Polymers from renewable resources. I. Castor oil‐based interpenetrating polymer networks: Thermal and mechanical properties

Abstract

A number of polyurethanes (PUs) were synthesized by reacting castor oil with toluene‐2,4‐diisocyanate and hexamethylene diisocyanate and varying the NCO/OH ratio. All these polyurethanes were reacted with some acrylic monomers like ethyl acrylate, n‐butyl acrylate, ethyl methacrylate, and butyl methacrylate using a crosslinker ethylene glycol dimethyl‐acrylate and benzoyl peroxide as the initiator. The physicochemical properties of interpenetrating polymer networks (IPNs) are reported. Thermogravimetric analysis was used to study the thermal behavior of IPNs and the evaluation of kinetic parameters. Degradation mechanism has also been investigated. Some of the mechanical properties viz. tensile strength, shore‐A hardness, elongation at break, etc. are also reported. © 1993 John Wiley & Sons, Inc.

Polymers from renewable resources. XIII. Interpenetrating polymer networks derived from castor oil–hexamethylene diisocyanate and polymethacrylamide

“…Refined castor oil was used without any purification. Its characteristic values such as hydroxyl number, acid number, and isocyanate equivalent were determined by standard procedures 6. The chemicals used in the investigation were analytical grade.…”

“…Recently, we reported the synthesis and characterization of some IPNs from castor oil using a multitude of vinyl monomers 6–10. This communication presents the thermal properties of IPNs prepared from castor oil–hexamethylene diisocyante (HMDI) and methacrylamide (MAM) as the monomer.…”

Chemistry of lignin-based materials

“…There are numerous classes of polymers made from natural resources. Typically, these include vegetable-oil-based polymers, [6][7][8] poly(lactic acid), [9][10][11] poly(hydroxybutyrate), [12][13][14] poly(butylenesuccinate), 15 poly(3-hyd roxybutyrate-co-hydroxyvalerate), 16,17 poly(hydroxyalkanoates), 18 cellulose, [19][20][21][22][23] starch, [24][25][26][27][28] chitin 29 and lignin. Lignin is one of the most promising due to its suffi cient supply, low cost and biodegradability.…”

Controlled release of 5-flurouracil from biomedical polyurethanes

“…Thus, castor oil acts as a polyol which reacts with polyfunctional isocyanates to form polyurethanes whose properties range from rigid polymers to elastomers. 18,19 The oil contains mainly esters of 12-hydroxy-9-octadecanoic acid; 20,21 thus the presence of hydroxyl groups makes the oil suitable for use in urethane type reactions. Also, the hydrogen bonding of its hydroxyl group confers a high viscosity on the oil.…”