Interpenetrating polymer networks of cellulose nitrate and castor oil based polyurethanes—development and characterization

Abstract

SynopsisSemi-interpenetrating polymer networks of cellulose nitrate and castor oil based polyurethanes have been prepared by using excess diisocyanate for the crosslinking process. Semi-IPNs with 30% cellulose nitrate showed some degree of miscibility. Enhanced miscibility was observed by the partial replacement of cellulose nitrate with poly (vinyl chloride-co-vinyl acetate). The ternary IPNs of poly (vinyl chloride-co-vinyl acetate), cellulose nitrate, and polyurethanes showed increased tensile strength and decreased flammability than those based on cellulose nitrate and polyurethanes alone.

Novel polyurethane insulating coatings based on polyhydroxyl compounds, derived from glycolysed PET and castor oil

“…(9) with aforementioned kinetic parameters, whereas the solid lines are obtained directly from the DSC curve data by using eqs. (7) and (8). According to the results, it can be concluded that experimental data agree very well with the theoretical prediction.…”

Effects of molecular weight of nitrocellulose on structure and properties of polyurethane/nitrocellulose IPNs

“…3,5 It is regarded that the nitrocellulose macromolecules penetrate into PU networks, and give rise to semi-IPNs in the PU/NC samples. The X-ray diffractogram of the samples PU and PU/NC showed a broad halo commencing from 13°to 32°in 2 with lower magnitude, and there is no crystalline region.…”

“…In order to improve the shortcomings, a semi-interpenetrating polymer networks (IPNs) of nitrocellulose and castor-oil based polyurethane (PU) has been reported. 3 Recently, the water-resistant films from PU/poly(methylacrylate-co-styrene), 4 PU/nitrocellulose, 5 PU/chitosan, 6 and PU/elaeostearin 7 coatings to regenerated cellulose films were satisfactorily investigated in our laboratory. It was verified that the PU prepolymers in the coatings play an important role in forming IPNs, semi-IPNs, or grafted IPNs, and give rise to a share network crosslinked with cellulose and coating, which results in the strong interfacial bonding.…”

Interpenetrating polymer network of blocked polyurethane and phenolic resin. I. Synthesis, morphology, and mechanical properties

“…These materials are characterized by the presence of two networks strongly entangled ideally only by topological constraints [3, 4]. Interpenetrating polymerization is a mode of blending two polymers to produce a mixture in which phase separation is not as extensive as it would be otherwise [5, 6]. IPNs synthesized so far exhibit various degrees of phase separation depending mainly on the miscibility of polymers [7–9].…”