Comparison Properties of Natural Rubber (SMR L)/Ethylene Vinyl Acetate (EVA) Copolymer Blends and Epoxidized Natural Rubber (ENR-50)/Ethylene Vinyl Acetate (EVA) Copolymer Blends

Journal of Reinforced Plastics and Composites

Ratnam

2012

The effects of organoclay loading and electron beam irradiation on the crosslinking and degradation of ethylene(vinyl acetate) copolymer (EVA)/natural rubber, grade Standard Malaysian Natural Rubber (SMR L) nanocomposites was studied. The nanocomposites were prepared through the melt blending technique with the ratio of EVA: SMR L fixed at 50:50 and organoclay loading varied from 0 to10 phr. The samples were irradiated using a 3.0 MeV EB machine with doses ranging from 50 to 200 kGy. At irradiation dose 50-150 kGy organoclay reduces the crosslinking yield significantly as evidenced from the gel fraction results and thus, storage modulus decreases and tan delta max values increases for the nanocomposites compared to neat EVA/SMR L. However, at 200 kGy the crosslinking yield was not much affected by the organoclay and thus, the storage modulus increased and tan delta max decreased. Scanning electron micrograph images show that different level of irradiation dose form different phase morphology on the nanocomposites. Analysis on Fourier transform infrared spectrums and carbonyl index values proved that the nanoscale dispersion and barrier effect of organoclay influence the crosslinking and degradation of the nanocomposites thus gives a significant effect on the dynamic mechanical properties.

Section: Etcmentioning

confidence: 75%

Effect of organoclay loading on the crosslinking and degradation of irradiated ethylene(vinyl acetate) copolymer/natural rubber nanocomposites

Munusamy

Journal of Reinforced Plastics and Composites

Ratnam

2012

“…Information regarding rheological behavior, mixing effectiveness, and processability of the composites can be obtained from the mixing torque profile [39–41]. Torque value can be obtained during melt mixing of PLA/TPCS biocomposites.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Different Compounding Sequence and Peanut Shell Powder Loading on Properties of Polylactic Acid/Thermoplastic Corn Starch Biocomposites

Zaaba

Vinyl Additive Technology

2019

Three different blending sequences were used to prepare the peanut shell powder (PSP)‐filled polylactic acid (PLA)/thermoplastic corn starch (TPCS) biocomposites. The blending sequences can be summarized as (1) S1: PLA was added, followed by TPCS and PSP, (2) S2: PLA was added, followed by PSP and TPCS, and (3) S3: TPCS was added, followed by PLA and PSP. Various loadings of PSP filler were used from 0 to 40 wt%. The correlation between different blending sequences and PSP filler loading of PLA/TPCS biocomposites were discussed in terms of processing torque, tensile properties, surface morphology, and thermal degradation. Results showed that S1 system is the best blending sequence to prepare PLA/TPCS biocomposites compared to S2 and S3 systems. S1 system had established the low stabilization torque, better tensile strength, elongation at break, and thermal stability. Scanning electron microscopy (SEM) analysis of S1 system revealed better adhesion between filler and the matrix. Incorporation of PSP had influenced the properties of PLA/TPCS biocomposites. Increment of PSP loading increased stabilization torque and tensile modulus while decreasing tensile strength, elongation at break, and thermal stability of PLA/TPCS biocomposites. SEM analysis also managed to detect holes and cavities as the filler pulled out on the tensile fractured surface due to poor adhesion between filler and matrix.

“…The mixing torque profile obtained during the melt mixing of the EVA/NR/MLF composites in a Haake internal mixer provides information about the rheological behavior, the processibility, and the mixing effectiveness of the composites . Figure shows the torque development of MLF‐filled EVA/NR composites at the 30 phr content for different blending sequences.…”

Section: Resultsmentioning

confidence: 99%

“…However, the diene structure makes NR susceptible to oxidization by atmospheric ozone and permeable to petroleum‐based oils and fuels. On the other hand, EVAs are a widely used thermoplastic because of their good mechanical properties, excellent ozone resistance, and good weather resistance . Blending EVA and NR resulted in improved melt elasticity for the EVA and improved thermal aging resistance for the NR .…”

Section: Introductionmentioning

confidence: 99%

Properties and characterization of ([Mengkuang leaf fiber]‐filled ethylene vinyl acetate)/(natural rubber) blend: Effects of blending sequences and mengkuang leaf fiber loading

Hashim

Vinyl Additive Technology

Rusli

2016

Ethylene vinyl acetate [EVA])/(natural rubber [NR])/ (Mengkuang leaf fiber) (MLF) thermoplastic elastomer composites were prepared by using three different blending sequences in an internal mixer. The blending sequences studied were (i) B1: NR was added followed by MLF into the molten EVA; (ii) B2: MLF was added followed by NR into the molten EVA; (iii) B3: MLF was added followed by EVA into the molten NR. The effect of different blending sequences and fiber loadings from 10 to 40 parts by weight per hundred parts of resin on the torque development, tensile properties, thermal degradation, and morphology of EVA/NR/MLF composites was studied. Of the blending sequences investigated, the B1 system is considered the best method for the preparation of EVA/NR/MLF composites. The B1 system produces composites with lower stabilization torque, higher tensile strength, and better thermal stability compared with other systems. At 40 parts by weight per hundred parts of resin of MLF loading, the tensile strength of the composite prepared by using the B1 system was 15% higher than that of B2 system composites, and 8% higher than that of the B3 system. Scanning electron micrographs of the tensile fracture surfaces indicated this system also had good fiber dispersion in the EVA/NR matrix. An increase in MLF loading resulted in an increase of the values of the stabilization torque and the Young's modulus, but a decrease in values of the tensile strength, the elongation at break, and the thermal stability of the composites. Scanning electron microscopy revealed increased fiber pullout in the composites as the loading increased.