Dear Lwin Thu, these RG links provide good information answering the question. My Regards

https://www.researchgate.net/publication/267398132_A_TECHNICAL_REVIEW_ON_RUBBER

https://www.researchgate.net/post/How_does_cross_linking_affect_storage_modulus

https://www.researchgate.net/publication/232936491_Influence_of_Crosslink_Density_on_Mechanical_Properties_of_Natural_Rubber_Vulcanizates

Dear Lwin Thu,

I have attached one article which explained the effect of cross link density on elongation% and other properties. I hope it would be useful.

Hi

In my view when cross linking increases elongation decreases.

Increase of cross linking reduce the free volume, which intern converts the rubber or plastic more brittle. Thus more brittleness automatically reduces the persent age of elongation.

Best.

I agree the V R Arun Prakash's view. usually ,when you increase cross linking ,the elongation decreases.just like increasing the cross linking,the curing can be become to strong, when you put the cross linking into the suitable liquid resin, the liquid resin can be become to solid, the solid is the maxlimte,at the same time, the elongation can be lower appreciably.you can get the data by the test.

Thanks for the responses

I agree the V R Arun Prakash's view.

Hi

Generally increasing cross linking density can decrease elongation % ,but to reaching a good rubber you should have a good network with relatively many junction points in the network till can take a good ductile and coherent rubber. For increasing elongation % you can use a flexible cross linker in your synthesis if you are working in lab or add a flexible polymer or segments in your network to get a coherent and resistance network and with a sufficient elongation%.

The best candid is silicone adding to your network for increasing elongation%.

Good Luck Lwin Thu

Ali Khaleghi

Sahand University of technology

JRG(Jalili research group)

Thanks for appreciation Hongjun Yang and Jamal Babawati

I agree the V R Arun Prakash's view.

In general, increase cross linking increases tensile strength, Young modulus and decreases elongation of polymers.