Water-dispersible isocyanate modified using plant-based castor oil: Synthesis and application as crosslinking agent

2021 ◽  
Vol 171 ◽  
pp. 113845
Author(s):  
Qin Chen ◽  
Zhenhua Gao ◽  
Long Bai ◽  
Zhen Xu ◽  
Jiyou Gu
Keyword(s):  
Castor Oil ◽  
Crosslinking Agent ◽  
Water Dispersible ◽  
Oil Synthesis

THE INFLUENCE OF ZNO NANOPARTICLES ON THE PROPERTIES OF HYPERBRANCHED ALKYD RESINS BASED ON CASTOR OIL

2021 ◽  
Author(s):  
Sonja Stojanov ◽  
◽  
Ilija Bobinac ◽  
Mirjana Jovičić ◽  
Olga Govedarica ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Castor Oil ◽  
Room Temperature ◽  
Mechanical Characteristics ◽  
Chemical Resistance ◽  
Crosslinking Agent ◽  
Environment Friendly ◽  
Alkyd Resins ◽  
Three Samples ◽  
Lower Viscosity

Hyperbranched alkyds based on trimethylolpropane, dimethylol propionic acid and castor oil were synthesized. The process implied preparing the three samples with ZnO nanoparticles in an amount of 0, 1, and 3 wt%. Commercial melamine resin was used as a crosslinking agent. Curing was carried out firstly in a drying oven at the 120 °C for half an hour, and afterward for seven days at room temperature. Thermal properties, physico-mechanical characteristics, and chemical resistance of cured coated were determined. An increasing amount of the ZnO nanoparticles in hyperbranched alkyd resins leads to the improvement of the properties of the cured coating. Based on the results, it was concluded that the hyperbranched alkyds with ZnO nanoparticles could be employed as binders in environment-friendly coatings due to lower viscosity (less content of organic solvent) compared to conventional alkyd resins.

Respiration of developing castorbean seeds

1971 ◽  
Vol 49 (2) ◽  
pp. 263-266 ◽  
Author(s):  
P. K. Agrawal ◽  
D. T. Canvin
Keyword(s):  
Seed Development ◽  
Pentose Phosphate Pathway ◽  
Respiratory Quotient ◽  
Castor Oil ◽  
Dry Weight ◽  
Pentose Phosphate ◽  
Fresh Weight ◽  
Oil Seed ◽  
Oil Synthesis

The rate of oil synthesis in the developing castor oil seed increased from 0.02 mg oil.day−1.100 mg−1 (dry weight) at 6 days after fertilization to 3.84 mg.day−1.100 mg−1 30 days after fertilization. Thereafter, it decreased with no oil synthesis occurring in seed 54 days after pollination. The rate of respiration of the seed was generally correlated with the rate of oil synthesis and peak respiratory rates of 71 μl O2 and 125 μl CO2.h−1.100 mg−1 (fresh weight) were observed in seeds 27 days after fertilization. The respiratory quotient increased from 1.2 in seed 12 days after fertilization to 1.7 to 1.9 during the period of most rapid oil synthesis. The C6/C1 ratio was always less than 0.5 and indicated that the pentose phosphate pathway was operative at all stages of castor oil seed development.

Isoenzymes of the glycolytic and pentose-phosphate pathways during the development of the castor oil seed

1981 ◽  
Vol 59 (8) ◽  
pp. 1423-1425 ◽  
Author(s):  
Robert J. Ireland ◽  
David T. Dennis
Keyword(s):  
Pyruvate Kinase ◽  
Castor Oil ◽  
Ricinus Communis ◽  
Pentose Phosphate ◽  
Phosphogluconate Dehydrogenase ◽  
Hexose Phosphate ◽  
Oil Synthesis ◽  
Ricinus Communis L ◽  
Oil Plant ◽  
Pentose Phosphate Pathways

Plastid and cytosolic isozymes of pyruvate kinase, hexose-phosphate isomerase, and 6-phosphogluconate dehydrogenase have been isolated and separated from seeds of the castor oil plant (Ricinus communis L.) at different stages of development. These enzymes can be detected 24 days after pollination, when the plastids contain 14% of the total cellular activities of both the pyruvate kinase and hexose-phosphate isomerase and 40% of the 6-phosphogluconate dehydrogenase activities. At this stage the seed consists mainly of nucellus, that is subsequently replaced by endosperm. The activities of the plastid isozymes increase faster than the cytosolic isozymes, until after 40 days, when endosperm fills the seed, the plastids contain 25% of the hexose-phosphate isomerase, 70% of the 6-phosphogluconate dehydrogenase, and 40% of the pyruvate kinase activities. The development of the plastid isozymes correlates with the increase in oil synthesis. This supports a central role for plastids in oil synthesis.

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