Instrumented impact testing of castor‐oil‐based polyurethanes

Liu, T. M.; Bui, V. T.

doi:10.1002/app.1995.070560305

Cited by 20 publications

(12 citation statements)

References 6 publications

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“…19 Data on the total impact energy of graft IPNs are reported together with those of tensile toughness in Figure 8. In contrast to the tensile toughness, the total impact energies are below the values calculated from the additive law, except those corresponding to a narrow composition window of 25-30% PU, where the total im- pact energy is a little higher than the calculated value.…”

Section: Toughness and Impact Energymentioning

confidence: 99%

“…[12][13][14][15][16][17][18] In our previous work, 19,20 PUs prepared from castor oil showed high impact properties and a large synergistic effect in the mechanical properties of IPNs obtained from methyl methacrylate and castor oil. In this work, IPNs were prepared from epoxy resin and castor oil following a sequential method of synthesis, and their morphology and thermal and mechanical properties were determined.…”

Section: Introductionmentioning

confidence: 99%

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Epoxy/castor oil graft interpenetrating polymer networks

Raymond

Bui

1998

J. Appl. Polym. Sci.

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Full-interpenetrating polymer networks (IPNs) were prepared from epoxy and castor oil-based polyurethane (PU), by the sequential mode of synthesis and were characterized by different techniques: swelling test, scanning electron microscopy (SEM), thermomechanical analysis (TMA), thermogravimetric analysis (TGA), tensile test, and instrumented impact test. 2,4-Toluene diisocyanate (TDI) was used as a curing agent for castor oil, at a NO/OH ratio ϭ 1.50. Diglycidyl ether of bisphenol A (DGEBA) was cured and crosslinked using 2,4,6-tris(dimethylaminomethyl)phenol (TDMP) at 1.5%, by weight, of epoxy resin. The homogeneous morphology of IPN samples of PU compositions up to 40%, by weight, revealed by SEM may be attributed to some extent to grafting of the PU phase onto the epoxy matrix, which results from the reaction between NCO groups in the PU phase with OH groups in the epoxy matrix. This has some synergistic effect on the thermal resistance and tensile properties of IPNs compared to those of the pure components, such as illustrated by the data from TGA and tensile tests. However, the grafting structure appears not to enhance their impact resistance, which probably requires the formation of rubbery particles of suitable size.

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Section: Toughness and Impact Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Epoxy/castor oil graft interpenetrating polymer networks

Raymond

Bui

1998

J. Appl. Polym. Sci.

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“…However, vegetable oils have become attractive for the synthesis of PUDs because of their economical benefits and the fact that they are made from renewable resources [18][19][20][21][22][23]. CO is one of the vegetable oils that used as polyol in the synthesis of PU due to its cheapness and availability as renewable material [24][25][26]. It is a triglyceride of fatty acids with ricinoleic acid being the major constituent (about 90 %).…”

Section: Introductionmentioning

confidence: 99%

Polyurethane/aromatic polyamide sulfone copolymer dispersions from transesterified castor oil

et al. 2016

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Four polyurethane/polyamide copolymer dispersions (PUCON-co-APAS) were prepared from castor oil-based polyol (CON). Castor oil (CO) was firstly transesterified with triethanolamine at 210°C for different time intervals: 30, 60, 90 and 120 min, to produce CON30, CON60, CON90 and CON120 polyols, respectively. The hydroxyl and acid values, density, viscosity, chemical structure analysis of the CON polyols were determined. The polyols were used to prepare PUCON30-co-APAS, PUCON60-co-APAS, PUCON90-co-APAS, and PUCON120-co-APAS copolymer dispersions in five steps using prepolymer self-emulsification solvent process. The first step is the prepolymer preparation step, in which CON was reacted with dimethylolpropionic acid and excess toluene diisocyanate to produce PUCON NCO . The second step is the copolymerization step, in which PUCON NCO was reacted with amino-terminated aromatic polyamide sulfone. The following processes are neutralization, chain extension and dispersion steps. The prepared copolymer dispersions were characterized using FTIR, DLS, TGA, DSC and GPC. Additionally, the physical, chemical and mechanical properties of the prepared copolymers were studied. The results showed an increase in the hydroxyl number of CON with increasing transesterification time. Stronger H-bonds and smaller particle sizes are produced using CON with higher transesterification time in the preparation of the copolymer dispersions.

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“…Already, several polymers have demonstrated their qualities that would be well suited for such an application [7][8][9][10][11][12]. However, if the concerns about corrosion could be brushed aside for copper, this metal has many outstanding properties which justify that its consideration be maintained as a candidate material for the fabrication of the container walls.…”

Section: Introductionmentioning

confidence: 99%

“…A literature research has revealed many valuable works performed on the physico-mechanical properties of castor oil-based polyurethanes; and the effects of chain extenders, isocyanate structure, and hard-to-soft ratio [13][14][15][16]. However, no research has been performed on the study of the radiation effects on natural castor oil-based polyurethanes.…”

Section: Introductionmentioning

confidence: 99%