addition polymerization


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ad·di·tion pol·y·me·ri·za·tion

(ă-dishŭn poli-mĕr-ī-zāshŭn)
A chemical reaction in which a higher molecular weight product is produced by addition of simpler compounds.
References in periodicals archive ?
where [K.sub.BTA/HQ] is the reaction rate constant for the reaction between BTA and HQ during the Michael addition polymerization of BMI/BTA in the presence of HQ at T, [HQ] is the concentration of HQ.
Figure 5a shows a representative computer modeling result of the Michael addition polymerization of BMI/ BTA in the presence of HQ in NMP at 403 K.
Some general features of [eta](t) are (i) the effect of [eta](t) on the Michael addition polymerizations of BMI with BTA in a particular solvent decreases rapidly with decreasing temperature and (ii) the influence of [eta](t) on the polymerizations in different solvents in increasing order is: DMF < DMAC [much less than] NMP.
The general feature of the kinetic data obtained from the Michael addition polymerizations of BMI/BTA in the presence of HQ in NMP at different temperatures was described in detail elsewhere (5) and it will not he reproduced herein.
The general validity of the mechanistic model was further verified by comparing the experimental data with the model predictions for the Michael addition polymerizations of BMI/BTA in the presence of HQ in different solvents (NMP, DMAC, or DMF) in the temperature range 383-423 K, as shown in Fig.
The data of [K.sub.M] as a function of T thus obtained from the Michael addition polymerizations of BMI/BTA [2/1 (mol/mol)] in different solvents can be expressed in Arrhenius form (Eq.
The initial composition of the reaction mixture ([theta]) must be determined before the computer simulation for the isothermal Michael addition polymerizations of BMI with BTA can be carried out.
The value of [E.sub.a] (= -slope X R) for the Michael addition polymerizations of BMI/BTA (2/1 (mol/mol)) is estimated to be 36.1 kJ [mol.sup.-1], which is quite comparable to that (43 kJ [mol.sup.-1]) obtained from the Michael addition polymerizations of BMI with 4,4'-diaminodiphenylmethane (16).
Reproducibility of the Michael addition polymerizations of BMI/BTA (2/1 (mol/mol)) in the presence of HQ (HQ/BTA = 1/1 (w/w)) and their reaction rate constants at different temperatures.
To further illustrate the effect of the diffusion-controlled polymer reactions, the [X.sub.M] versus t data obtained from the Michael addition polymerizations of BMI with BTA at 383, 403, and 423 K taken from Fig.
Rheological data for the Michael addition polymerizations of BMI/BTA (2/1 (mol/mol)) in the presence of HQ (HQ/BTA = 1/1 (w/w)) at different temperatures for 1 h.
CONCLUSIONS The isothermal Michael addition polymerizations of N, N'-bismaleimide-4, 4'-diphenylmethane (BMI) and barbituric acid (BTA) with BMI/BTA = 2/1 (mol/mol) in 1-methyl-2-pyrrolidone were investigated independently in this work.