Polymerization of Monomeric Reactants (PMR) type of polyimide was prepared using bis(3,5-dimethyl-4-amino phenyl)-4′-methoxy phenyl methane and characterized by elemental analysis, FT-IR, 1 H NMR, and 13 C NMR spectral techniques. Differential scanning calorimetry (DSC) analysis shows that melting and curing take place in the temperature range of 215 to 230 °C and 265 to 315 °C respectively. The uncured and cured prepolymer undergo two step (335 and 583 °C) and single step (537 °C) decomposition respectively. The T 10% and char yield at 800 °C were found to be 465 °C and 46 wt %, respectively. FT-IR and thermogravimetric analysis (TGA) of the heat treated resin powder and prepolymer reveal that imidization takes place in the temperature range 250−275 °C and cross-linking occurs between 275 and 325 °C. The prepolymer was found to undergo photocross-linking. The flexural strength, flexural modulus, and interlaminar shear strength of carbon fiber (T300) reinforced BA4MPM-PMR type composite are 447 MPa, 34 GPa, and 42 MPa, respectively.
Modified PMR prepolymer was prepared using the bis(3,5-dimethyl-4-amino phenyl)phenyl methane and characterized by elemental analysis and Fourier transform infrared (FTIR), proton (1H) and carbon-13 (13C) nuclear magnetic resonance (NMR) spectral techniques. Differential scanning calorimetry analysis shows that melting and curing take place in the temperature range 205–230°C and 255–330°C, respectively. The uncured and cured prepolymer undergo two-step (317 and 347°C) and single-step (559°C) decomposition, respectively. The temperature of 10% weight loss and char yield at 1000°C were found to be 450°C and 36 wt%, respectively. FTIR and thermogravimetric analyses of the modified-PMR resin powder and fully imidized prepolymer, heat treated at different temperatures, reveal that imidization and cross linking happen in the temperature range 250–275°C and 275–325°C, respectively. The prepolymer was found to undergo photo-cross linking (271 nm). Carbon fibre (T300)-reinforced modified PMR composite was found to have a flexural strength of 469 MPa, flexural modulus of 50 GPa and interlaminar shear strength of 34 MPa.
In this invistigation, we assessed the composition of the essential oil from the leaves of Artabortrys hexapetalus (L.f.) Bhandari, in vitro antioxidant and anticancer activities. The hydrodistilled essential oil from A. hexapetalus leaves cultivated in the southern Western Ghats was evaluated by GC/MS for its chemical composition. 34 compounds were present, according to the results of GC/MS analysis. The predominant constituents include Caryophyllene (17.2%), Copaene (12.9%), α-Bisabolene (8.3%), Biocyclogermacrene (6.3%), α-Cadinol (6.2%), β-Myrcene (5.7%), δ- 3-Carene (5.3%), and γ-Muurolene (4.9 %). The minor constituents are Gurjunene (3.5%), Longipinane (3.5%), Patchoulene (3.1%), Trans cadinal (2.8%), Ledol (1.4%), α-Phellandrene (1.3%), and Patchouli alcohol (1.3%). The DPPH and ABTS assays were used to measure the antioxidant activity of the A. hexapetalus essential oil, with ascorbic acid as a reference. The essential oil demonstrated antioxidant activity by having IC50 values of 104 and 122 µl/mL, respectively. Further the essential oil has tested its in vitro anticancer potential using the MTT assay on the HeLa cancer cell line and showed significant anticancer activity with an IC50 value of 36.7 µg/mL.
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