Room-temperature kinetics of formation of castor-oil-based polyurethane/poly(methyl methacrylate) interpenetrating polymer networks

Suthar, Bhikhu; Jadav, Kanak; Dave, Mayank

doi:10.1088/0954-0083/5/2/007

Cited by 1 publication

(1 citation statement)

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“…13 After the full conversion of the functional groups, elastically inactive parts (dangling chain, coming from the triglyceride oil) act as plasticizers that reduce polymer rigidity and improve polymer flexibility. [14][15][16][17][18][19][20] In linear polyurethane, which is a physically cross-linked elastomer, the variation of the hard and soft segments endows the elastomer with its mechanical and dielectric properties. Upon this variation, the dielectric constant may reach high values as a function of the electric field and temperature.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of castor oil cross-linked polyurethane

Oprea¹,

Potolinca²,

Oprea

2010

High Performance Polymers

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A series of polyurethanes cross-linked with castor oil were synthesized and the influence of the polyurethane chemical structure on molecular relaxations in such systems was determined. Three different castor oil rates were used in the synthesis of the cross-linked polyurethane chains. These cross-linked polyurethanes were compared with a linear polyurethane which was obtained by chain extension with 1,4-butane diol. The dielectric properties and relaxation phenomena of the polyurethane were studied as a function of the hard segment structure and cross-linker content as structural variables and frequency and temperature as experimental variables. It was found that the formation of hydrogen bonds between urethane groups of physical networks may control the molecular mobility, but the chemical nature and content of the cross-links of the hard segments strongly influences the molecular relaxation. The relaxation peaks were observed in the temperature range of -65 to 60°C for polyurethane with different cross-linked segment contents, peaks which shifted to high temperature with the increase in frequency.

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