Synthesis,characterization and thermodynamic properties of poly(3-mesityl-2-hydroxypropyl methacrylate-co-N-vinyl-2-pyrrolidone)

摘要

Poly(3-mesityl-2-hydroxypropyl methacrylate-co-N-vinyl-2-pyrrolidone) P(MHPMA-co-VP) was synthesized in 1,4-dioxane solution using benzoyl peroxide (BPO) as initiator at 60 deg C.The copolymer was characterized by ~1H ~(13)C NMR,FT-IR,DSC,TGA,size exclusion chromatography analysis (SEC) and elemental analysis techniques.According to SEC,the number-average molecular weight (M_n),weight-average molecular weight (M_w) and polydispersity index (PDI) values of PMHPMA-co-VP were found to be 58,000,481,000 g/mol and 8.26,respectively.According to TGA,carbonaceous residue value of PMHPMA-co-VP was found to be 6% at 500 deg C.Also,some thermodynamic properties of PMHPMA-co-VP such as the adsorption enthalpy,DELTA H_a,molar evaporation enthalpy,DELTA H_v,the sorption enthalpy,DELTA H_1~S,sorption free energy,DELTA G_1~S,sorption entropy,DELTA S_1~S,the partial molar free energy,DELTA G_1~(infinity),the partial molar heat of mixing,DELTA H_1~(infinity),at infinite dilution was determined for the interactions of PMHPMA-co-VP with selected alcohols and alkanes by inverse gas chromatography (IGC) method in the temperature range of 323-463 K.According to the specific retention volumes,V_g~0,the weight fraction activity coefficients of solute probes at infinite dilution,OMEGA_1~(infinity),and Flory-Huggins interaction parameters,X_(12)~(infinity) between PMHPMA-co-VP-solvents were determined in 413-453 K.According to OMEGA_1~(infinity) and X_(12)~(infinity),selected alcohols and alkanes were found to be non-solvent for PMHPMA-co-VP at 413-453 K.The glass transition temperature,T_g,of the PMHPMA-co-VP found to be 370 and 363 K,respectively,by IGC and DSC techniques,respectively.