polymerguru

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 𝐆𝐞𝐥 𝐭𝐢𝐦𝐞: 𝟏𝟎𝟎 𝐬𝐞𝐜𝐨𝐧𝐝𝐬 ✓ 𝐑𝐢𝐬𝐞 𝐭𝐢𝐦𝐞: 𝟏𝟏𝟎 𝐬𝐞𝐜𝐨𝐧𝐝𝐬 ✓ 𝐁𝐨𝐭𝐡 𝐰𝐞𝐫𝐞 𝐰𝐢𝐭𝐡𝐢𝐧 𝐭𝐡𝐞 𝐞𝐱𝐩𝐞𝐜𝐭𝐞𝐝 𝐫𝐚𝐧𝐠𝐞. 𝐁𝐮𝐭 𝐭𝐡𝐞 𝐟𝐨𝐚𝐦 𝐬𝐭𝐢𝐥𝐥 𝐜𝐨𝐥𝐥𝐚𝐩𝐬𝐞𝐝. Why? Because gel time and rise time were being checked as two separate numbers. They are not two separate checks. They are one reaction-balance diagnostic. And the diagnostic is the gap between them. In a balanced polyurethane foam system, gel time should occur slightly before rise time like typically by 0–20 seconds. That means the polymer network reaches critical viscosity just as the foam finishes expanding. The structure has enough strength to hold the final rise height, lock the cells, and maintain stable volume. But when the gap moves in the wrong direction, the defect tells the story. If rise leads gel by more than 20 seconds😊 : The blowing reaction is ahead of the gelling reaction. Foam expands before the polymer network has eno...

 Sunday's THOUGHTFUL Post 𝗧𝗵𝗲 𝗲𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁𝗮𝗹 𝗶𝗺𝗽𝗮𝗰𝘁 𝗼𝗳 𝗱𝗼𝗶𝗻𝗴 𝘁𝗵𝗲 𝘄𝗿𝗼𝗻𝗴 𝘁𝗵𝗶𝗻𝗴 𝘁𝗼 “𝗦𝗔𝗩𝗘” 𝘁𝗵𝗲 𝗲𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁. Back in the late 80s and 90s, I was a young polymer sales executive. I was lucky to be coached by a knowledgeable old Scotsman who taught me one of the most important lessons in materials selection. Customers would call and ask: “We want to make product X. What material should we use?” Which polymer? Which grade? Could paper work for part of the application? Should it all be plastic? Was there a better material? Back then, nobody asked whether it was sustainable or recyclable. Recycled plastic was used widely, but mostly because it reduced cost. Many converters blended it with virgin material, or used it at 100% in industrial applications, because it was cheaper. But the core rule was clear: Start with the performance requirements. Then recommend the best material for the job. Even if that meant losing the sale. Even if...

OCSiAl, the global leader in the industrial production of single wall carbon nanotubes, has been named as a supplier to PowerCo, the battery manufacturing subsidiary of Volkswagen Group, for its Unified Cell battery platform. “Today, batteries containing OCSiAl nanotubes power around one million electric vehicles worldwide. In the PowerCo project, we supply nanotube solutions for graphite anodes,” said Gregory Gurevich, Senior Vice President at OCSiAl. “Single wall carbon nanotubes significantly enhance the electrical conductivity of graphite anodes and improve heat dissipation, enabling battery cells to operate at higher charging and discharging currents without overheating. These advanced conductive additives are essential for high-performance battery platforms produced at industrial scale.” Nanotubes for PowerCo will be supplied from OCSiAl's production facility in Serbia, helping increase local sourcing of critical battery materials within Europe. The facility has met stringent...