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　　了解PE胶袋的特点：

　　Understand the characteristics of PE bag.

　　PE胶袋大量使用的常为低密度(高压)聚乙烯。聚乙烯为蜡状，有蜡一样的光滑感，不染色时，低密度聚乙烯透明，而高密度聚乙烯不透明。聚乙烯是通过乙烯的加成反应和聚合反应，由重复的-CH2-单元链接而成的高聚合链。聚乙烯的性能取决于它的聚合方式;在中等压力有机化合物的催化条件下进行聚合而成的高密度聚乙烯。这种条件聚合的聚乙烯分子是线性的，且分子链很长，分子量高达几十万。如果是在高压力，高温过氧化物催化条件下自由基聚合，生产出的则是低密度聚乙烯它是支化结构的PE胶袋。

　　PE plastic bags are often used for low density polyethylene (HDPE). Polyethylene is a wax like, waxy, smooth feeling, without dyed, low density polyethylene transparent, and high density polyethylene is opaque. Polyethylene by ethylene addition reaction and polymerization reaction by -CH2- and repeat unit link polymer chain. The properties of polyethylene are determined by its polymerization; high density polyethylene (HDPE), which is polymerized under the catalysis of medium pressure organic compounds. The polymerization of polyethylene molecules is linear and has a long molecular chain with a molecular weight of hundreds of thousands. If high pressure and high temperature peroxide catalyze the free radical polymerization, the production of low density polyethylene is a branched PE bag.

　　聚乙烯不溶于水，吸水性很小，就是对一些化学溶剂，如甲苯、醋酸等，也只有在70℃以上温度时才略有溶解。但是微粒状的聚乙烯，也可以在15℃-40℃之间随温度的变化融化或凝固，温度升高时融化，吸收热量;温度降低时凝固，放出热量。又因为它吸水量很小，不易潮湿，有绝缘性能，因此是很好的建筑材料。

　　Polyethylene is not soluble in water, water is very small, is of some chemical solvents, such as toluene, acetic acid, and only at a temperature of 70 degrees Celsius above slightly dissolved. However, particulate polyethylene can also be melted or solidified with temperature at 15 -40 C, when the temperature rises, it will melt and absorb heat. When the temperature decreases, it will release heat when solidifying. It is also a very good building material because it has small water absorption, not easy to damp, and has insulation property.