Dynamic mechanical and thermal properties of a chemically modified polypropylene/natural rubber thermoplastic elastomer blend

Benmesli, Samia; Riahi, Farid

doi:10.1016/j.polymertesting.2014.03.016

Cited by 52 publications

(31 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These changes are due to effective formation of crosslinking in APS compatibilized blends (Benmesli and Riahi, 2014). Interestingly, LR compatibilized blend, upon irradiation, showed shifting of loss modulus peak temperature and height to -18.2 °C (increased by 1.4 °C ) and 374.5 MPa (increased by 140.5 MPa), respectively, compared to non-irradiated counterpart.…”

Section: Loss Modulusmentioning

confidence: 94%

Improving the properties of reclaimed waste tire rubber by blending with poly(ethylene‐co‐vinyl acetate) and electron beam irradiation

Ramarad

Ratnam

Khalid

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

Non-degradable waste tire generation around the world is growing at an alarming rate. Diversifying the recycling route of these waste tires is essential to solve the problem. One way is to incorporate them into polymers and convert them into new products. However, incorporation of ground tire rubber into thermoplastics has been hampered due to lack of toughness and adhesion between phases. To address the issue, this study utilized reclaimed waste tire rubber (RTR) instead; and evaluated the properties of RTR and poly(ethyleneco-vinyl acetate) (EVA) blends. The properties of the RTR/EVA blends were further enhanced by compatibilization and electron beam irradiation.Processing, mechanical, thermal and dynamic mechanical properties of RTR were tremendously improved by blending with EVA. However, the interfacial adhesion was found to lack in the blends. Compatibilization by reactive, physical and combination strategies were explored utilizing (3-Aminopropyl)triethoxy silane (APS), liquid styrene butadiene rubber (LR) and maleated EVA (MAEVA), respectively. APS and MAEVA were found to be the most and least favourable compatibilizer, respectively. Apart from functioning as reactive compatibilizer, APS also reclaimed the RTR phase further. These lead to improved dispersion of smaller RTR phase in EVA matrix and enhanced the interfacial adhesion.Electron beam irradiation revealed the presence of radical stabilizing and scavenging additives within RTR which retards the crosslinking process in RTR and RTR/EVA blends. Though chain scissions were predominant; study showed the replacement of S-S and S-C bonds with stronger and stiffer C-C bonds ensures the retention of RTR and RTR/EVA blends properties upon irradiation.Compatibilization of RTR/EVA blend by APS (50RTR/5APS) also improved the crosslinking efficiency. However, the blend still suffered from oxidative degradation from irradiation in air. Radiation sensitizers, trimethylol propane triacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA) and N,N-1,3Phenylene Bismaleimide (HVA2), were used to accelerate the irradiation induced crosslinking in RTR and 50RTR/5APS blends. Presence of radiation sensitizers leads to simultaneous improvement in toughness and tensile strength of RTR and 50RTR/5APS blends. Elastic capacity of RTR phase was restored and interfacial adhesion enhanced in the presence of radiation sensitizers.iii

show abstract

Section: Loss Modulusmentioning

confidence: 94%

Improving the properties of reclaimed waste tire rubber by blending with poly(ethylene‐co‐vinyl acetate) and electron beam irradiation

Ramarad

Ratnam

Khalid

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The enthalpy change (∆H) can be determined for a phase transition by integrating over the area in which this transition takes place on the DSC curve [17]. From Table 1, it can be seen that the magnitude of the integrated melting temperature peak gives melting enthalpy, ∆H m for EVA to be 33.02 (J/g) which decreased to be 13.78 (J/g) for the highest CB/PPy content 30 (pph) embedded in EVA.…”

Section: Xrd Measurementmentioning

confidence: 99%

“…From Table 1, it can be seen that the magnitude of the integrated melting temperature peak gives melting enthalpy, ∆H m for EVA to be 33.02 (J/g) which decreased to be 13.78 (J/g) for the highest CB/PPy content 30 (pph) embedded in EVA. The crystallinity ( )on melting was calculated for all samples using the following relation [17]…”

Section: Xrd Measurementmentioning

confidence: 99%

Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

Ahmed

El-Bary

2018

Arab Journal of Nuclear Sciences and Applications

View full text Add to dashboard Cite

“…The chemical modification not only improves the interaction between the blend components but also compensates some of NR drawbacks such as its resistance to ageing and to solvents or its gas impermeability. 4 Many types of chemical modification have been used, such as chlorination, 5 epoxidation, 6 hydrogenation, 7 and grafting. 8,9 Among these, grafting is one of the most attractive techniques.…”

Section: Introductionmentioning

confidence: 99%

Modification of Vietnam Natural Rubber via Graft Copolymerization with Styrene

Dung¹,

Nhàn²,

Thương³

et al. 2016

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Graft copolymerization of styrene onto deproteinized natural rubber (DPNR) using tert-butyl hydroperoxide (TBHPO) and tetraethylene pentamine (TEPA) as redox initiator have been investigated. The effects of initiator and monomer concentration on conversion and grafting efficiency were studied. The dynamic mechanical and thermal properties of the graft copolymer were investigated over the wide range of temperatures. It is shown that a high value of storage modulus for the graft copolymer, which was about 25 times as high as that of DPNR, was achieved. The graft copolymer (DPNR-graft-PS) showed the outstanding tensile strength and stable thermal properties. These enhancements were attributed to the interaction between NR and polystyrene as a result of the graft copolymerization. Morphology observation by transmission electron micrograph (TEM) revealed that the core-shell arrangement of the DPNR-graft-PS with about 30 nm in thickness of polystyrene nano-layer was achieved.

show abstract

Dynamic mechanical and thermal properties of a chemically modified polypropylene/natural rubber thermoplastic elastomer blend

Cited by 52 publications

References 16 publications

Improving the properties of reclaimed waste tire rubber by blending with poly(ethylene‐co‐vinyl acetate) and electron beam irradiation

Improving the properties of reclaimed waste tire rubber by blending with poly(ethylene‐co‐vinyl acetate) and electron beam irradiation

Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

Modification of Vietnam Natural Rubber via Graft Copolymerization with Styrene

Contact Info

Product

Resources

About