Thermodynamic Properties of a Binary Self-condensing Vinyl Polymerization System in the Presence of Core Initiators†

doi:10.7503/cjcu20150098

Abstract

Abstract:

A self-condensing vinyl polymerization system consisting of $B * f$ initiating cores and AB^* inimers was studied by the principle of statistical mechanics. As a result, the internal energy, specific heat, polydispersity index and the mean square radius of gyration of hyperbranched polymers were investigated from viewpoint of thermodynamics. In detail, the effect of some reaction conditions, such as temperature, molar ratio of reactants, volume fraction and the functionality of initiating core, were taken into account. The results show that hyperbranched polymers with expected structures and properties can be prepared by means of optimizing parameters of the reaction condition.

Key words: Self-condensing vinyl polymerization system, Reaction condition, Internal energy, Specific heat, Mean square radius of gyration

CLC Number:

O631
O642

TrendMD:

ZHAO Zuofei, LI Yuanfeng, YAO Ning. Thermodynamic Properties of a Binary Self-condensing Vinyl Polymerization System in the Presence of Core Initiators^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1648.

Figures/Tables 8

Fig.1 Effect of internal energy at f=3, r=1×10-4 for ϕ =0.1(a), ϕ =0.3(b) and ϕ =0.7(c)

Fig.2 Effect of the specific heat at f=3, r=1×10-4 for ϕ =0.1(a), ϕ =0.3(b) and ϕ =0.7(c)

Fig.3 Effect of PI(a—c), PIc(a'—c')(A) and PIˉ(a—c)(B) of hyperbranched polymers at f=3, ϕ=0.5 for r=1×10-4(a, a'), r=2×10-4(b, b') and r=3×10-4(c, c')

Fig.4 Effect of PI(a—c), PIc(a'—c')(A) and PIˉ(a—c)(B) of hyperbranched polymers at f=3, r=1×10-4 for ϕ=0.1(a, a'), ϕ=0.3(b, b') and ϕ=0.7(c, c')

Fig.5 Effect of PI(a—c), PIc(a'—c')(A) and PIˉ(a—c)(B) of hyperbranched polymers at ϕ=0.5, r=1×10-4 for f=3(a, a'), f=4(b, b') and f=5(c, c') Inset of (A) is PIc vs. low βε value.

Fig.6 Effect of <R2>2(a—c) and <R2>2c(a'—c') of gyration at f=3, ϕ=0.5 for r=1×10-4(a, a'), r=3×10-4(b, b') and r=5×10-4(c, c')

Fig.7 Effect of <R2>2(a—c) and <R2>2c(a'—c') of gyration at f=3, r=1×10-4 for ϕ=0.1(a, a'), ϕ=0.3(b, b'), ϕ=0.7(c, c')

Fig.8 Effect of <R2>2(a—c) and <R2>2c(a'—c') the mean square radius of gyration at ϕ=0.5, r=1×10-3 for f=3(a, a'), f=4(b, b'), f=5(c, c')

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