The tetrafunctional epoxy resin of bisphenol-C was cured using bismaleamic acids of maleicanhydride and 4,4'-diaminodiphenylsulfone, 4,4'-diaminodiphenylether, and 4,4'-diaminodiphenylmethane and characterized by infrared, differential scanning calorimetric, and thermogravimetric analysis. Cured resins showed endothermic transition at about 229-248°C, which supplemented decomposition reactions. Cured resins are thermally stable up to about 200-230°C and followed two-step decomposition reactions. A 34-56% residue at 600°C supplemented the formation of highly thermally stable cross-linked products. Glass composites showed 133-153 MPa tensile strength, 223-290 MPa flexural strength, 7520-8015 MPa flexural modulus, 33-38 kg m −2 impact strength, 37-40 Barcol hardness, 8.3-12.3 kV mm −1 electric strength, 8.9 × 10 12 to 4.2 × 10 14 ohm cm volume resistivity, and 13-14% water absorption. Good thermal, mechanical and electrical properties and excellent hydrolytic stability of the glass composites signify their industrial importance for low load bearing housing, electrical, and marine applications. C
Epoxy methacrylate of bisphenol-C-jute/treated jute and their sandwich composites of white coir, brown coir, wild almond, bamboo, betel nut, and palmyra were prepared by a compression molding technique under 5MPa pressure and at room temperature for three h. The neat sample showed almost double tensile strength than its jute composite, while it is comparable for treated jute. The composites revealed substantially improved flexural strength compared to neat. The neat, jute/treated jute and their sandwich composites indicated good impact strength, pretty good Barcol hardness, and fairly good electric strength. The neat sample showed excellent volume resistivity, while jute/treated jute and their sandwich composites revealed reasonably good volume resistivity. The composites showed high water ingress tendency, excellent hydrolytic stability, and different diffusivity in different environments at 30oC. Water ingress trend was observed the same for all the composites in different environments, and it is H2SO4 > HCl >NaOH >H2O>NaCl. The sandwich composites may find their applications as low-cost housing and insulating materials and also for marine vessels.
Compression-molded epoxy methacrylate of bisphenol-C-jute/treated jute-banana/groundnut/ cane sugar/pineapple leaf/rice husk/wheat husk sandwich composites were fabricated under 5 MPa pressure at room temperature for 3 h. Alkali treated jute-natural fiber sandwich composites displayed considerably improved mechanical properties over untreated jute-natural fiber sandwich composites due to surface modification of the jute fibers. Both types of sandwich composites showed high water uptake tendency, excellent hydrolytic stability against acids, alkali, and salt solutions, and also a longer equilibrium time at 30oC. Alkali treated sandwich composites revealed a considerably lower water uptake tendency than untreated sandwich composites. Observed water uptake trend is H2SO4 > HCl >NaOH >H2O>NaCl.
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