Gel point prediction of metal‐filled castor oil‐based polyurethanes system

Srivastava, A. K.; Singh, Paramjit

doi:10.1002/pat.274

Cited by 15 publications

(9 citation statements)

References 22 publications

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“…It's supposed that gel time can be used to estimate the proper temperature of synthesis. 3 , and glass powder) systems, they stated that the gel time decreases as the percent filler loading is increased and they attributed it to the increased surface area made available for the curing mass with the progressive addition of the filler which is similar to that reported by Rao and Pourassamy [4]. In the present work, Isothermal system was applied to study the effect of milled fiber glass loading on the gel time individually.…”

Section: Introductionsupporting

confidence: 77%

Effect of Polyol/Di-Isocyanates Concentration and Temperature on the Synthesis of Polyurethane Foam

Ahmed¹,

Arabia²

2014

IJETT

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Abstract-A number of polyurethanes (PUs) from renewable resource e were synthesized by reacting castor oil with polymeric 4,4 diphenylmethane diisocynate (PMDI). Different NCO/OH ratios such as 1.2, 1.5, 1.8 and 2 was applied. Preparation of polyurethane werecarried out at 17, 30, 40, 50, 65 and 72 oC for each NCO/OH ratio. Milled fiber glass with average size 200 µm was dispersed in the pre-polymer with weight fractions 5 up to 50% by intense mixing (1000 rpm) in open and isothermal systems in order to study the effect of the filler contents on the gel time. The results showed that both of the temperature and the NCO/OH ratio have a significant effect on the gel time. Filler loading showed no significant effect on the gel time of the isothermal system. Predictable gel time model which is function in the temperature and NCO/OH ratio was achieved. This model can play an important role to estimate the safe conversion for reactor operation and the cycle time during the polyurethane production.

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Section: Introductionsupporting

confidence: 77%

Effect of Polyol/Di-Isocyanates Concentration and Temperature on the Synthesis of Polyurethane Foam

Ahmed¹,

Arabia²

2014

IJETT

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“…Several studies have been reported in the literature on the gelation time phenomenon of polyurethanes. [15][16][17][18][19] Regarding CO-based thermosets, Srivastava et al (2002) predicted the gel point of metal-filled CO-based polyurethanes. It was found that an increase in the process temperature, hydroxyl content or polyol functionality, or also the decrease of aluminium powder content, decreased the gelation time.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that an increase in the process temperature, hydroxyl content or polyol functionality, or also the decrease of aluminium powder content, decreased the gelation time. [20] On the same scheme, Yeganeh et al (2006) prepared polyhydroxyl compounds (PHC) via transesterification of poly(ethylene terephthalate), poly-(ethylene glycol)s and CO. Measurements showed that, with decreasing PHC hydroxyl content, the crosslink density decreased. As expected, the tensile strength and elongation at break decreased with increasing crosslink density.…”

Section: Introductionmentioning

confidence: 99%

Polyurethanes Based on Castor Oil: Kinetics, Chemical, Mechanical and Thermal Properties

Hablot

Zheng

Bouquey

et al. 2008

Macro Materials & Eng

206

117

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Polyurethanes based on vegetable oil were synthesized with castor oil and toluene diisocyanate, isophorone diisocyanate or hexamethylene diisocyanate, using dibutyltin dilaurate as a catalyst. The effects of the nature of the diisocyanate on the evolution of the kinetics, as well as the physical and mechanical properties and the thermal stability, of the different synthesized polyurethanes were investigated, and these complement data from the literature on equivalent systems. The polymerization kinetics, degree of swelling and mechanical properties were greatly affected by the diisocyanate nature, whereas the rheological properties and thermal stability were found to be similar for all polyurethanes.magnified image

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“…[10] Srivastava and co-workers showed gel point prediction of metal-filled castor oil based polyurethanes system. [11] Thames et al examined cationic ultraviolet curable coatings from castor oil glycidyl ether and epoxy Summary: Biobased epoxy materials were prepared from diglycidyl ether of bisphenol A (DGEBA) and epoxidized castor oil (ECO) initiated by a latent thermal catalyst. The physicochemical and mechanical interfacial properties of the DGEBA/ECO blends were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Biodegradable Epoxidized Castor Oil on Physicochemical and Mechanical Properties of Epoxy Resins

Park¹,

Jin²,

Lee³

2004

Macro Chemistry & Physics

163

129

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Summary: Biobased epoxy materials were prepared from diglycidyl ether of bisphenol A (DGEBA) and epoxidized castor oil (ECO) initiated by a latent thermal catalyst. The physicochemical and mechanical interfacial properties of the DGEBA/ECO blends were investigated. As a result, the thermal stability of the cured epoxy blends showed a maximum value in the presence of 10 wt.‐% ECO content, which was attributed to the excellent network structure in the DGEBA/ECO blends. The storage modulus and glass transition temperature of the blends were lower than those of neat epoxy resins. The mechanical interfacial properties of the cured specimens were significantly increased with increasing the ECO content. This could be interpreted in terms of the addition of larger soft segments of ECO into the epoxy resins and thus reducing the crosslinking density of the epoxy network, which results in increasing toughness in the blends.KIC values of the DGEBA/ECO blends as a function of ECO content.magnified imageKIC values of the DGEBA/ECO blends as a function of ECO content.

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Gel point prediction of metal‐filled castor oil‐based polyurethanes system

Abstract: Gel Point Prediction of Metal-®lled Polyurethanes / 1057 FIGURE 3. Effect of ®ller on gel time at 30°C.

Cited by 15 publications

References 22 publications

Effect of Polyol/Di-Isocyanates Concentration and Temperature on the Synthesis of Polyurethane Foam

Effect of Polyol/Di-Isocyanates Concentration and Temperature on the Synthesis of Polyurethane Foam

Polyurethanes Based on Castor Oil: Kinetics, Chemical, Mechanical and Thermal Properties

Effect of Biodegradable Epoxidized Castor Oil on Physicochemical and Mechanical Properties of Epoxy Resins

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