什么是"晶點(dian)"?
晶點(dian)實際上是"過度聚(ju)(ju)合物(wu)(wu)(wu)".即晶點(dian)部位聚(ju)(ju)合物(wu)(wu)(wu)的分(fen)子量(liang),高于(yu)周(zhou)(zhou)圍(wei)同(tong)種(zhong)聚(ju)(ju)合物(wu)(wu)(wu)的分(fen)子量(liang),由于(yu)分(fen)子量(liang)高,因此晶點(dian)部位聚(ju)(ju)合物(wu)(wu)(wu)具有較高熔(rong)點(dian),在(zai)熔(rong)化時(shi),熔(rong)體具有較高的粘度,晶點(dian)部位聚(ju)(ju)合物(wu)(wu)(wu)在(zai)吹成薄膜(mo)時(shi),不能與(yu)周(zhou)(zhou)圍(wei)的同(tong)種(zhong)聚(ju)(ju)合物(wu)(wu)(wu)相互(hu)均勻地分(fen)散/混和,并(bing)在(zai)熔(rong)體吹成薄膜(mo)后,先于(yu)周(zhou)(zhou)圍(wei)的同(tong)種(zhong)聚(ju)(ju)合物(wu)(wu)(wu)凝(ning)固.因此,研成"箭頭"狀或球狀過度聚(ju)(ju)合物(wu)(wu)(wu)的凝(ning)固體.習(xi)慣上被稱為"晶點(dian)"。
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