Molecular mobility in epoxidized butadiene/styrene triblock copolymer

Malhotra, Indu; Zuchowska, Danuta; Hruszka, P.; Jurga, J.

doi:10.1016/0032-3861(89)90015-3

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Synthesis of PB-E (1) (Epoxidation). The epoxidation reaction was performed and modified according to the literature procedure, , and here PB with 5 mol % degree of modification is highlighted as a typical example. In a 1 L one-neck round-bottom flask equipped with magnetic stirrer, 16.2 g of CB 10 (0.3 mol of CC) was first dissolved in 600 mL of THF (typical concentration for various degrees of modification).…”

Section: Methodsmentioning

confidence: 99%

A Simple Pathway toward Quantitative Modification of Polybutadiene: A New Approach to Thermoreversible Cross-Linking Rubber Comprising Supramolecular Hydrogen-Bonding Networks

Peng

Abetz

2005

Macromolecules

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A commercial polybutadiene (PB) was modified by a simple three-step polymer analogous reaction (epoxidation, oxirane ring-opening, and sulfonyl isocyanate addition), and the degree of modification is quantitatively controlled by epoxidation reaction. Because of the introduction of sulfonyl urethane groups (−O−CO−NH−SO2−) which is prone to self-complementary thermoreversible supramolecular hydrogen-bonding (HB) networks, the PB was modified from a rubbery material to a thermoplastic elastomer. The modified rubbers were characterized by using 1H NMR, FTIR, DSC, and dynamic mechanical analyses. FTIR spectra showed a shift of SO stretching to lower frequency with increasing degree of modification as a result of the formation of HB complexes. DSC analysis showed that the crystalline melting was suppressed, and the glass transition was elevated to higher temperatures. From the dynamic mechanical analysis it revealed much clearer the crystallization suppression and the glass transition shifts. The changes in thermal and mechanical properties were attributed to the formation of HB supramolecular networks in the modified polybutadienes.

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Section: Methodsmentioning

confidence: 99%

A Simple Pathway toward Quantitative Modification of Polybutadiene: A New Approach to Thermoreversible Cross-Linking Rubber Comprising Supramolecular Hydrogen-Bonding Networks

Peng

Abetz

2005

Macromolecules

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“…The PS block is immiscible with epoxy systems [13] whilst the PB block can be chemically functionalized for compatibilization with the thermosetting system. Whereas several studies have reported the synthesis of epoxidized PS-b-PB block copolymers, [14][15][16][17][18][19][20] their ability to act as templates of nanostructured epoxy resins has not been reported yet. This work presents a systematic method for the preparation of nanostructured epoxy systems modified by an epoxidized PS-b-PB block copolymer.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Thermosetting Systems from Epoxidized Styrene Butadiene Block Copolymers

Serrano

Martín

Tercjak

et al. 2005

Macromol. Rapid Commun.

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Summary: Nanostructured thermosetting materials were prepared by modification of an epoxy resin with 30 wt.‐% epoxidized polystyrene‐block‐polybutadiene copolymer (PS‐b‐PepB). The copolymer self‐assembles into a well‐defined hexagonal nanoordered structure, of around 30‐nm diameter, thus establishing its use as structure‐directing agent to generate nanostructured thermosetting materials. The study confirms pathways towards tailoring interactions between thermosetting matrices and immiscible block copolymers by using the concept of functionalization to build nanostructured polymer matrices.Structure of diglycidyl ether of bisphenol‐A/4,4′‐methylenebis(3‐chloro 2,6‐diethylaniline) cured blend containing 30 wt.‐% PS‐b‐PepB61 block copolymer.magnified imageStructure of diglycidyl ether of bisphenol‐A/4,4′‐methylenebis(3‐chloro 2,6‐diethylaniline) cured blend containing 30 wt.‐% PS‐b‐PepB61 block copolymer.

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“…A three-unit epoxide ring statistically distributed in a polybutadiene chain causes an increase in the cohesion energy and in the chain's rigid-ity, as indicated by an increase in the glass temperature of the PB block [2,3]. A three-unit epoxide ring statistically distributed in a polybutadiene chain causes an increase in the cohesion energy and in the chain's rigid-ity, as indicated by an increase in the glass temperature of the PB block [2,3].…”

Section: Introductionmentioning

confidence: 99%

Small-angle x-ray scattering studies on epoxidized butadiene-styrene block copolymers

Włochowicz

Ślusarczyk

Zuchowska

et al. 1990

Colloid & Polymer Sci

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Small-angle x-ray scattering (SAXS) and scanning electron microscopy (SEM) investigations for epoxidized butadiene-styrene (BS) block copolymers were performed. For unepoxidized copolymers, the SAXS curve exhibits a maximum which indicates that the copolymer has heterogeneity domain morphology. Using the standard theory for a two-phase system, mean distances between domains, the correlation length lp, and the thickness of the phase boundary were calculated from the SAXS data. It was found that the epoxidation of BS copolymers decreases the ability of the copolymer to separate the individual components. As the content of the epoxide groups increases, the dimensions of the domains decrease until they disappear, the boundary between domains and the matrix becomes less and less definite, and the copolymer composes a homogeneous system. The disappearance of the two-phase structure of the BS copolymers indicates an increase in the compatibility of polystyrene and epoxidized polybutadiene. According to the method of Van Krevelen, the solubility parameters of polystyrene and epoxypolybutadiene were calculated. Small differences between these parameters support the conclusions drawn from the SAXS investigations

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Molecular mobility in epoxidized butadiene/styrene triblock copolymer

Cited by 6 publications

References 12 publications

A Simple Pathway toward Quantitative Modification of Polybutadiene: A New Approach to Thermoreversible Cross-Linking Rubber Comprising Supramolecular Hydrogen-Bonding Networks

A Simple Pathway toward Quantitative Modification of Polybutadiene: A New Approach to Thermoreversible Cross-Linking Rubber Comprising Supramolecular Hydrogen-Bonding Networks

Nanostructured Thermosetting Systems from Epoxidized Styrene Butadiene Block Copolymers

Small-angle x-ray scattering studies on epoxidized butadiene-styrene block copolymers

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