Plastic products play a very important role in life. They have low manufacturing cost, durability, good waterproof performance, light weight, can be molded into different shapes, and are easy to use. Today I will take you to understand its related content.
In winter, many plastic products will harden. What causes this? The polymer compound obtained by the polycondensation reaction of plastics is very close between molecules. Low molecules are generally liquid, insoluble in water, low density, and can be used as coatings. High molecular weights are generally solid and the color is milky white. Different from low molecular weight, its thermoplasticity is relatively large, it feels like wax, it has strong corrosion resistance and good insulation performance.
These molecules are insoluble in water and have very weak water absorption. Small molecular weight polyethylene will melt or solidify with temperature changes. It will melt when the temperature is high, and it will solidify when the temperature is low, absorbing heat. The plastic barrels we use daily are relatively soft The reason is that plasticizers are added during production.
These accelerators can allow molecules and molecules to move freely, so the plastic will become soft, and some plasticizers are not cold-resistant, and the effect will be weaker in low temperature conditions in winter, causing the plastic to harden, and the temperature will rise. Restore as before.