Modified Castor Oil Based Polyurethane Elastomers for One-Shot Process

Jaisankar, Sellamuthu N.; Lakshminarayana, Y.; Radhakrishnan, Ganga; Ramasami, T.

doi:10.1080/03602559608004060

Cited by 16 publications

(4 citation statements)

References 11 publications

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“…For instance, elongation at break of initial PVC film was 110%, while the elongation at break for the PVC film plasticized with 1.5 wt.%, 30 wt.% and 40 wt.% PEG was 310%, 330% and 290%, about 182%, 200% and 164% higher than the initial PVC film, respectively. Thus, PEG is usually used to improve the flexibility of some polymer matrix [19,20] . Interestingly, the addition of less than 1.5 wt.% PEG could not only greatly improve the elongation at break, but also increase the tensile strength of the PVC film.…”

Section: Resultsmentioning

confidence: 99%

Morphology, Microstructure and Properties of PEG-plasticized PVC

Chen

Sheng

Duan

et al. 2011

Polymer-Plastics Technology and Engineering

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Poly(vinyl chloride) (PVC) could be plasticized with poly(ethylene glycol) (PEG) introduced via solution mixing. Infrared and gel permeation chromatography (GPC) analysis indicated the combination of PEG with PVC. The plasticization effect of PEG was obvious for PVC film with less than 40 wt.% PEG. Thermogravimetric analysis (TGA) showed PEG reduced the thermal stability of PVC. Atomic force microscope (AFM) and optical microscope (OM) results indicated micropores formed on plasticized PVC films due to the enrichment of PEG from PVC matirx. The PEG also increased the hydrophilicity of PVC by reducing the water contact angles.

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Section: Resultsmentioning

confidence: 99%

Morphology, Microstructure and Properties of PEG-plasticized PVC

Chen

Sheng

Duan

et al. 2011

Polymer-Plastics Technology and Engineering

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“…Among them, castor oil (CO) based polyurethane (PU) is the most important one. Castor oil is an important vegetable oil containing hydroxyl groups, which are used to obtain oil based polyurethane. , The vegetable oil based polyurethanes have the following advantages: high strength, stiffness, environmental resistance, and long life properties . Castor oil replaced polyol from petrochemicals owing to its stability at different temperatures and pressures .…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Studies on Polyurethane/Siloxane Cross-Linked Films for Hydrophobic Surfaces by the Sol–Gel Process

et al. 2013

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A series of castor oil based polyurethane/siloxane cross-linked films were prepared using castor oil, isophorone diisocyanate, and 3-aminopropyl trimethoxysilane by the sol-gel process. Fourier transform infrared (FT-IR) spectra reveal the cross-linking interaction between polyurethane and siloxane moieties, thereby shifting the peak position of characteristic N-H and C═O groups to higher wavenumber. (29)Si (silica) solid state nuclear magnetic resonance spectra were used to prove the formation of siloxane network linkage in the polyurethane system, thereby analyzing the Si environment present in the polyurethane/siloxane cross-linked films. The activation energy values at two stages (Tmax1 and Tmax2) for the degradation of polyurethane films were increased with increasing silane ratio. The calculated activation energy values for the higher silane ratio (1.5) are 136 and 170 kJ/mol at Tmax1 and Tmax2, respectively. From contact angle measurements, we observed that increasing siloxane cross-linking increased the hydrophobicity of the films. The optical transmittance obtained from ultraviolet-visible spectra indicated that the film samples are transparent in the region 300-800 nm. The moisture sorption/desorption isotherm curve shows a characteristic behavior of type III isotherm corresponds to hydrophobic materials. Dynamic mechanical studies show that the increase in storage modulus reveals siloxane cross-linking gives rigidity to the films. Atomic force microscopic images show that the introduction of siloxane changes the surface roughness of the polyurethane films. It is found that the siloxane cross-linking can be used to obtain hydrophobic surface films having good thermal stability and optical transmittance.

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“…[4][5][6] In our earlier work, we reported the morphological and mechanical properties of ternary semi-IPNs based on nitrocellulose, 7 poly(vinyl chloride-covinyl acetate), 8 and polyurethane derived from castor oil. 9 Most of the polymer pairs are generally immiscible or partially miscible. For improving the miscibility and thus the degree of interpenetration of the components, one often tries to introduce attractive groups between the components.…”

mentioning

confidence: 99%

Semi‐interpenetrating polymer networks based on polyurethane ionomer/poly(vinyl chloride)

2004

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Semi-interpenetrating polymer networks (IPNs) have been prepared from polyurethane anionomers and poly(vinyl chloride) using sequential polymerization technique. These IPNs were compression molded and obtained as tough films. The hydrogen bonding interaction, glass transition temperature, and thermal stabilities were discussed based on Fourier-transform infrared spectrophotometer, differential scanning calorimetry, and thermogravimetric analysis. Morphology of the IPNs was characterized by scanning electron microscope and it reveals the formation of compatible IPNs. Tensile strength and hardness increase with increasing NCO/OH ratio and ionic

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Modified Castor Oil Based Polyurethane Elastomers for One-Shot Process

Cited by 16 publications

References 11 publications

Morphology, Microstructure and Properties of PEG-plasticized PVC

Morphology, Microstructure and Properties of PEG-plasticized PVC

Physicochemical Studies on Polyurethane/Siloxane Cross-Linked Films for Hydrophobic Surfaces by the Sol–Gel Process

Semi‐interpenetrating polymer networks based on polyurethane ionomer/poly(vinyl chloride)

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