Kinetic Analysis of the Amphiphilic Star Block Copolymerization

Macromol. Theory Simul.

Hao

Yan

2015

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The kinetic model of the amphiphilic copolymers with hyperbranched core and linear arms was developed for both semibatch and one‐pot polymerization. The molecular size distribution functions of the species obtained and the various molecular parameters were analytically derived. The topological structures and molecular parameters of the products depend on initial mole feed ratios of the reactants. Under the same reaction conditions, the polydispersity index of the products resulted from semibatch is smaller than that of the one‐pot process and there are more terminal units on the surface of hyperbranched macroinitiators from semibatch process. Accordingly, the topological structures of the amphiphilic hyperbranched copolymers and the successive self‐assembly shapes can be designed by the suitable initial conditions of the polymerization.

Section: Introductionmentioning

confidence: 99%

Kinetic Model of the Amphiphilic Copolymers with Hyperbranched Core Formed by AB₂Monomer and B_fInitiator

Macromol. Theory Simul.

Hao

Yan

2015

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Kinetic Analysis of A₂ + AB₂ Polymerization Approach

Macro Theory & Simulations

Wang

Yan

2012

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The kinetic model of the co‐polycondensation with A2 and AB2 type monomers is developed and the analytical expressions of the various molecular parameters of the products are derived rigorously. The monomer feed ratio (α) of A2 to AB2 significantly affects the molecular parameters and the critical condition of gelation. Gelation can be avoided if α is >$1 + \sqrt {3} /2$. At the critical state, the degree of branching decreases firstly and reaches its minimum value at about α≈0.22. Then, it increases with increasing α‐value. In comparison with experimental results, non‐equal reactivity of the active groups should be considered.

The Radius of Gyration of the Products of Hyperbranched Polymerization

Macro Theory & Simulations

2014

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The average mean‐square radii of gyration for the products of the linear polymerization, the star‐shaped polymerization, and the hyperbranched polymerization of AB2‐type monomer in the absence or presence of a multifunctional core initiator are investigated using the Dobson‐Gordon's method. The dependence relationships between the average radii of gyration and the average degree of polymerization calculated using the Dobson‐Gordon's method for the linear polymerization products are in good agreement with those obtained from the matrix algebra method of the rotational isomeric state model. The radii of gyration of the star‐shaped and hyperbranched polymers are much smaller than those of the linear polymers if their average degrees of polymerization are equal. The conversion of groups, the core/monomer feed ratio, and the core functionality affect the average radius of gyration of the products. However, compared with the other factors, the degree of polymerization is the most influential factor on the average radii of gyration for the hyperbranched polymer system.