Apr 3, 2020 · 高密度聚乙烯（HDPE）的分子链非常规整，柔顺性好，因此其Tg低，数值是-80℃。 按常理HDPE在室温下应该为高弹态，展现出橡胶的特性，但是，正因为其分子链规整性很好，它的结晶度很高，能达到60%左右，极高的结晶度使HDPE在室温下硬且强韧，展现出塑料的特性。 另外的，根据PE分子链柔顺性好这一特质，工程师们将聚乙烯（PE）与聚丙烯（PP）共聚，PE中引入的PP链段使PE难以结晶，大大降低了PE的结晶度，使这种共聚物展现出橡胶的 …

What is glass transition temperature (Tg)? What are the units of glass transition temperature? Which type of polymers undergo glass transition? What are the examples of polymers with high or low Tg? What is the difference between Tg and Tm? Why is it important to identify the Tg of polymers? What are the factors affecting Tg?

What is Glass Transition Temperature (Tg)? Glass transition temperature is the temperature at which an amorphous polymer changes from a hard/glassy state to a soft/leathery state, or vice versa. Tg is directly related to a material’s strength and …

玻璃化温度Tg：指无定型聚合物（包括结晶型聚合物中的非结晶部分）由玻璃态向高弹态或者由后者向前者的转变温度。 是无定型聚合物大分子链段自由运动的最低温度，也是无定型塑料制品工作温度的上限。

Oct 14, 2024 · High-density polyethylene (HDPE) exhibits a unique glass transition temperature (Tg), which is essential for its performance in applications. The Tg, along with other properties, such as crystallinity and molecular weight, determines the …

Feb 12, 2024 · Learn the significance of Polyethylene TG in controlling HDPE glass transition temperature for precise plastic injection molding. Explore now!

The glass transition temperature (Tg) is a critical temperature for polymers and plastics, marking the point at which these materials transition from a hard, brittle, and glassy state to a softer, more flexible, and rubbery state. At temperatures below Tg, the polymer chains are frozen in a relatively ordered and rigid structure, akin to a solid.

Tg, glass transition temperature (the plastic becomes brittle below this temperature). Td, heat distortion temperature under a 66 psi load. Cte, coefficient of linear thermal expansion. Tensile Strength, load necessary to pull a sample of the plastic apart. Compressive Strength, load necessary to crush a sample of the plastic.

Oct 13, 2023 · When you heat up a specific type of plastic that doesn’t have a clear shape, it turns into a sticky liquid or feels like rubber at a certain temperature. This specific temperature is called the Glass Transition Temperature, or Tg for short.

高分子材料成型加工技术总结，介绍高分子制品生产知识，涉及橡胶、塑料、弹性体、纤维，复合材料等等。