High molecular weight poly(?-methylstyrene) formed by free radical polymerization in emulsions

Pilcher, Spence C.; Ford, Warren T.

doi:10.1002/1099-0518(20010215)39:4<525::aid-pola1022>3.0.co;2-v

Cited by 4 publications

(1 citation statement)

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“…α‐Methylstyrene (AMS) is an electron‐donating vinyl monomer and readily available. Because the free radical polymerization of AMS has a ceiling temperature of 61°C in bulk and a high chain transfer constant to monomer, it gives low monomer conversion and molecular weight under conventional bulk conditions [16–18]. However, recent researches indicate that the copolymerization of AMS with other monomers can get favorable kinetics [18–22].…”

Section: Introductionmentioning

confidence: 99%

Melt grafting of maleic anhydride onto polypropylene with assistance of α‐methylstyrene

Luo

Liu

2011

Polymer Engineering & Sci

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Melt grafting of maleic anhydride (MA) and α‐methylstyrene (AMS) onto polypropylene (PP) was performed by reactive extrusion. Effects of AMS on the graft degree of MA, crystallization behavior, and thermal properties of the graft copolymer were investigated. Results show that the addition of AMS as a comonomer can efficiently improve the MA graft degree. When the molar ratio of AMS to MA is 0.9:1, the maximum MA graft degree is attained, which increases about 56% compared with that using single monomer of MA. The results of the graft degree of MA obtained by chemical titration (CT) agree well with those obtained by Fourier transform infrared spectroscopy (FTIR). Melt flow rate (MFR) measurements indicate that the addition of AMS effectively reduces the degradation of PP molecules. The wide‐angle X‐ray diffraction (WAXD) results show that in comparison with the PP‐g‐MA sample, the PP‐g‐(MA‐AMS) sample shows no new crystalline form, but has a slight decrease in the average crystalline domain size. According to the results of thermogravimetry (TG) and differential scanning calorimetry (DSC), the graft PP in the presence of AMS exhibits a lower melting point and a higher crystallization temperature and thermal stability in comparison with that without AMS. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Melt grafting of maleic anhydride onto polypropylene with assistance of α‐methylstyrene

Luo

Liu

2011

Polymer Engineering & Sci

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Polymer Design Strategies for Radiation‐Grafted Fuel Cell Membranes

Gubler

2013

Advanced Energy Materials

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In the past decade, fuel cell technology has been moving steadily towards commercialization, with prospects of high production volumes, in particular in electric vehicle applications. However, the cost and durability of the currently‐used materials and components fall short of the requirements for large‐scale industrialization. The development of alternative, more cost‐effective materials with competitive performance and durability attributes is therefore ongoing. Radiation‐induced graft copolymerization (“radiation grafting”) is a versatile method to modify pre‐existing polymers to introduce a variety of desired functionalities, such as ion‐exchange capacity. Here, an overview of fundamentals and recent developments in the area of radiation grafted ion‐conducting polymers for application in polymer electrolyte fuel cells (PEFCs) is provided. Key aspects of polymer design are discussed, taking into consideration the radiation chemistry of base polymer materials and the adequate choice of grafting monomers for different PEFC types. Furthermore, the current status of applications in fuel cells is highlighted.

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Radiation grafted fuel cell membranes based on co-grafting of α-methylstyrene and methacrylonitrile into a fluoropolymer base film

Gubler¹,

Slaski²,

Wallasch³

et al. 2009

Journal of Membrane Science

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High molecular weight poly(?-methylstyrene) formed by free radical polymerization in emulsions

Cited by 4 publications

References 13 publications

Melt grafting of maleic anhydride onto polypropylene with assistance of α‐methylstyrene

Melt grafting of maleic anhydride onto polypropylene with assistance of α‐methylstyrene

Polymer Design Strategies for Radiation‐Grafted Fuel Cell Membranes

Radiation grafted fuel cell membranes based on co-grafting of α-methylstyrene and methacrylonitrile into a fluoropolymer base film

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