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lovedsf

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Originally posted by catzhangzhe at 2011-02-19 13:13:59:
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ymyuming

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taozhikai(½ð±Ò+1): лл 2011-03-20 22:29:15
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lovedsf

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taozhikai(½ð±Ò+1): лл²ÎÓë 2011-03-20 22:29:50
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Originally posted by ymyuming at 2011-03-20 18:46:53:
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Xiang_cai145

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liyangliu

½ð³æ (СÓÐÃûÆø)

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1845114Â¥: Originally posted by catzhangzhe at 2011-02-19 21:13:59
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lovedsf

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1980188Â¥: Originally posted by liyangliu at 2012-10-29 10:05:12
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fuqinglong

½ð³æ (СÓÐÃûÆø)

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A piece of water-wet sample containing about 100 mg
dry cellulose was dried for 2 h at 105 ¡ãC, weighed
accurately, and put into 40 mL of 75% ethanol in a
glass bottle. The bottle, loosely stoppered, was heated
to 50¨C60 ¡ãC for 30 min for better swelling of the material.
Then 40 mL of 0.5 N NaOH solution, accurately
measured, was added to the sample and the
mixture was heated to 50¨C60 ¡ãC for 15 min. Then the
bottle was stoppered tightly and allowed to stand at
room temperature for about 48 h. The excess alkali
was then titrated with 0.5 N HCl using phenolphthalein
as an indicator.
18Â¥2014-10-10 16:00:35
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fuqinglong

½ð³æ (СÓÐÃûÆø)

Surface acetylation of bacterial cellulose     Cellulose 9: 361¨C367, 2002.
19Â¥2014-10-10 16:01:14
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fuqinglong

½ð³æ (СÓÐÃûÆø)

Cellulose 9: 361¨C367, 2002.

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