𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐒𝐚𝐦𝐞 𝐫𝐮𝐛𝐛𝐞𝐫 𝐜𝐨𝐦𝐩𝐨𝐮𝐧𝐝. 𝐓𝐡𝐫𝐞𝐞 𝐜𝐮𝐫𝐞 𝐬𝐭𝐚𝐭𝐞𝐬. 𝐓𝐡𝐫𝐞𝐞 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐥𝐲 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥𝐬.

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞

𝐒𝐚𝐦𝐞 𝐫𝐮𝐛𝐛𝐞𝐫 𝐜𝐨𝐦𝐩𝐨𝐮𝐧𝐝.

𝐓𝐡𝐫𝐞𝐞 𝐜𝐮𝐫𝐞 𝐬𝐭𝐚𝐭𝐞𝐬.

𝐓𝐡𝐫𝐞𝐞 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐥𝐲 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥𝐬. 🔬


One is sticky and shapeless; it flows.

One is elastic and strong; it snaps back.

One is brittle and cracked; it fails without warning.


Nothing changed in the formulation.

Only the cure state changed.


𝐂𝐮𝐫𝐞 𝐬𝐭𝐚𝐭𝐞 𝐢𝐬 𝐧𝐨𝐭 𝐚 𝐬𝐢𝐦𝐩𝐥𝐞 𝐬𝐞𝐭𝐭𝐢𝐧𝐠.

𝐈𝐭 𝐝𝐞𝐟𝐢𝐧𝐞𝐬 𝐡𝐨𝐰 𝐦𝐚𝐧𝐲 𝐜𝐫𝐨𝐬𝐬𝐥𝐢𝐧𝐤𝐬 𝐟𝐨𝐫𝐦 𝐛𝐞𝐭𝐰𝐞𝐞𝐧 𝐩𝐨𝐥𝐲𝐦𝐞𝐫 𝐜𝐡𝐚𝐢𝐧𝐬 𝐚𝐧𝐝 𝐡𝐨𝐰 𝐭𝐡𝐨𝐬𝐞 𝐜𝐡𝐚𝐢𝐧𝐬 𝐥𝐨𝐜𝐤 𝐢𝐧𝐭𝐨 𝐚 𝐧𝐞𝐭𝐰𝐨𝐫𝐤.


𝐓𝐨𝐨 𝐟𝐞𝐰 𝐜𝐫𝐨𝐬𝐬𝐥𝐢𝐧𝐤𝐬: 𝐜𝐡𝐚𝐢𝐧𝐬 𝐬𝐥𝐢𝐝𝐞 𝐟𝐫𝐞𝐞𝐥𝐲. 𝐍𝐨 𝐬𝐭𝐫𝐞𝐧𝐠𝐭𝐡. 𝐍𝐨 𝐫𝐞𝐜𝐨𝐯𝐞𝐫𝐲.

𝐎𝐩𝐭𝐢𝐦𝐚𝐥 𝐜𝐫𝐨𝐬𝐬𝐥𝐢𝐧𝐤𝐬: 𝐜𝐡𝐚𝐢𝐧𝐬 𝐚𝐫𝐞 𝐚𝐧𝐜𝐡𝐨𝐫𝐞𝐝 𝐛𝐮𝐭 𝐬𝐭𝐢𝐥𝐥 𝐦𝐨𝐛𝐢𝐥𝐞. 𝐄𝐥𝐚𝐬𝐭𝐢𝐜. 𝐑𝐞𝐬𝐢𝐥𝐢𝐞𝐧𝐭.

𝐓𝐨𝐨 𝐦𝐚𝐧𝐲 𝐜𝐫𝐨𝐬𝐬𝐥𝐢𝐧𝐤𝐬 — 𝐨𝐫 𝐚 𝐝𝐞𝐠𝐫𝐚𝐝𝐞𝐝 𝐧𝐞𝐭𝐰𝐨𝐫𝐤: 𝐜𝐡𝐚𝐢𝐧𝐬 𝐚𝐫𝐞 𝐥𝐨𝐜𝐤𝐞𝐝 𝐫𝐢𝐠𝐢𝐝𝐥𝐲. 𝐒𝐭𝐫𝐨𝐧𝐠 𝐛𝐮𝐭 𝐛𝐫𝐢𝐭𝐭𝐥𝐞. 🌡


Same chains. Same chemistry.

Different crosslink density. Different network. Different material. ⚙️


The rheometer cure curve shows it first.

Swelling tests confirm it.

Tensile and hardness testing prove it in the final part.


This is one of the most important lessons in rubber engineering:


𝐓𝐡𝐞 𝐜𝐮𝐫𝐞 𝐬𝐭𝐚𝐭𝐞 𝐢𝐬 𝐧𝐨𝐭 𝐚 𝐩𝐫𝐨𝐜𝐞𝐬𝐬𝐢𝐧𝐠 𝐝𝐞𝐭𝐚𝐢𝐥.

𝐈𝐭 𝐢𝐬 𝐚 𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐚𝐥 𝐝𝐞𝐜𝐢𝐬𝐢𝐨𝐧.


Engineer's takeaway:

𝐖𝐡𝐞𝐧 𝐚 𝐫𝐮𝐛𝐛𝐞𝐫 𝐩𝐚𝐫𝐭 𝐟𝐚𝐢𝐥𝐬, 𝐝𝐨 𝐧𝐨𝐭 𝐚𝐬𝐬𝐮𝐦𝐞 𝐭𝐡𝐞 𝐟𝐨𝐫𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐢𝐬 𝐰𝐫𝐨𝐧𝐠. 𝐂𝐡𝐞𝐜𝐤 𝐭𝐡𝐞 𝐜𝐮𝐫𝐞 𝐬𝐭𝐚𝐭𝐞 𝐟𝐢𝐫𝐬𝐭.


How do you monitor cure in your process rheometer, DSC, swelling, or something else?

And what has it caught that other methods missed? 💡


source : Peyman Ezzati


#Rubber #Elastomers #PolymerEngineering #PolymerScience #MaterialsScience

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