ASTM D4671 - 16

    Стандартный метод испытаний полиуретанового сырья: Определение ненасыщенности полиолов

    Active Standard ASTM D4671 Developed by Subcommittee: D20.22

    Book of Standards Volume: 08.02


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    Significance and Use

    5.1 This test method is suitable for quality control, as specification tests, and for research.

    5.2 Side reactions that form unsaturated compounds in polypropylene oxides produce small amounts of polymers with only one hydroxyl group per chain. These unsaturated polymers lower functionality and molecular weight, while broadening the overall molecular-weight distribution.