Studies on Hydroxyl Terminated Polybutadiene Toughened Phenolic Resin

Nirmal, C.; Maithi, S. N.; Padmavathi, T; Vanaja, A.; Rao, Raghavendra

doi:10.1177/0954008306055011

Cited by 13 publications

(12 citation statements)

References 12 publications

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“…The peak at 2.71 ppm was attributed to the appearance of the methine resonance due to the proton attached to the oxirane ring (CH 5 ). These results were in agreement with those of recent work by Yokshan and Hamzah et al The similarity of these spectra with those of NR confirmed that the cis −1,4‐polyisoprene structure was retained in the liquid NR …”

Section: Resultssupporting

confidence: 93%

Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

Mathew¹,

George²,

Parameswaranpillai

et al. 2013

J of Applied Polymer Sci

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Epoxidized natural rubbers (ENRs) were prepared. ENRs with different concentrations of up to 20 wt % were used as modifiers for epoxy resin. The epoxy monomer was cured with nadic methyl anhydride as a hardener in the presence of N,Ndimethyl benzyl amine as an accelerator. The addition of ENR to an anhydride hardener/epoxy monomer mixture gave rise to the formation of a phase-separated structure consisting of rubber domains dispersed in the epoxy-rich phase. The particle size increased with increasing ENR content. The phase separation was investigated by scanning electron microscopy and dynamic mechanical analysis. The viscoelastic behavior of the liquid-rubber-modified epoxy resin was also evaluated with dynamic mechanical analysis. The storage moduli, loss moduli, and tan d values were determined for the blends of the epoxy resin with ENR. The effect of the addition of rubber on the glass-transition temperature of the epoxy matrix was followed. The thermal stability of the ENR-modified epoxy resin was studied with thermogravimetric analysis. Parameters such as the onset of degradation, maximum degradation temperature, and final degradation were not affected by the addition of ENR. The mechanical properties of the liquid-natural-rubber-modified epoxy resin were measured in terms of the fracture toughness and impact strength. The maximum impact strength and fracture toughness were observed with 10 wt % ENR modified epoxy blends. Various toughening mechanisms responsible for the enhancement in toughness of the diglycidyl ether of the bisphenol A/ENR blends were investigated. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39906.

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Section: Resultssupporting

confidence: 93%

Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

Mathew¹,

George²,

Parameswaranpillai

et al. 2013

J of Applied Polymer Sci

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“…12,13 The hydroxyl-terminated polybutadiene (HTPB) is the most popular polyol applied in recent years. 14 This liquid prepolymer has outstanding physical characteristics including the low temperature of glass transition, high tensile ability, and strong chemical resistance. 14,15 HTPB-based propellants have distinct advantages such as very high reliability, good processing, and unequaled mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of different crosslinking mixtures on the mechanical properties of composite solid rocket propellants based on HTPB

Boshra

Guo

Elbeih

2020

High Performance Polymers

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The crosslinking agent is a vital key which affects the mechanical properties of composite solid rocket propellants (CSRPs). Under this scheme, the effect of crosslinking mixtures (CMs) based on trimethylolpropane (TMP) as a triol crosslinker and butanediol (BD) as a chain extender on CSRPs based on hydroxyl-terminated polybutadiene was investigated. A series of 27 propellant compositions was formulated to study the mechanical properties of the prepared CSRPs. The effect of changing the weight ratio of TMP to BD in the CM was studied. In addition, the influence of increasing the percentage of CM (from 0% to 0.5%) in the prepared samples was investigated. Also, the effect of the CM on CSRPs containing different curing ratio of NCO/OH = 0.7, 0.75, and 0.8 was studied to generate the largest possible strain-ability with high strength over different levels of curing conditions. The mechanical characteristics (tensile strength and strain) of the prepared CSRPs have been measured and plotted versus CM content, NCO/OH and TMP:BD ratio. Generally, the addition of CM leads to a remarkable enhancement in the propellant mechanical properties. Samples containing TMP:BD (2:1) provide the highest strength while samples containing TMP:BD (1:2) show the highest strain over all the NCO/OH ratios. Formulations with TMP:BD (1:1) give high strength with moderate strain. Variation in CM content has a remarkable influence on the mechanical properties of CSRPs. A wide range of tensile strength and strain were obtained from this study to offer variety of results suitable for different applications in the CSRPs technology.

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“…1,2 There are numerous ways to modify novolac resin. [3][4][5][6] One common way is to develop addition-cure phenolics, [7][8][9][10][11][12][13][14][15] including the introduction of allyl groups, maleimide groups, phenylethynyl groups, epoxy groups, benzoxazoline structure, benzoxazine structure, phenoltriazine structure, arylacetylene groups, phthalonitrile groups, ethynyl phenyl azo groups, and propargyl ether groups (propargylated novolac (PN) resins). Bindu et al 16 and Wang et al 17 have particularly investigated PN resins, and cured PN resins show improved thermal properties compared with the original novolac resin.…”

Section: Introductionmentioning

confidence: 99%

A new high performance novolac-based polytriazole resin

Wan

Huang

2016

High Performance Polymers

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A novolac-based polytriazole (NPTA) resin was synthesized using 4,4′-diazidomethylbiphenyl and a propargylated novolac resin through catalyst-free click polymerization. Differential scanning calorimetry and Fourier transform infrared analysis results demonstrate that the NPTA resin can be cured at 80°C. The glass transition temperature of the cured NPTA-88 resin is 202°C. The thermal degradation temperature of the cured NPTA resin is 352°C under nitrogen. The composite of the resin exhibits good mechanical property.

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Studies on Hydroxyl Terminated Polybutadiene Toughened Phenolic Resin

Cited by 13 publications

References 12 publications

Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

Influence of different crosslinking mixtures on the mechanical properties of composite solid rocket propellants based on HTPB

A new high performance novolac-based polytriazole resin

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