Interpenetrating polymer networks from castor oil-based polyurethane and polystyrene

Siddaramaiah,; Mallu, P.; Varadarajulu, A.

doi:10.1016/s0141-3910(98)00110-4

Cited by 27 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For 50% polystyrene content, there was a sudden jump in absorption value and this was even more than pure polyurethane. The results were similar to those obtained by Siddaramaiah et al [29].…”

Section: Chemical Absorptionsupporting

confidence: 92%

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

Singh

Kaushik

Gupta

2005

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

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.

show abstract

Section: Chemical Absorptionsupporting

confidence: 92%

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

Singh

Kaushik

Gupta

2005

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

show abstract

“…The theoretical swelling degree of the IPN was calculated from the swelling data of the individual networks, using the swelling degree by weight, rather than by volume, because of weight-conservation between individual polymers and polymers in the IPN form by the relation [13]:…”

Section: Characterization Of Ipnsmentioning

confidence: 99%

“…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

View full text Add to dashboard Cite

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.

show abstract

“…The unique feature of castor oil is that it contains a considerable amount of hydroxylated triacylglycerols, which are important starting materials in oil and polymer chemistry. The hydroxyl groups are important from the polyurethane viewpoint, where esterification can play an important role in establishing the structure-property relationship [16]. The disadvantages of castor oil include: low hydroxyl number leading to low modulus material sluggish rate of curing of secondary hydroxyl groups [9], and structural irregularity due to steric hindrances offered by the long pendant fatty acid chains during polyurethane formation, resulting in low tear strength [17].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Reaction of Castor Oil Trimethylol Propane Polyol and 4,4′ Diphenyl Methane Diisocyanate

Kaushik

Singh

2008

International Journal of Polymeric Materials

View full text Add to dashboard Cite

The kinetics of the uncatalyzed reaction of diphenyl methane diisocyanate and castor oil (CO)=trimethylol propane (TMP) polyol, with xylene as solvent at different temperatures, solvent concentration and NCO=OH ratios were investigated. The polyol was synthesized from castor oil and trimethylol propane (2-ethyl-2-(hydroxymethyl)-1,3-propanediol) with equivalent ratio of 1:3 via transesterification mechanism. Polyol was then characterized using FTIR spectroscopy and liquid chromatography mass spectroscopy (LCMS) under atmospheric pressure chemical ionization mode. All the reactions obeyed second order kinetics. Enthalpy changes, activation energies and entropies of activation were also calculated. Kinetic data from these reactions will facilitate modeling of these reactions in a batch reactor.

show abstract

Interpenetrating polymer networks from castor oil-based polyurethane and polystyrene

Cited by 27 publications

References 16 publications

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

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

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

Kinetics of Reaction of Castor Oil Trimethylol Propane Polyol and 4,4′ Diphenyl Methane Diisocyanate

Contact Info

Product

Resources

About