Rheological Behavior and Nonisothermal Crystallization of Polypropylene/Epoxidized Natural Rubber Blends

Huang, Hailang; Yang, Ling; Ni, Xiuyuan

doi:10.1081/mb-200045967

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…These include ENR, styrene or methyl methacrylategrafted natural rubber, and maleic anhydride-grafted natural rubber (maleated NR). 13,[19][20][21][22][23] The TPE based on ENR/PP has been the subject of studies by many researchers who have investigated different aspects such as its morphology, rheology, thermal, and mechanical properties, while others focused particularly on the compatibilization of the blend constituents. [24][25][26][27][28] One chemically modified form of PP, which is maleic anhydride-grafted polypropylene (PP-g-MA) has also been used.…”

Section: Introductionmentioning

confidence: 99%

Compatibilization of natural rubber–polypropylene thermoplastic elastomer blend

Belhaoues

Benmesli

Riahi

2019

Journal of Elastomers & Plastics

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The effects of the addition of epoxidized natural rubber/maleic anhydride-grafted polypropylene blend as a compatibilizing agent (CA) on the properties of natural rubber (NR)/polypropylene (PP) thermoplastic elastomer blend were studied. The blends were prepared in the molten state at 180°C using a Brabender Plasticorder at a rotor speed of 60 r min−1. Evidence of compatibilization was obtained from the Brabender plastograms and from the mechanical properties results as well as the morphological analysis. It was found that the addition of the CA at different contents resulted in an increase of the tensile strength and Young’s modulus and a decrease of the elongation at break. It was also found that the melting temperature remained unchanged, the % crystallinity decreased, but the thermal stability was not affected. The morphology revealed a more homogeneous distribution of the dispersed PP phase for the CA-containing systems compared to the control NR/PP blend. These effects were attributed to the interactions that developed with the blend constituents through the functional groups of the CA.

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Section: Introductionmentioning

confidence: 99%

Compatibilization of natural rubber–polypropylene thermoplastic elastomer blend

Belhaoues

Benmesli

Riahi

2019

Journal of Elastomers & Plastics

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Effect of grafted maleic anhydride content and recyclability of dynamically cured maleated natural rubber/polypropylene blends

Nakason

Saiwari

2008

J of Applied Polymer Sci

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Maleated natural rubbers (MNRs) were prepared using various levels of maleic anhydride (MA) at 4, 6, 8, 10, and 12 phr. Dynamically cured 60/40 MNR/PP blends with phenolic-modified polypropylene (Ph-PP) compatibilizer at a loading level of 5 wt % of PP were prepared by melt mixing process using sulfur vulcanization system. The influence of the level of MA on properties of the thermoplastic vulcanizates (TPVs) was studied. It was found that the mixing torque, apparent shear stress, shear viscosity, tensile strength, and hardness properties increased with increasing levels of the MA or grafted succinic anhydride groups in the MNR molecules. This is attributed to an increase in chemical interaction and reaction between methylol groups in the Ph-PP molecules and polar functional groups in the MNR molecules upon increasing levels of the grafted succinic anhydride groups. As a consequence, compatibilizing block copolymers of MNR and PP blocks were formed. The block copolymers were capable of compatibilizing with MNR and PP blend components via the respective blocks. Recyclability of the MNR/PP TPVs was also studied. It was found that, after processing through a number of cycles by injection molding and extrusion processing, the TPV exhibited marginal decreases in mechanical properties. This corresponded to slightly increasing size of the dispersed vulcanized rubber domains.

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Dynamically vulcanized blends of polypropylene and ethylene octene copolymer: Influence of various coagents on mechanical and morphological characteristics

Babu

Singha

Naskar

2009

J of Applied Polymer Sci

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Dynamically cured blends of polypropylene (PP) and ethylene octene copolymer (EOC) with coagentassisted peroxide curative system were prepared by meltmixing method. It was well established that PP exhibits b-chain scission in the presence of peroxide. Principally, incorporation of a coagent increases the crosslinking efficiency in the EOC phase and decreases the extent of degradation in the PP phase. The present study mainly focused on the influence of three structurally different coagents, namely, triallyl cyanurate (TAC), trimethylol propane triacrylate (TMPTA), and N,N 0 -m-phenylene dimaleimide (MPDM), on the mechanical properties of the PP/EOC thermoplastic vulcanizates (TPVs). The reactivity and efficiency of different coagents were characterized by cure study on EOC gum vulcanizate. TAC showed the highest torque values followed by MPDM and TMPTA. Significant improvements in the physical properties of the TPVs were inferred with the addition of coagents. Among the three coagents used, MPDM showed the best balance of mechanical properties in these TPVs. The results indicated that torque values obtained during mixing and the final mechanical properties can be correlated. Different aspects were explained for the selection of a coagent that forms a product with desired properties. The phase morphologies of the TPVs prepared were studied by scanning electron microscopy. Tensile fracture patterns were also analyzed to study the failure mechanism of the samples.

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Rheological Behavior and Nonisothermal Crystallization of Polypropylene/Epoxidized Natural Rubber Blends

Cited by 6 publications

References 15 publications

Compatibilization of natural rubber–polypropylene thermoplastic elastomer blend

Compatibilization of natural rubber–polypropylene thermoplastic elastomer blend

Effect of grafted maleic anhydride content and recyclability of dynamically cured maleated natural rubber/polypropylene blends

Dynamically vulcanized blends of polypropylene and ethylene octene copolymer: Influence of various coagents on mechanical and morphological characteristics

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