分子量是用GPC法（凝胶渗透色谱法）测定的,仪器是美国PE series 200,PS（聚苯乙烯）作内标.
ps 仪器跟我们的一样 我下午就要去做 哈哈 好巧啊
Molecular weights were measured by GPC using PE series 200 w
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