Characterization of castor oil-based interpenetrating polymer networks of PU/PS

Siddaramaiah,; Mallu, P.; Somashekar, R.

doi:10.1002/(sici)1097-4628(19980613)68:11<1739::aid-app3>3.0.co;2-k

Cited by 35 publications

(23 citation statements)

References 4 publications

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“…Though voluminous literature is available on modified castor oil polyurethane, the study of IPNs of modified castor oil polyurethane has not been paid due attention [7,[9][10][11][12][13]. In the present study a family of simultaneous IPNs based on pentaerythritol modified castor oil and diphenylmethane 4-4 0 diisocyanate polyurethane (P-PU) and polystyrene (PS) were synthesized using benzoyl peroxide (PBO) as the initiator and divinyl benzene (DVB) as the crosslinker has been studied.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Interpenetrating Polymer Networks of Polyurethane from Pentaerythritol–Modified Castor Oil and Polystyrene: Structure–Property Relationships

Valero

Pulido

Ramírez

et al. 2009

J Americ Oil Chem Soc

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Castor oil was transesterified with pentaerythritol thereby introducing reactive hydroxyl groups. The method of matrix-assisted laser desorption/ionization timeof-flight mass spectroscopy was used to determine the components of the castor oil pentaerythritol alcoholysis products. Simultaneous interpenetrating polymer networks of pentaerythritol modified castor oil and diphenyl-methane 4-4 0 diisocyanate polyurethane (P1-CO-PU) and polystyrene (PS) were synthesized using benzoyl peroxide as the initiator and divinyl benzene as the crosslinker. The effect of PU/PS composition on the morphology, miscibility and physical properties of the resulting IPNs was investigated by scanning electron microscopy, dynamic mechanical thermal analysis, measurements of mechanical properties and resistance to chemical reagents. The patterns of the extent of the phase separation and the characteristics of the interpenetration reached as a function of the components were deduced.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Interpenetrating Polymer Networks of Polyurethane from Pentaerythritol–Modified Castor Oil and Polystyrene: Structure–Property Relationships

Valero

Pulido

Ramírez

et al. 2009

J Americ Oil Chem Soc

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“…Owing to easy synthesis and the versatile properties of PU, it is one of the most widely used polymer components in the synthesis of IPNs. Many investigators have studied the PU IPNs to improve PU properties 1–5. Recently, Kiguchi et al 6 studied the ideal simultaneous interpenetrating network formation via topological crosslinks between PU and polymethacrylate precursors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and properties of organoclay‐modified polyurethane/epoxy interpenetrating polymer network nanocomposites

Jia¹,

Zheng²,

Shen³

et al. 2005

Polymer International

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organoclay‐modified polyurethane/epoxy interpenetrating network nanocomposites (oM‐PU/EP nanocomposites) were prepared by adding organophilic montmorillonite (oMMT) to interpenetrating polymer networks (IPNs) of polyurethane and epoxy resin (PU/EP) which had been prepared by a sequential polymerization technique. Wide‐angle X‐ray diffraction (WAXD) and transmission electronic microscopy (TEM) analysis showed that the interpenetrating process of PU and EP improved the exfoliation and dispersion degree of oMMT. The effects of the NCO/OH ratio (isocyanate index), the weight ratio of PU/EP and oMMT content on the phase structure and the mechanical properties of the oM‐PU/EP nanocomposites were studied by tensile testing and scanning electronic microscopy (SEM). Water absorption tests showed that the PU/EP interpenetrating networks and oMMT had synergistic effects on improvement in the water resistance of the oM‐PU/EP nanocomposites. Differential scanning calorimetry (DSC) analysis showed that PU was compatible with EP and that the glass transition temperature (Tg) of the oM‐PU/EP nanocomposites increased with the oMMT content up to 3 wt%, and then decreased with further increasing oMMT content. The thermal stability of these nanocomposites with various oMMT contents was studied by thermogravimetric analysis (TGA), and the mechanism of thermal stability improvement was discussed according to the experimental results. Copyright © 2005 Society of Chemical Industry

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“…Such plastics may be toughened by the incorporation of judicious quantities of an elastomeric material like polyurethane. Polyurethane/ polystyrene interpenetrating polymer networks (IPNs) have been extensively studied by many researchers [10][11][12]25,[30][31][32][33][34]. Though castor oil, a renewable resource and a natural polyol, has been a successful candidate in the formation of industrially useful materials like cost-effective polyurethane elastomers, it is yet to be exploited for the modification of polymers.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Castor Oil and Diphenyl Methane Diisocyanate-based Polyurethane-Polystyrene Interpenetrating Networks

Singh

Kaushik

Gupta

2005

Journal of Reinforced Plastics and Composites

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Castor oil is an abundant natural polyol. It has been subjected to extensive investigations for polyurethane formation, suitable for a variety of applications. In this work, polyurethane prepolymers have been synthesized by bulk polycondensation of the moisture-free castor oil with diphenyl methane diisocyanate at room temperature. These prepolymers have been then cross-linked in situ with different quantities of styrene to prepare simultaneous interpenetrating polymer networks (IPNs). The composition of the polyurethane and polystyrene IPNs ranges from 10 to 50% by weight. The morphology, mechanical properties, chemical absorption, and swelling behavior of the IPNs prepared have been analyzed to evaluate the effect of styrene content in the IPNs. The tensile modulus improves with increasing quantity of styrene with a maximum at 50%. The absorption of these IPNs is maximum in pyridine and decreases with increasing quantity of styrene up to 40% and a sudden jump has been observed for 50% styrene content. For swelling study, the diffusivity coefficient increases with increasing PS content while sorption coefficient shows a decreasing trend.

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Characterization of castor oil-based interpenetrating polymer networks of PU/PS

Cited by 35 publications

References 4 publications

Simultaneous Interpenetrating Polymer Networks of Polyurethane from Pentaerythritol–Modified Castor Oil and Polystyrene: Structure–Property Relationships

Simultaneous Interpenetrating Polymer Networks of Polyurethane from Pentaerythritol–Modified Castor Oil and Polystyrene: Structure–Property Relationships

Synthesis, characterization and properties of organoclay‐modified polyurethane/epoxy interpenetrating polymer network nanocomposites

Characterization of Castor Oil and Diphenyl Methane Diisocyanate-based Polyurethane-Polystyrene Interpenetrating Networks

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