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Statistics of AB_g Type Hyperbranched Polymers

Author: SongJianMin
Tutor: WangHaiJun
School: Hebei University
Course: Polymer Chemistry and Physics
Keywords: The degree of response Partition function Fluctuations Glass transition temperature
CLC: O631.3
Type: Master's thesis
Year: 2007
Downloads: 5
Quote: 0
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Abstract


Hyperbranched polymer has a low viscosity , no chain entanglement and good solubility characteristics , is expected to have a good prospect in terms of functional materials , bio - pharmaceutical , and clinical medicine . The hyperbranched polymer research today , from experimental and theoretical aspects of hyperbranched reaction ABg system and explore the use of statistical theory . The paper is divided into three parts , the main contents are as follows : Chapter 1 : Overview . A simple review of research and progress in recent years hyperbranched polymer , and from a theoretical point of view a more detailed summary of the work of other researchers . Chapter 2 : Statistical Theory of ABg hyperbranched polymer . We apply the principle of statistical mechanics , hyperbranched reaction ABg system balance characteristics from two different angles , the analytical expression of the relationship between balance free energy of the system as well as the extent of reaction with thermodynamic quantities . Further pointed out that the two new methods of distribution function of the number of hyperbranched polymer , and combined with the improved polymer lattice fluid theory of polymerization on the impact of the system of equations of state . Hyperbranched polymer ABg fluid equation of state , to discuss the formation of chemical bonds for the system volume , the correction of the equation of state pointed out that the number of bonding . Then , the whole system is divided into a number of subsystems and to study the molecular number density and bonding within the subsystem number density fluctuation and fluctuation spatial correlation . Further system \As an application, the van der Waals interaction between fluid , for example, bonding of such fluid . Finally, a glass transition temperature of the hyperbranched polymer systems have been studied by the impact of the dot density of the end groups and branched to obtain a form of the glass transition temperature and the degree of reaction of the system of analytic expression , and to explore the extent of reaction on the glass transition temperature the impact . Chapter 3: prospects and outlook . Predict the theoretical research direction hyperbranched polymer summarizes our part continue to study the subject .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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