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Sunday, 22 September 2019

Degree of crosslinking of styrene-alkyd resin

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Sunday 04 June 2000 1:00:00 am

I want to know an analytic method for measuring the degree of crosslinking of styrene-alkyd resin.

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Thursday 08 June 2000 1:00:00 am

I do not know any ISO-method, but many times I have used swelling experiments to find differences in degree of crosslinking between chemically similar samples. Therefore you need to find a suitable solvent (toluene,xylene), swell well-defined samples and measure the degree of swelling volumetrically. For more information you should also determine the modulus. Of course, the interaction between solvent and polymer is usually the big unknown, but for comparison these data can be usefull.
Regards, Frans Paap

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Monday 12 June 2000 1:00:00 am

A good way to measure degree of polymerization is to weight the sample right after the reaction. Then place the sample in an oven set at 5º above the boiling point of styrene for about 10 minutes. Then re-weight to find out how much 'free styrene' was left in the system after polymerization.

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