什么是"晶點"?
晶(jing)(jing)點(dian)(dian)(dian)(dian)實(shi)際上是"過度(du)聚合(he)(he)物".即晶(jing)(jing)點(dian)(dian)(dian)(dian)部(bu)位(wei)(wei)聚合(he)(he)物的(de)分(fen)子(zi)量(liang)，高(gao)于(yu)(yu)周(zhou)圍同(tong)種聚合(he)(he)物的(de)分(fen)子(zi)量(liang)，由(you)于(yu)(yu)分(fen)子(zi)量(liang)高(gao)，因(yin)此(ci)晶(jing)(jing)點(dian)(dian)(dian)(dian)部(bu)位(wei)(wei)聚合(he)(he)物具有較(jiao)高(gao)熔點(dian)(dian)(dian)(dian)，在(zai)熔化(hua)時，熔體(ti)(ti)具有較(jiao)高(gao)的(de)粘度(du)，晶(jing)(jing)點(dian)(dian)(dian)(dian)部(bu)位(wei)(wei)聚合(he)(he)物在(zai)吹成薄膜時，不(bu)能與周(zhou)圍的(de)同(tong)種聚合(he)(he)物相互均勻(yun)地分(fen)散/混和(he)，并(bing)在(zai)熔體(ti)(ti)吹成薄膜后(hou)，先于(yu)(yu)周(zhou)圍的(de)同(tong)種聚合(he)(he)物凝(ning)固.因(yin)此(ci)，研成"箭(jian)頭"狀或球狀過度(du)聚合(he)(he)物的(de)凝(ning)固體(ti)(ti).習慣(guan)上被稱為"晶(jing)(jing)點(dian)(dian)(dian)(dian)"。