ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The acceptor monomers maleic anhydride (MSA), itaconic anhydride (ISA), N-phenylmaleimide (NPI) and N-cyclohexylmaleimide (CMI) were combined with the donor monomers styrene (ST), butyl vinyl ether (BV) and N-vinyl-2-pyrrolidone (NVP) and studied by means of UV spectroscopy using CT bands. In this manner, the 1:1 stoichiometry of the CT complexes, the equilibrium constant in the range of 20°C to 60°C, and the thermodynamic equilibrium data were determined. Additionally, Monte-Carlo simulations of the donor-acceptor combinations in the presence of solvent molecules were run. The cohesion energies calculated from these simulations were used to quantify the donor-acceptor interactions and showed good agreement with the UV spectral data. The acceptor strength decreases in the order MSA 〉 NPI 〉 ISA 〉 CMI, the donor strength in the order of NVP 〉 ST 〉 BV. In the free radical solution copolymerization of the systems NVP/NPI, BV/NPI, acrylonitrile (AN) AN/CMI, AN/NPI, MSA/CMI and MSA/NPI, the reaction rate and molecular weight dependence on the monomer combination, as well as the r-values were determined. Using the Kc-values, conclusions were drawn concerning the different reaction mechanisms. The properties of the polymers were investigated using differential scanning calorimetry (DSC) and thermogravimetry.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
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