Cure kinetics and modeling the reaction of silicone rubber

Hong, In-Kwon; Lee, Sang-Mook

doi:10.1016/j.jiec.2012.05.006

Cited by 65 publications

(35 citation statements)

References 24 publications

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“…This result indicates that crosslinking inhibition in our AgNW-PDMS composites is not a chemical effect. Hence, we infer that the curing reaction rate is dependent on the number of polymers available for crosslinking, captured in a pre-exponential term P. If we consider a non-autocatalytic rate equation of the form b da dT ¼ Pe À Ea RT ð1 À aÞ n , where a is the reaction completion fraction estimated from the exotherm peak area, our data fits well with a second order reaction, 26 i.e., n ¼ 2. From the ordinate intercepts of the semi-log plot of the rate equation at various a, we obtain an average 27 P $ 13 Â 10 9 s À1 for both unfilled PDMS and AgNC-PDMS.…”

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confidence: 63%

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Softening in silver-nanowire-filled polydimethylsiloxane nanocomposites

Seshadri

Esquenazi

Borca-Tasciuc

et al. 2014

Applied Physics Letters

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We report that silver nanowire fillers can result in a three-fold decrease in viscoelastic storage modulus of polydimethylsiloxane composites above a low critical filler fraction of ∼0.5%, contrary to theoretical predictions presaging a modulus increase. Similar fractions of silver nanocube fillers result in no such observable effects. Rheology measurements and calorimetric kinetics analyses reveal that high surface area nanowire filler percolation curtails macromolecular mobility via pre-cure gelation, and hinders crosslinking. Our findings on the effect of metal filler aspect ratio on polymer stiffness at low loading fractions would be important for designing nanocomposites for applications.

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confidence: 63%

“…5(b) and 5(c)). From Kissinger analysis, 26 we extract an activation energy E a ¼ 0.77 eV/crosslink from the slope of the 1/T p vs. b / T p 2 plot ( Fig. 6(a)) for all our composites irrespective of filler shape or fraction.…”

mentioning

confidence: 99%

Softening in silver-nanowire-filled polydimethylsiloxane nanocomposites

Seshadri

Esquenazi

Borca-Tasciuc

et al. 2014

Applied Physics Letters

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“…During the crosslinking reaction of silicone rubbers, the reaction rate dα/dt is assumed to be a linear function of the rate constant k(T) and a function of the vulcanization degree f(α) [4]:…”

Section: Theoreticalmentioning

confidence: 99%

Determination of the activation energy of silicone rubbers using different kinetic analysis methods

Sahli

Barrière

et al. 2016

MATEC Web Conf.

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The solidification of silicone rubbers is a crosslinking reaction called vulcanization. It follows that the physical and mechanical properties of silicone rubbers increase significantly due to the growth of molecular weight and were affected strongly by the vulcanization process, such as the temperatures and times for curing. In this study, the kinetics of the crosslinking reaction of silicone rubbers was investigated by two current techniques: differential scanning calorimeter (DSC) and oscillating disk rheometry (ODR). From the kinetic experimental data, different kinetic analysis methods were used to determine the activation energy of silicone rubbers, such as the Kissinger, the Ozawa, the Friedman, the Flynn-Wall-Ozawa, the Kissinger-Akahira-Sunose and the integral methods. The results show the influence of the chemical composition of silicone rubbers, the current technique used and the applied kinetic analysis methods on the activation energy and the evolution of activation energy during the cr osslinking reaction.

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“…The vulcanization process has a crucial influence on the performance and quality of the final silicone rubber products. For curing of silicone rubber peroxide and platinium catalysis are commonly used [14]. In this paper commercially available fumed silicas with different surface characteristics and surface area were selected as reinforcing fillers.…”

Section: Introductionmentioning

confidence: 99%

“…According to the literature the allylisobutyl-POSS, because of the steric hindrance of the molecule, mainly participate in grafting reaction [15]. The current methods to investigate the curing of a silicone materials are differential scanning calorimetry (DSC), an oscillating disc rheometer (ODR) and a moving die rheometer (MDR) [14]. A parameter known as the cure degree (cure rate) is defined and plotted versus time to describe the temporal behavior of the curing reactions [16].…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Behavior, Curing and Reinforcement Mechanism of Various Silica and POSS Filled Methyl-Vinyl Polysiloxane MVQ Rubber

Lipińska

Soszka

2019

Silicon

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The role of Aerosil silicas, A90, R812, R812s on the complex dynamic viscosity η * of methyl-vinyl polysiloxane MVQ at processing temperature 80°C was analyzed based on experiments with a torsional rheometer Rubber Process Analyzer RPA. The influence of surface area and surface activity on the Payne's effect was determined by oscillating rheometer Ares G2. The decrease in complex modulus G * by increasing strain for silicas R812, R812s was mostly due to the breaking down of fillerfiller networking, the modification of surface led to better processability resulting in the increase of tensile strength TS, from 0.42 MPa unfilled silicone to 9.31 MPa MVQ containing R812. Higher surface activity of silica A90 caused a decrease in filler networking due to a better filler-polymer interactions, which resulted in the increase of the percentage of non-covalent crosslinks determined for samples treated with ammonia. The decrease of static water contact angle θ of silicone rubber after incorporation of A90 was observed. Influence of allylisobutylPOSS on curing, crosslink density, static and dynamic behavior of silicone rubber was considered.

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Cure kinetics and modeling the reaction of silicone rubber

Cited by 65 publications

References 24 publications

Softening in silver-nanowire-filled polydimethylsiloxane nanocomposites

Softening in silver-nanowire-filled polydimethylsiloxane nanocomposites

Determination of the activation energy of silicone rubbers using different kinetic analysis methods

Viscoelastic Behavior, Curing and Reinforcement Mechanism of Various Silica and POSS Filled Methyl-Vinyl Polysiloxane MVQ Rubber

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