什么是(shi)"晶點"?
晶(jing)(jing)點(dian)(dian)實際上是"過度(du)聚(ju)(ju)(ju)合物".即晶(jing)(jing)點(dian)(dian)部位(wei)聚(ju)(ju)(ju)合物的分(fen)子量,高(gao)于周(zhou)圍(wei)同(tong)種聚(ju)(ju)(ju)合物的分(fen)子量,由(you)于分(fen)子量高(gao),因此晶(jing)(jing)點(dian)(dian)部位(wei)聚(ju)(ju)(ju)合物具(ju)(ju)有(you)較高(gao)熔點(dian)(dian),在(zai)熔化時(shi),熔體具(ju)(ju)有(you)較高(gao)的粘度(du),晶(jing)(jing)點(dian)(dian)部位(wei)聚(ju)(ju)(ju)合物在(zai)吹成(cheng)薄(bo)膜(mo)時(shi),不(bu)能與周(zhou)圍(wei)的同(tong)種聚(ju)(ju)(ju)合物相互均勻(yun)地分(fen)散/混和,并在(zai)熔體吹成(cheng)薄(bo)膜(mo)后(hou),先于周(zhou)圍(wei)的同(tong)種聚(ju)(ju)(ju)合物凝固(gu).因此,研成(cheng)"箭頭"狀或(huo)球狀過度(du)聚(ju)(ju)(ju)合物的凝固(gu)體.習慣上被稱為"晶(jing)(jing)點(dian)(dian)"。
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