Detection of compatibility of some rubber blends by DSC

Yehia, A. A.; Mansour, Ahmed S.; Stoll, B.

doi:10.1007/bf01983440

Cited by 33 publications

(19 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Slight shifting of glass transition temperature of both the NR and NBR toward higher temperature side relative to those of unfilled sample is observed in DSC measurement. The positive shift of T g may be associated with the decreased mobility of the rubber chains by addition of silica owing to increased rubber-filler interaction [48][49][50][51][52]. These results are in good agreements with the curing and mechanical properties of silica-filled composites.…”

Section: Differential Scanning Calorimetry (Dsc)supporting

confidence: 88%

Compatibilization of natural rubber/nitrile rubber blends by sol–gel nano-silica generated by in situ method

Bansod

Kapgate

Das

et al. 2016

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Controlled growth of in situ silica, into natural rubber (NR)/nitrile rubber (NBR) blend (40/60 composition by weight) following solution sol-gel method, results in a coherent blend morphology with enhanced composite properties. Similar composites, i.e., in situ silica-filled NR/ NBR blend (40/60 by weight), showed better mechanical properties than any other composition that were prepared by soaking sol-gel method in earlier study. However, silica content in the rubber blend was limited to 20 phr (parts per hundred parts of rubber) and could not be increased under experimental condition following soaking sol-gel method. In the present work, silica content is increased (up to 30 phr) beyond that limit for the same blend composition. Accordingly, mechanical properties of the NR/NBR composites are improved. Use of a silane coupling agent, viz., bis-(3-triethoxysilylpropyl)-tetra sulfide, in the reactive sol-gel system during in situ silica generation brings in remarkable effect in silica distribution, rubber-filler interaction and mechanical properties of the composites. TEM micrographs of the selected composites reveal that silica is mostly grown at the interfacial region, when silane is used in particular. This results in further enhancement in mechanical properties and compatibility of the blend at the same silica content as evident from stress-strain and dynamic mechanical analysis studies. The reinforcement of effect in situ silica is assessed by Guth-Gold equation and modified form of Guth equation (with shape factor f = 2.53). The results are supported by the detailed studies on rheological, morphological, mechanical and viscoelastic properties of the composites. Graphical AbstractKeywords Rubber blend Á Sol-gel method Á In situ silica Á Rubber-filler interaction Á Silane treatment Á Reinforcement

show abstract

Section: Differential Scanning Calorimetry (Dsc)supporting

confidence: 88%

Compatibilization of natural rubber/nitrile rubber blends by sol–gel nano-silica generated by in situ method

Bansod

Kapgate

Das

et al. 2016

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

show abstract

“…were calculated from the torque -time curves. The cure rate index (CRI) of the compounds cured with the same level of curative was calculated according to equation as given below [33].…”

Section: Cure Behaviormentioning

confidence: 99%

Influence of clay on the vulcanization kinetics of fluoroelastomer nanocomposites

Kader

Nah

2004

Polymer

View full text Add to dashboard Cite

“…However, the presence of two T g s does not necessarily indicate a complete incompatibility of the two components. As reported, two phases in immiscible blends can present compatibility at certain interphase . Often, compatibility of two components leads to a considerable change in the T g of each component in the blend.…”

Section: Resultsmentioning

confidence: 99%

“…As reported, two phases in immiscible blends can present compatibility at certain interphase. [49,50] Often, compatibility of two components leads to a considerable change in the T g of each component in the blend. However, this scenario is not observed in this blend system.…”

Section: Glass Transition Behavior Of the Blendsmentioning

confidence: 99%

Thermal Properties and Morphology of Compatible Poly(ethylene oxide)/Natural Rubber‐graft‐poly(methyl methacrylate) Blends

Zainal

Hein²,

Abetz

et al. 2018

Macromolecular Symposia

View full text Add to dashboard Cite

Free standing films of blends of poly(ethylene oxide) and natural rubber‐graft‐poly(methyl methacrylate) (PEO/NR‐g‐PMMA) with 40 mol% of PMMA‐graft were prepared at different mass compositions using solution casting technique. These blends show immiscibility in the molten state as indicated by two glass transition temperatures (Tg's), which correspond relatively close to the PEO and NR‐backbone components. The assessment of Tg of the PMMA‐graft can not be made under the experimental condition (heating up to 80 °C). It is expected that the Tg of PMMA‐graft is around 100 °C. Upon cooling from the melt, PEO crystallizes and liquid‐solid phase separation takes place. At room temperature, although the blends are immiscible, results show that the amorphous phase of the blends may comprise of mixture of compatible interfacial region of PEO and PMMA‐graft. Differential scanning calorimetry (DSC) analysis was used for the qualitative assessment of the blend compatibility. The compatibility of PEO and PMMA‐graft was evaluated by change in heat capacity (ΔCp) of the glass transition of PEO and NR‐backbone in the blends. Furthermore, the crystallinity (X*) and melting temperature (Tm) of PEO in the blends at higher content of NR‐g‐PMMA are depressed, which support the Tg and ΔCp results. These findings are in agreement with PEO crystalline structure from WAXS analysis and morphological studies where the PEO spherulites show a significant change upon addition of NR‐g‐PMMA in the blends.

show abstract

Detection of compatibility of some rubber blends by DSC

Cited by 33 publications

References 14 publications

Compatibilization of natural rubber/nitrile rubber blends by sol–gel nano-silica generated by in situ method

Compatibilization of natural rubber/nitrile rubber blends by sol–gel nano-silica generated by in situ method

Influence of clay on the vulcanization kinetics of fluoroelastomer nanocomposites

Thermal Properties and Morphology of Compatible Poly(ethylene oxide)/Natural Rubber‐graft‐poly(methyl methacrylate) Blends

Contact Info

Product

Resources

About