Thermal behavior of core-shell rubber/styrene monomer gels

Roberts, K; Simon, George P.; Cook, Wayne D.; Burchill, P. J.

doi:10.1002/1099-0488(20001201)38:23<3136::aid-polb140>3.0.co;2-s

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…Besides physical gelators, specially formulated in situ cured polymers have emerged as potential chemical gelators with relatively simple application procedures. There is a vast amount of literature on cross‐linked network polymers, but it is only recently that an attempt has been directed to confine large amounts of solvent using chemical gel networks 36–39. It is well known that the swelling of a preformed network polymer with a solvent results in a network with different physical properties compared to a network polymer actually polymerized (or cross‐linked) in situ in the solvent 40–43.…”

Section: Introductionmentioning

confidence: 99%

Benzene physical and chemical organogels: Effect of network scaffolding on the thermodynamic behavior of entrapped solvent molecules

Markovic¹,

Ginic‐Markovic²,

Dutta³

2004

J of Applied Polymer Sci

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This paper presents a thermodynamic investigation of the benzene physical and chemical organogels, using differential scanning calorimetry (DSC) and intends to draw an appropriate relationship between the gel network structure and the properties. Physical gels, formed by an aluminium soap of fatty acid, and chemical gels, created by in situ cross-linking of a siloxane copolymer are investigated. The effects of the type and quantity of the gelators and their corresponding network mesh size distribution in the gels on crystallization, melting, and their kinetics are examined. It appears that the kinetics of crystallization of the entrapped solvent is significantly affected by the quality of the gel network scaffolding and can be treated successfully by the Avrami equation of crystallization. From the melting behavior of the entrapped solvent crystallites, quantitative information about the number of solvent molecules bound per molecule of the gelator has been extracted. DSC proves to be a reliable technique to evaluate the population distribution of solvent molecules trapped in the physical and chemical organogel network scaffolding. The state of the solvent may be treated as a probe to understand the structure of the gels.

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Section: Introductionmentioning

confidence: 99%

Benzene physical and chemical organogels: Effect of network scaffolding on the thermodynamic behavior of entrapped solvent molecules

Markovic¹,

Ginic‐Markovic²,

Dutta³

2004

J of Applied Polymer Sci

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“…The nature of the solvent changes the ratios of inter‐and intra‐molecular bonds, and exerts a substantial effect on the structure and elastic properties of the gels. Besides limited work on aqueous gels from various synthetic polymers and/or biopolymers probed for their thermal characteristics and behaviour, very limited research on the thermodynamics and kinetics of hydrocarbon‐based gels has been published 32…”

Section: Introductionmentioning

confidence: 99%

Mechanism of solvent entrapment within the network scaffolding in organogels: thermodynamic and kinetic investigations

Markovic

Ginic‐Markovic

Dutta

2003

Polymer International

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A detailed investigation on the thermodynamic behaviour of the physical and chemical organogels, using differential scanning calorimetry (DSC) and modulated thermogravimetric analysis (MTGA), is presented. Aluminium soap of fatty acid was used as the physical gelator and in situ crosslinking of siloxane copolymer was used for chemical gelation. The effects of the type and concentration of the gelators and the corresponding mesh‐size distribution of the gel network scaffolding on the trapped‐solvent crystallization, melting and evaporation mechanism, and kinetics are examined. It appears that the kinetics of crystallization of the trapped‐solvent are significantly affected by the quality of the gel network scaffolding and can be treated successfully by the Avrami equation of crystallization. From the melting behaviour of the entrapped‐solvent crystallites, quantitative information about the number of solvent molecules bound per molecule of the gelator has been extracted. The effect of gelation network structure on the kinetics of evaporation of the solvent from the gel network scaffolding has been evaluated. DSC appears to be the reliable technique to evaluate the population distribution of solvent molecules trapped in the gel network scaffolding. Copyright © 2003 Society of Chemical Industry

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“…where w s is the weight percentage of the swelling agent (%), T g,PPO and T g,s are the glass transition temperatures of PPO and the swelling agent, respectively. According to references, T g,PPO is 2108C [11], and T g,s of chloroform, toluene, and styrene are 1688C [19], 1608C [20], and 1238C [21], respectively. The correlation coefficients (R 2 ) between the experimental data measured by DSC and the result fitted by Fox equation for the mixtures of PPO with chloroform, toluene, and styrene are 0.98, 0.98, and 0.96, respectively, indicating that the relation between T g of the PPO/swelling agent mixture and the swelling agent content obeys Fox equation.…”

Section: Effect Of the Swelling Agent On T G Of The Ppo/swelling Agenmentioning

confidence: 99%

Effect of swelling agent on the molecular weight of poly(2,6‐dimethyl‐1,4‐phenylene oxide) synthesized in an aqueous medium

Liu

Shentu

Wang

2008

Polymer Engineering & Sci

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The effects of the species and content of a swelling agent on the molecular weight of poly(2,6-dimethyl-1,4phenylene oxide) (PPO) synthesized in an aqueous medium were studied. It was found that the molecular weight of PPO increases after introducing a certain amount of the swelling agent during the oxidative polymerization of 2,6-dimethylphenol (DMP). T g of the PPO/ swelling agent mixture decreases with the increase of the swelling agent content, and the relation between T g of the PPO/swelling agent mixture and the swelling agent content obeys Fox equation. After the introduction of the swelling agent during the oxidative polymerization of DMP, the molecular weight of PPO is correlated with T g of the PPO/swelling agent mixture and it was revealed that T g plays an important role in the molecular weight of PPO synthesized in the aqueous medium. The same molecular weight of PPO can be obtained only if T g of the PPO/swelling agent mixture is the same, no matter what kind of swelling agent is introduced during the oxidative polymerization of DMP.

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Thermal behavior of core-shell rubber/styrene monomer gels

Cited by 11 publications

References 25 publications

Benzene physical and chemical organogels: Effect of network scaffolding on the thermodynamic behavior of entrapped solvent molecules

Benzene physical and chemical organogels: Effect of network scaffolding on the thermodynamic behavior of entrapped solvent molecules

Mechanism of solvent entrapment within the network scaffolding in organogels: thermodynamic and kinetic investigations

Effect of swelling agent on the molecular weight of poly(2,6‐dimethyl‐1,4‐phenylene oxide) synthesized in an aqueous medium

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