Nano-phase structures and mechanical properties of epoxy/acryl triblock copolymer alloys

Kishi, Hajime; Kunimitsu, Y.; Imade, Jin; Oshita, Shinya; Morishita, Yoshihiro; Asada, Mitsunori

doi:10.1016/j.polymer.2010.12.025

Cited by 84 publications

(48 citation statements)

References 29 publications

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“…The molecular weight of the acrylic BCPs and the composition (the ratio of the PnBA in the acrylic BCPs) were systematically controlled. The PnBA block chain is the segment which is immiscible with the PN-cured DGEBA type epoxy thermosets [30]. The characterization of the BCPs is shown in Table 1 in detail.…”

Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

“…The phase morphologies depended on the amount of the BCPs and the degree of epoxidation in the polybutadiene block. In our previous study [30], poly (methyl methacrylate)-b-poly(n-butyl acrylate)-b-poly(methyl methacrylate) (PMMA-b-PnBA-b-PMMA) triblock copolymers (acrylic BCPs) were synthesized via living anionic polymerization. The acrylic BCPs were blended with the epoxy using a wide range of curing agents.…”

Section: Introductionmentioning

confidence: 99%

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Control of nanostructures generated in epoxy matrices blended with PMMA-b-PnBA-b-PMMA triblock copolymers

Kishi¹,

Kunimitsu²,

Nakashima³

et al. 2015

Express Polym. Lett.

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Abstract. Stability of nanostructures of epoxy/acrylic triblock copolymer blends was studied. PMMA-b-PnBA-b-PMMA triblock copolymers (acrylic BCPs) having several compositions on the ratio of the block chains and the molecular weight were initially prepared and were blended with diglycidyl ether of bisphenol-A epoxy thermosets. The blends were cured using phenol novolac with tri phenyl phosphine (TPP) as the catalyst. Several nanostructures, such as spheres, cylinders, curved lamellae, were observed in the cured blends. The nanostructures were controlled by the molecular weight of the immiscible PnBA-block chain and the ratio of the PnBA in the blends. Moreover, the effect of the gel time to the nanostructures was examined by altering the trace amount of the TPP in the blends. The types of the nanostructures were almost kept irrespective of the gel time of the blends when the composition of the blends was maintained. This suggested the stability of the nanostructures of the epoxy/acrylic BCP blends made via the self-assembly mechanism, therefore a phase diagram of the cured blends was proposed.

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Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of nanostructures generated in epoxy matrices blended with PMMA-b-PnBA-b-PMMA triblock copolymers

Kishi¹,

Kunimitsu²,

Nakashima³

et al. 2015

Express Polym. Lett.

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“…The advantages of the block copolymers as a blend component with epoxy resins are extensively studied to improve the fracture toughness (Guo et al 2001, Kim et al 2001, Hydro & Pearson 2007, Liu et al 2009, 2009a, Kishi et al 2011. Thus, the block copolymers have been developed for the use as the chemical compatibilizers with epoxy resins.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

Pandit

Berkessel

Lach

et al. 2013

Nepal Journal of Science and Technology

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Polystyrene-polybutadiene block copolymers having different molecular architectures were epoxidized by using meta-chloroperoxybenzoic acid (MCPBA). Then, the blends with epoxy resin (diglycidyl ether of bisphenol-A; DGEBA) and their nanocomposites with boehmite and layered silicate nanofiller in presence of methylene dianiline (MDA) as a hardener were prepared. The epoxidized copolymers and the composites were characterized by Fourier transform infrared (FTIR) spectroscopy and microindentation technique. In this way, it was possible to tune the morphology of the nanostructured blends of the epoxy resin using the functionalized block copolymer as the template. The presence of nanostructured morphology was attested by the optical transparency of the blends as well as of the composites with nanofiller. The microhardness properties were improved by the incorporation of the nanoparticles, viz. boehmite and layered silicate.

