JUYE Technology, a TPE thermoplastic elastomer manufacturer with 19 years of experience — provides you with comprehensive R&D and production solutions for TPE, TPR, TPV, TPV-SiR, TPU, and TPEE materials.
Since 2008, we have expanded into a broad range of industry application markets, providing rich solutions for various industries, with numerous application cases for your reference.
JUYE Technology's sustainable development aims to carry out low-carbon production under the premise of protecting the Earth's green environment, participate in global economic cooperation and innovation practices, establish harmonious and symbiotic relationships with partners, contribute to the country, promote the development of the enterprise, and seek welfare for employees.
1. Effect of temperature: Different TPE materials have different sensitivities to temperature. For example, when measuring the melt flow index, you can test at several temperatures. If the melt flow index varies greatly, it indicates that the viscosity of the TPE material is highly sensitive to temperature, making it suitable for extrusion materials. 2. Effect of low molecular weight additives
1. Effect of temperature
Different TPE materials have different sensitivities to temperature. For example, when measuring the melt flow index, you can test at several temperatures. If the melt flow index varies greatly, it indicates that the viscosity of the TPE material is highly sensitive to temperature, making it suitable for extrusion materials.
2. Effect of low molecular weight additives
Low molecular weight additives can reduce the interaction force between macromolecular chains, thereby reducing viscosity and making it easier to fill the mold. This is easy to explain: small molecule additives can be understood as added mineral oil.
3. Effect of molecular weight
The same TPE material can have different molecules and molecular weight distributions. The larger the molecular weight, the stronger the intermolecular force, and the higher the viscosity. When the molecular weight is the same, a narrower molecular weight distribution often results in lower viscosity. For example, TPE base material YH503T has higher viscosity than YH502.
4. Effect of shear rate
Effectively increasing the shear rate of plastic can reduce the melt viscosity, but different plastics are affected differently by shear rate. When measuring the melt flow index, you can test at several pressures. If the melt flow index varies greatly, it indicates that the material viscosity is highly sensitive to shear, making it suitable for injection molding materials.
5. Effect of pressure
Although high injection pressure can increase injection speed and achieve high shear during the injection process, which seems beneficial for reducing viscosity, from a physical perspective, increasing pressure actually increases the melt viscosity. The reason is simple: there is already excess space between macromolecular chains due to intermolecular forces. Increased pressure reduces the distance between molecules, making the movement of molecular chains more difficult, thus increasing the overall flow viscosity.
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