以下为句子列表：
英文: Polylactic acid (PLA) of different molecular weights were synthesized by the direct condensation of lactic acid with modified gneiss as the catalyst, or with modified gneiss and stannous caprylate as the catalyst in the same reaction conditions and differ
中文: 摘要以天然矿石－改性片麻岩为聚合反应的催化剂，通过直接缩聚方法制备了不同分子量的聚乳酸。
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