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“…Logo após, lavou-se a mistura com as soluções de HCl 1 M (3 x 20 mL), NaHCO 3 saturada (1 x 15 mL), água destilada (1 x 15 mL) e, finalmente, NaCl saturado (1 x 20 mL). À solução orgânica adicionou-se Na 2 …”

Section: Procedimento De Síntese Representativo Para Os Monômeros 5a-dunclassified

“…Também são classificados em lineares ou ramificados, dependendo do arranjo da cadeia polimérica. 2 A reação de copolimerização é uma técnica importante que possibilita modular o polímero, através de modificações sistemá-ticas, agregando propriedades específicas, tornando-o comercial e tecnologicamente mais interessante e vantajoso. 3 Como exemplo, pode-se citar a quitina 4 e seu derivado, a quitosana.…”

Section: Introductionunclassified

Síntese e caracterização de copolímeros de cadeia lateral derivados de acrilatos de 4,5-di-hidroisoxazol e do (-)-mentol

Passo¹,

Merlo²,

Eccher³

et al. 2012

Quím. Nova

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Recebido em 28/10/11; aceito em 30/3/12; publicado na web em 10/7/12 SYNTHESIS AND CHARACTERIZATION OF COPOLYMERS 4,5-DIHYDROISOXAZOLE AND (-)-MENTHYL ACRYLATES. Five monomers 5-[4-(5-cyano-4,5-dihydroisoxazol-3-yl)phenoxy]undecyl acrylate (7a); n-alkyl 3-{4- [5-(acryloyloxyundecyl) oxyphenyl]}-4,5-dihydroisoxazole-5-carboxylate (7b,c for n-butyl and n-hexyl, respectively); 3-{4- [5-(acryloyloxyundecyl) oxyphenyl]}-4,5-dihydroisoxazole-5-carboxylic acid (7d) and (1R,2S,5R)-2-isopropyl-5-methylcyclohexyl acrylate (9) and the corresponding copolymers 10a-d, 11 and homopolymers 12 from 7a and 13 from 9 were designed and synthesized. Except for acrylate 9 which is derived from (-)-menthol, all of the monomers belong to the series containing the isoxazoline ring linked to the acrylate unit by a flexible spacer chain of eleven methylene units. They presented low glass temperature and despite birefringence behavior, these copolymers showed no mesomorphic properties.Keywords: 3,5-disubstituted isoxazolines; copolymers; menthyl acrylate. INTRODUÇÃOCopolímeros são macromoléculas compostas por duas ou mais unidades estruturais diferentes, que podem se distribuir estatisticamente entre si ou de forma a gerar segmentos ou blocos. 1 Podem ser classificados quanto à forma, tendo como base a organização das unidades ao longo da cadeia polimérica, em alternados, periódicos, estatísticos, aleatórios ou em blocos. Também são classificados em lineares ou ramificados, dependendo do arranjo da cadeia polimérica. 2 A reação de copolimerização é uma técnica importante que possibilita modular o polímero, através de modificações sistemá-ticas, agregando propriedades específicas, tornando-o comercial e tecnologicamente mais interessante e vantajoso. 3 Como exemplo, pode-se citar a quitina 4 e seu derivado, a quitosana. Esses são poliaminossacarídeos que têm uma vasta aplicação no campo biomédico. No entanto, esses polímeros naturais mostram algumas desvantagens no uso comercial, por serem insolúveis nos principais solventes utilizados cotidianamente. A fim de superar esse problema pode-se copolimerizar o poliaminossacarídeo com monômeros vinílicos produzindo copolímeros multifuncionais, alterando desta forma as propriedades físico-químicas do polímero natural. Os copolímeros são utilizados de forma bastante diversificada em pervaporação organofílica, 5 formulações para recuperação de óleos terciários, projetos hidráulicos, 6 microgéis inteligentes com aplicação em diversas áreas, tais como transportadores de medicamentos, sensores, separadores químicos e imobilizadores de enzimas. 7 Na área de cristais líquidos, a copolimerização é uma ferramenta importante para preparação de novos materiais que apresentam as propriedades mesogênicas combinadas com as dos materiais poliméricos relacionadas com elasticidade, processabilidade, formação de filmes, confinamento, entre outras. 8 Neste contexto, estamos interessados na síntese e caracterização de novos materiais líquido-cristalinos contendo anéis heterocíclicos, em particular, os anéis "pri...

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Nano-phase structures and mechanical properties of epoxy/acryl triblock copolymer alloys

Cited by 84 publications

References 29 publications

Control of nanostructures generated in epoxy matrices blended with PMMA-b-PnBA-b-PMMA triblock copolymers

Control of nanostructures generated in epoxy matrices blended with PMMA-b-PnBA-b-PMMA triblock copolymers

Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

Síntese e caracterização de copolímeros de cadeia lateral derivados de acrilatos de 4,5-di-hidroisoxazol e do (-)-mentol

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