立静致远
第4楼2007/10/18
聚烷撑二醇
聚亚烷基氧化物
[/quote]
是两类化合物，有什么不同，从名字上就能看出来[/quote]
可是从结构上来说，都是聚醚的结构是吧？那Polyethylene glycol和Polyethylene oxide不同之处在哪里呢？[/quote]
Polyehylene Glycol is an addition polymer of ethylene oxide and water,represented by the formula:
H(OCH2CH2)nOH
in which n represents the average number of oxyethylene groups. The average molecular weight is not less than 95.0 percent and not more than 105.0 percent of the labeled nominal value if the labeled nominal value is below 1000; it is not less than 90.0 percent and not more than 110.0 percent of the labeled nominal value if the labeled nominal value is between 1000 and 7000; it is not less than 87.5 percent and not more than 112.5 percent of the labeled nominal value if the labeled nominal value is above 7000.It may contain a suitable antioxidant.
立静致远
第5楼2007/10/18
Polyethylene Oxide is a nonionic homopolymer of ethylene oxide,represented by the formula:
(OCH2CH2)n
in which n represents the average number of oxyethylene groups.It is a white to off-white powder abtainable in several grades,varying in viscosity profile in an aqueous isopropyl alcohol solution. It may contain a suitable antioxidant.
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