Chain-length-dependent termination rate constant: Effect on molecular weight distributions formed by pulsed laser radical polymerization

作者: Anatolij N. Ntkitin , Alexander V. Evseev

DOI: 10.1002/MATS.1997.040060610

关键词: RadicalPhotopolymerConstant (mathematics)Analytical chemistryRadical polymerizationPolymer chemistryPolymerizationLaserChemistryMolar mass distributionReaction rate constantInorganic chemistryOrganic chemistryMaterials ChemistryPolymers and PlasticsCondensed matter physics

摘要: For polymerization initiated by an arbitrary sequence of laser pulses a numerical technique for calculating molecular weight distributions (MWDs) is developed, which takes into consideration the chain length dependence termination rate constant k t . The MWDs methyl methacrylate and styrene are calculated use 0 values (for law ij = (i) -a radicals with i) averages (i, j) constants different degrees polymerization) taken from literature. dependences overall (k ) on initiation parameters (pulse repetition (v) pulse intensity periodic pulses) presented. Two methods proposed determination : a) experiments where monomer-to-polymer conversions per determined v; b) packets p (the propagation), can be simultaneously MWD. both simple analytical equations derived evaluation constants. limits application MWD calculation.

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