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Study on Synthesis and Properties of Linear Amino-Polystyrene

Author: GuoJuanLi
Tutor: ZhaoHongChi
School: Hebei University
Course: Polymer Chemistry and Physics
Keywords: Aminated polystyrene Nitrification Reduction reaction Chloroacetylation reaction Chloromethylation reaction Amination Thermal stability Glass transition temperature Polystyrene
CLC: TQ325.2
Type: Master's thesis
Year: 2010
Downloads: 109
Quote: 0
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Abstract


Functional polymer materials with a wide range of applications, which the aminated polystyrene their with protonated amino, can widely used in biomedical polymer the polymer catalyst support in many areas such as adsorption resins and water treatment. Linetypes aminated polystyrene prepared three synthetic routes were studied, and the structure and properties of the polymer. (1) mixed acid as a nitrating agent in concentrated HN03 / concentrated H2SO4 homemade linear polystyrene (PS) nitration prepared poly nitrostyrene (PPnS), then PPNS restore aminostyrene is poly (PPAS ). Infrared spectroscopy (FT-IR), nuclear magnetic resonance spectrometer (NMR), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) polymer characterized. The effects of reaction temperature, time and ratio of mixed acid nitrification and the type and amount of reducing agent for the reduction reaction. The results show that: introduced on the benzene ring of PS the nitro Preparation of the PPNS, PPNS be restored PPAS; PPNS PPAS average two stage thermal decomposition and PS PPNS the PPAS thermal stability in turn reduce. The PPNS the glass transition temperature (Tg) is increased with the increase of the nitrification rate. The reaction temperature was increased to extend the reaction time and to increase the volume of the sulfuric acid in the mixed acid, the nitration rate improve. Reduce the molecular weight of the PS, as well as to improve the water-soluble in an amount of the reducing agent, PPAS improve. (2) with chloroacetyl chloride as the acylating reagent, AlCl3 as catalyst, synthetic poly-chloroacetyl-styrene (PS-Acyl-Cl), and then with ethylenediamine (EDA) to the aminated reagent on the PS-acyl The-Cl amination to give poly-(a-aminoethyl the amine) acetyl styrene (PS-Acyl-EDA). By FT-IR, TGA and DSC of polymer structure and performance studies investigated the reaction conditions affect the acetylation reaction of chlorine and amination. The results show that: prepared PS-Acyl-Cl and PS-Acyl-EDA. They are divided into two stages of thermal decomposition; the degree of substitution increased as the chloroacetyl group, the lower the thermal stability of PS-Acyl-Cl, but Tg increased. (3) use of 1,4 - butanediol, formaldehyde, phosphorus trichloride was prepared from chloromethylated reagent - 1,4 - dichloro-methoxybutane, as chloromethylated reagent The Lewis acid catalyst, preparation of a poly-chloromethyl styrene (PS-Meyl-Cl) and amination of poly (aminoethyl the amines) methyl styrene (PS-Meyl-EDA). FT-IR, TGA of polymer structure and performance, the effects of reaction conditions, the impact of the the chloromethylation reaction and amination. The results showed that: Preparation of PS-Meyl-Cl and PS-Meyl-EDA, which are divided into two stages of thermal decomposition; lower the thermal stability of the degree of substitution increased as chloromethyl, PS-Meyl-Cl. Considering the various factors to determine the optimum conditions for the preparation of PS-Meyl-Cl and PS-Meyl-EDA's.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polystyrene and its copolymers
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