什么是"晶點"?
晶(jing)(jing)點(dian)(dian)實際上是"過度聚(ju)合(he)(he)(he)物(wu)".即(ji)晶(jing)(jing)點(dian)(dian)部(bu)位(wei)聚(ju)合(he)(he)(he)物(wu)的分子量,高于周(zhou)圍(wei)同種(zhong)聚(ju)合(he)(he)(he)物(wu)的分子量,由于分子量高,因此晶(jing)(jing)點(dian)(dian)部(bu)位(wei)聚(ju)合(he)(he)(he)物(wu)具(ju)有較(jiao)高熔(rong)(rong)點(dian)(dian),在熔(rong)(rong)化時,熔(rong)(rong)體(ti)具(ju)有較(jiao)高的粘度,晶(jing)(jing)點(dian)(dian)部(bu)位(wei)聚(ju)合(he)(he)(he)物(wu)在吹(chui)成薄膜時,不能與周(zhou)圍(wei)的同種(zhong)聚(ju)合(he)(he)(he)物(wu)相互均勻地(di)分散/混(hun)和,并在熔(rong)(rong)體(ti)吹(chui)成薄膜后,先于周(zhou)圍(wei)的同種(zhong)聚(ju)合(he)(he)(he)物(wu)凝固(gu).因此,研成"箭頭"狀或球狀過度聚(ju)合(he)(he)(he)物(wu)的凝固(gu)體(ti).習慣上被稱(cheng)為"晶(jing)(jing)點(dian)(dian)"。
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