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更新時間：2025.05.17
熱水管材用乙烯-丙烯無規(guī)共聚樹脂的結構表征

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Two commercial ethylene-propylene random copolymers(A and B) for hot water piping of which A has better long term heat stability and slow crack growth resistance performance than B were fractionated with respect to the isotactity distribution by preparative temperature-rising elution fractionation(TREF).The molecular weight and distribution of fractions and the original resins were investigated by gel permeation chromatography.The results indicated that both A and B had broad isotacticity distribution and A had fewer portions of high isotacticity than B.At the same time A had broader and more typical double-peak molecular weight distribution.The fractions of A had higher molecular weight and broader molecular weight distribution than those of B's.All of these results implied the differences between the catalysts or the polymerization processes for the two copolymers.

PP-R冷熱水管材技術通過鑒定

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由青島化工學院塑料工程技術研究院研究的PP-R冷熱水管材及生產設備技術日前通過山東省科委組織的技術鑒定。 PP-R管是當今世界最先進的供水、供暖管材。

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