you may find the following useful.

Article Cross Linked Sulphonated Poly(ether ether ketone) for the De...

also you can see the following:

Polymer Free Volume and Its Connection to the Glass Transition

Macromolecules, 2016, 49 (11), pp 3987–4007

Good day Nurul,

on aged butadienes I've seen that the low Tg value will slightly shift to a higher temperature and TanD curve will deminish. The more the x-links are broken down over time (ageing), the more TanD diminish. I hope this will help!

Dear all, both factors are interconnected. Tg is a second order transition, it is assumed (in polymers) to a type of segment rotation in a mouvement similar to a 'crank shaft'. An increase in the x-link density reduces authomatically the free volume rendering such type of mouvements impeded. This is why Tg shifts to higher values and may reach the decompositon or degradation temperature since there is no possibility for melting once it is fully cured or x-linked. Best Regards

Cross-link affects the chain mobility and it networks. It increases the elastic modulus and decreases the tan delta at Tg due to lower mechanical loss. There may not be an significant shift in Tg as such.

I agree with Abdulkader. The increase in crosslink density makes it difficult for segmental mobility during glass transition. It requires more energy at higher crosslink density and shifts the Tg to higher temperature. Similarly tandelta will shift to higher temperature. The damping value will be lower due to resistance in mobility.