Toughening of electron-beam cured acrylate resins

Glauser, Thierry; Hult, Anders; Johansson, Mats; Kornmann, Xavier; Berglund, Lars A.

doi:10.1002/1439-2054(20000801)280:1<20::aid-mame20>3.0.co;2-8

Cited by 14 publications

(9 citation statements)

References 15 publications

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“…Several works have investigated the crosslinking mechanisms of both monomer and polymer solutions occurring upon irradiation and electron‐beam irradiation 7. 21–25 Knolle and co‐workers26 have synthesized crosslinked N ‐isopropylacrylamide (NIPAAm) in aqueous solution by electron‐beam radiation and suggest that the radicals were generated from water radiolysis. These radicals react with NIPAAm yielding different monomer radicals which can undergo polymerization, branching and finally crosslinking.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of polyelectrolyte hydrogels with controlled swelling behaviour

Atta

Arndt

2001

Polymer International

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Copolymerization of sulfopropyl methacrylate potassium salt (K-SPMA) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) has been studied in the range 10±90% K-SPMA in the feedstock. The reactivity ratios have been determined for K-SPMA/AMPS copolymers. The copolymer compositions, utilized for determining the reactivity ratio, have been determined from nitrogen content. Crosslinked poly(AMPS) and K-SPMA/AMPS copolymers were prepared in water in the presence of potassium persulfate as initiator and N,N-methylene bisacrylamide (MBA) as tetrafunctional crosslinker. Irradiation of K-SPMA and AMPS with an electron-beam was carried out at 50 wt% aqueous solution with low pH and irradiation dose 40±120 kGy. The swelling behaviour of highly crosslinked K-SPMA/AMPS copolymer polyelectrolyte gels in aqueous medium was studied in the presence of different types of salts. The crosslink density, the average molecular weight between the crosslinks and the dissociation constant (pK a ) of the crosslinked polymer were determined from stress± strain measurements.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of polyelectrolyte hydrogels with controlled swelling behaviour

Atta

Arndt

2001

Polymer International

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“…Additionally, HBPEs containing unsaturated groups and various lengths of alkyl chains were used as tougheners for electron beam-cured acrylatefunctionalized bisphenol A epoxide to obtain a liquid-liquid phase-separated resin, the toughness of the resin being improved with only a small detrimental effect on the thermomechanical properties. 139 In addition to the excellent toughness of thermoset epoxy resins described above, improving the properties of thermoplastic materials using HBPEs has also been widely reported. The tensile strength, elongation at break and recrystallization rate of poly(lactic acid) (PLA) were significant improved by incorporating HBPE, which was attributed to strong hydrogen bonds between HBPE and PLA at an appropriate HBPE content, and a certain crystallinity produced by nucleation of HBPE.…”

Section: Toughenersmentioning

confidence: 99%

“…The impact strength was two times higher than that of the neat epoxy, and the fracture surfaces of the modified system showed tough fracture features. Additionally, HBPEs containing unsaturated groups and various lengths of alkyl chains were used as tougheners for electron beam‐cured acrylate‐functionalized bisphenol A epoxide to obtain a liquid–liquid phase‐separated resin, the toughness of the resin being improved with only a small detrimental effect on the thermomechanical properties 139…”

Section: Applications Of Hbpesmentioning

confidence: 99%

Modifications and applications of hyperbranched aliphatic polyesters based on dimethylolpropionic acid

Zhang

2010

Polymer International

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Over the past 16 years, hyperbranched polyesters (HBPEs) based on dimethylolpropionic acid have received much attention due to their unique structural characters, their excellent physical and chemical properties as well as their potential applications in coatings, additives, drug delivery, composites, membrane science and supermolecular chemistry. HBPEs have recently become one of the types of commercialized hyperbranched polymers, and their modifications and applications are focuses of research. This paper reviews the developments in the modifications and applications of HBPEs. Copyright © 2010 Society of Chemical Industry

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“…Depending on curing conditions and on composition, the global effect may result from thermoplasticresin phase separation occurring before EB processing (Chauray et al, 2004). Some authors report that reaction-induced phase separation is not possible in EB since the cure process is too fast (Glauser et al, 2000). Therefore, common strategies for EB-cured materials attempt to decouple phase separation and curing processes to avoid this limitation.…”

Section: Toughened Eb-cured Matricesmentioning

confidence: 99%