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Method for determining styrene micro-emulsion polymerization conversion rate by ultraviolet spectrometry

A technology of microemulsion polymerization and ultraviolet spectroscopy, which is applied in the field of determining the conversion rate of styrene microemulsion polymerization, can solve the problems of poor accuracy, loss of polymerization products, and difficulty in accurately measuring the conversion rate of styrene, achieving high accuracy, easy operation, The effect of simple method

Inactive Publication Date: 2006-08-09
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The measurement method of the conversion rate of styrene at present, the gravimetric method that is used more at home and abroad, this method needs to carry out operations such as washing, filtering, drying, can bring the loss of polymerization product in these operating procedures, and accuracy is relatively poor, Especially when the conversion rate is small, it is more difficult to accurately determine the conversion rate of styrene in the microemulsion polymerization process

Method used

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  • Method for determining styrene micro-emulsion polymerization conversion rate by ultraviolet spectrometry
  • Method for determining styrene micro-emulsion polymerization conversion rate by ultraviolet spectrometry
  • Method for determining styrene micro-emulsion polymerization conversion rate by ultraviolet spectrometry

Examples

Experimental program
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Effect test

Embodiment 1

[0014] A system consisting of 3.8ml styrene, 3.4ml n-pentanol, 3.5gSDS, and 70.0ml water was reacted for 90 minutes at an ultrasonic frequency of 19.6kHz, a power of 180W, and 30°C. 1ml was sampled, and 100ml of 95% ethanol was added to precipitate and separate Polymer, then take 1ml of the supernatant, dilute 50 times with 95% ethanol, and measure the absorbance of the diluted sample at 247nm as 0.5640 with a UV spectrophotometer. Find that the concentration of styrene in this diluted sample is 3.94 * 10 by accompanying drawing (Fig. 1). -5 mol L -1 , that is, the concentration of styrene in the reaction system is 0.197mol L -1 According to the above formula, the conversion rate of styrene can be obtained to be 53.7%.

Embodiment 2

[0016] A system consisting of 4.0ml styrene, 3.5ml n-pentanol, 4.0gSDS, and 72.5ml water was reacted for 60 minutes at an ultrasonic frequency of 19.6kHz, a power of 180W, and 40°C. 1ml was sampled, and 100ml of 95% ethanol was added to precipitate and separate Polymer, then take 1ml of the supernatant, dilute 50 times with 95% ethanol, and measure the absorbance of the diluted sample at 247nm as 0.4629 with a UV spectrophotometer. Find that the concentration of styrene in this diluted sample is 3.25 * 10 by accompanying drawing (Fig. 1). -5 mol L -1 , that is, the concentration of styrene in the reaction system is 0.163mol L -1 According to the above formula, the conversion rate of styrene can be obtained as 62.7%.

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Abstract

Said invention discloses ultraviolet spectrometry determining styrene micro emulsion liquid conversion rate method in order to composing styrene, 1-pentanol, SDS and H2 O reaction system. Said cinnamic initial concentration C0 is 0.4 mol L-1.2mol L-1,Polymerization temperature as 20-60 degree centigrade, sampling in plurality of time quantum in process of ultrasound trigering micro emulsion liquid polyreaction, to proceed precipitation pretreatment using 95 per cent ethanol as precipitant, then taking supernatant, using 95 per cent ethanol dilution Cinnamic concentration as 9 X10-6 mol L-7X10-6 mol L, adopting ultraviolet spectrophotometer determining said rare faction cinnamic absorbance in 200 nm-300 nm position, through absorbance-styrene concentration relationship chart and extension rate calculating polymeric system styrene concentration C, according to x ú¢ c 0- 0- c ) / c 0 ] * 100 % calculating cinnamic conversion rate. Said invented method is simple, easy operation, and high sensitivity.

Description

technical field [0001] The invention relates to a method for measuring the conversion rate of styrene microemulsion polymerization, in particular to a related technology for measuring styrene concentration by ultraviolet spectroscopy. Background technique [0002] There are many polymerization methods for polystyrene, and microemulsion polymerization is one of them. Microemulsion is a transparent and thermodynamically stable oil-water dispersion system. As a thermodynamically stable system with narrow distribution and particle size between 10 and 100 nm, it is a polymerization method for preparing polymer particles with small particle size and narrow distribution. Microemulsion polymerization has many advantages, such as fast reaction speed, easy heat dissipation, stable reaction at low temperature, no constant rate period, no gel effect, no stirring, simple polymerization device, easy operation, and controllable particles. [0003] The particle size of polystyrene microemu...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 王雅琼许文林辛洪群
Owner YANGZHOU UNIV
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