scholarly journals The Epoxidized Vietnam Rubber Seed Oil as a Secondary Plasticizer/Thermal Stabilizer in PVC Processing

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Nguyen Thi Thuy ◽  
Vu Minh Duc ◽  
Nguyen Thanh Liem
Keyword(s):  
Thermal Stability ◽  
Seed Oil ◽  
Sample Weight ◽  
Rubber Seed Oil ◽  
Rubber Seed ◽  
Plasticized Pvc ◽  
Secondary Plasticizer ◽  
Positive Effect ◽  
Thermal Stability Of

The epoxidized rubber seed oil (EeRSO) was a mixture of epoxidized triglyceride, and epoxidized methyl ester of free fatty acids was used as a secondary plasticizer for PVC. An increase in tensile properties was observed by substituting the 10 phr DOP plasticizer with the EeRSO in PVC formulation. A leaching test was performed in five media to evaluate the plasticizing effect. The sample weight increased slightly after soaking in water and 30 wt.% acetic solution, decreased slightly in 10 wt.% KOH solution, and reduced sharply and strongly in sunflower oil and n-hexane. The 10 phr EeRSO in PVC formulation has presented an improvement in migration, volatilization characteristics, and thermal property of PVC. After 72 hours of soaking in n-hexane, the shore A hardness of the EeRSO plasticized PVC sample increased by 14.5% while the PVC sample without EeRSO was blistered and its shore A hardness could not be measured. This was the clearest evidence for the positive effect of EeRSO as a secondary plasticizer. The morphology of the fractured surface of the samples after immersing in n-hexane was studied by using scanning electron microscopy. Thermogravimetric analysis showed the role of EeRSO in significant improvement in thermal stability. In general, EeRSO not only acts as a primary plasticizer to improve the migration, extraction, and volatilization characteristics but also contributes to the thermal stability of PVC.

Rubber Seed Oil-Based Polyurethane Composites, Fabrication and Properties Evaluation

2007 ◽  
Vol 18-19 ◽  
pp. 233-239 ◽  
Author(s):  
F.E. Okieimen ◽  
I.O. Bakare
Keyword(s):  
Thermal Stability ◽  
Seed Oil ◽  
Scanning Electron Micrographs ◽  
Compression Moulding ◽  
Rubber Seed Oil ◽  
Rubber Seed ◽  
Pull Out ◽  
Polyurethane Composites ◽  
Thermal Stability Of ◽  
Fractured Surface

Polyurethane samples were prepared from rubber seed oil monoglyceride (made by reacting rubber oil with glycerol) and diiosocyanates (hexanethylene and toluene diiosocyanates). Polyurethane composites were made by compression moulding using biofibres; sisal, jute and banana; in random and unidirectional orientations at different fibre lengths and loadings, as reinforcing elements. The composites were characterized in terms of tensile and flexural strengths and moduli, thermal stability and morphology of fractured surface. The values of the measured mechanical properties (tensile and flexural) of the composites were about 3-fold higher than the properties of the unreinforced polyurethane samples, suggesting good reinforcement by the biofibres. The absence of fibre-pull-out on the scanning electron micrographs of the fractured surface provides evidence in support of good adhesion between the biofibres and the polyurethane matrix. The thermal stability of the composites was lower than for the fibre but higher than for the unreinforced polyurethane.

Studies in the Utilization of Biobased Additives as Thermal Stabilizer for Plasticized PVC

2009 ◽  
Vol 62-64 ◽  
pp. 335-344
Author(s):  
F.E. Okieimen ◽  
T.O. Egbuchunam ◽  
D.B. Balköse
Keyword(s):  
Thermal Degradation ◽  
Seed Oil ◽  
Initial Rate ◽  
Divalent Metal ◽  
Rubber Seed Oil ◽  
Yellowness Index ◽  
Rubber Seed ◽  
Thermal Stabilizer ◽  
Plasticized Pvc ◽  
Metal Soaps

Divalent metal (barium, cadmium, calcium and zinc) soaps of rubber seed oil and their binary mixtures (Ba/Cd and Ca/Zn) and epoxidized rubber seed oil (4.5% epoxide content) and its admixtures with the single divalent metal soaps were evaluated as thermal stabilizer for dioctylphthalate plasticized PVC using changes in discolouration indices (yellowness index and UV absorption at 360nm) and initial rates of dehydrochlorination measured at 140 and 160oC. The results obtained showed that the divalent metal soaps were relatively effective in stabilizing the dioctylphthalate plasticized PVC against thermal degradation and that the binary soap mixtures enhanced the heat stabilizing effectiveness: marked reduction in the values of the discolouration indices; longer dehydrochlorination induction period and smaller values of rate constant of initial rate of dehydrochlorination. It was found that epoxidized rubber seed oil was less effective in comparison with the divalent metal soaps in stabilizing plasticized PVC against thermal degradation. These results show that the bio-based additives are compatible with dioctylphthalate plasticized PVC, stable to heat within the range of temperature used in the processing of plasticized PVC, inhibit/retard dehydrochlorination and reduce the extent of degradation.

OPTIMISATION OF ENERGY AND MATERIALS IN ACID ESTERFICATION OF RUBBER SEED OIL THROUGH RSM AND ANN

2018 ◽  
Author(s):  
Jilse Sebastian ◽  
Vishnu Vardhan Reddy Mugi ◽  
C. Muraleedharan ◽  
Santhiagu A
Keyword(s):  
Seed Oil ◽  
Rubber Seed Oil ◽  
Rubber Seed

scholarly journals The role of the substrate on the mechanical and thermal stability of Pd thin films during hydrogen (de)sorption

2021 ◽  
Vol 46 (5) ◽  
pp. 4137-4153
Author(s):  
Neha Verma ◽  
Rob Delhez ◽  
Niek M. van der Pers ◽  
Frans D. Tichelaar ◽  
Amarante J. Böttger
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Thermal Stability Of

Mossbauer Study of the Role of Aluminum and Chromium in Nitrogen Implanted Iron

1991 ◽  
Vol 235 ◽  
Author(s):  
M. Kopcewicz ◽  
J. Jagielski ◽  
A. Turos ◽  
D. L. Williamson
Keyword(s):  
Thermal Stability ◽  
Ion Implantation ◽  
Metallic Iron ◽  
Conversion Electron ◽  
Alloying Elements ◽  
Mössbauer Study ◽  
Conversion Electron Mössbauer Spectroscopy ◽  
Conversion Electron Mossbauer Spectroscopy ◽  
Thermal Stability Of

ABSTRACTThe role of alloying elements such as Cr and Al in the formation and stability of the nitride phases formed due to N ion implantation into metallic iron was studied by conversion electron Mössbauer spectroscopy (CEMS). The thermal stability of nitride phases upon 1 h annealing was greatly increased as a result of co-implanting either Cr or Al with N as compared to pure α-Fe implanted only with N.

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