How to measure the cross -linking density of epoxy resin?

DMA method, make a film, and then use DMA stretching mode

Hello buddy, I am also asking for this question, do you know how to do it ~

In the method you mentioned, you should have a 100%absolute value? 碜鲗 ρ?
My method, you can refer to:
1. Functional base titration:
Epoxy has weight.. EEW can be counted as a volume .. After the reaction .. Titian remaining unprepared epoxy base .. You can calculate the proportion .. as the cross -linking density.
A SAMPLE has been running .. It has not changed to TG .. For example: 1st TG \u003d 100..2nd TG \u003d 110..3rd TG \u003d 120..4th TG \u003d 121..5th TG \u003d 122 ...
WeIt can be assumed that tgf \u003d 120 ... assumes that the cross -linking density is 100%
and then measure the tg to be tested. Compared with it.
3. Dissolt the method:
Before the weight of the reaction...A ... Assuming the reaction process .. No one is losing .. After the reaction, the medium quantity is still A
A solvents are used to heat the solvent (the solvent must be soluble solvents in the reactor) .. Thermal solubility timeAssuming that after 24HR
24HR .. Put the dissolved objects in the oven and dry the scale .. It is b
b/a \u003d\u003d \u0026 gt; cross -linking density
4. IR functional base area reduction method:
The above for reference !! You can correct it yourself