can give large macromolecule structure changes which can be driven in different directions depending on feed composition (C) 2010 Society of Chemical Industr

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“…Crystallinity of UA-grafted PP is higher than pure PP, due to the nucleation effect of the side chains. [167] Grafting of UA onto an acrylonitrile-butadiene-styrene (ABS) terpolymer with BPO in 1,2-dichloroethane mainly occurs through reaction of UA homopolymer radicals with the butadiene moiety. The grafting degree (GD; moles of UA grafted per weight of ABS) is directly proportional to the monomer concentration up to 0.30 mol.…”

Section: Grafting Of Undecylenic Acid Onto Various Homo-and Copolymersmentioning

confidence: 99%

Undecylenic Acid: A Valuable and Physiologically Active Renewable Building Block from Castor Oil

2009

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A lot of attention is currently being paid to the transition to a biobased economy. In this movement, most efforts concentrate on the development of bioenergy applications including bioethanol, biodiesel, thermochemical conversion of biomass, and others. However, in the energy sector other nonbiomass alternatives are known, whereas no valuable alternatives are available when thinking about chemical building blocks. Therefore, it is also essential to develop new routes for the synthesis of bio-based chemicals and materials derived thereof. Such intermediates can originate either from plants or from animals. Castor oil is a non-edible oil extracted from the seeds of the castor bean plant Ricinus communis (Euphorbiaceae), which grows in tropical and subtropical areas. Globally, around one million tons of castor seeds are produced every year, the leading producing areas being India, PR China, and Brazil.2 10-Undecenoic acid or undecylenic acid is a fatty acid derived from castor oil that, owing to its bifunctional nature, has many possibilities to develop sustainable applications.

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Melt grafting of a long-chain unsaturated carboxylic acid onto polypropylene

Cited by 24 publications

References 16 publications

Chemical modification of styrene–butadiene–styrene co-polymer by grafting of N-carbamyl maleamic acid

Chemical modification of styrene–butadiene–styrene co-polymer by grafting of N-carbamyl maleamic acid

Structure and rheology of polypropylene with various architectures prepared by coagent‐assisted radical processing

Undecylenic Acid: A Valuable and Physiologically Active Renewable Building Block from Castor Oil

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