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For HEC, the HEC dosage of 5g, etherification agent is 7.5g, alkali 1.85g, at 65 ¡æ for 2 hours, the optimal degree of substitution obtained QHEC 0.61, the reaction efficiency was 64%; for the PVA, the PVA concentration of 5%, etherification agent is 7g, alkali 2.5g, at 65 ¡æ for 6 hours, get QPVA optimal degree of substitution 3.95.

[ Last edited by mlnjut on 2011-5-27 at 20:12 ]

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Mally89: ¹û¶ÏÒªµ­¶¨°¡~~~~~~ 2011-05-27 19:40:54
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Mally89(½ð±Ò+1): ¸ÐлӦÖú£¡~»¶Ó­³£À´£¡~ 2011-05-27 19:41:15
PVA and HEC are water-soluble. We used 3-chloro-2-hydroxypropyl trimethyl ammonium chloride as etherifying agent to introduce quaternary ammonium groups into the structure of PVA and HEC through quaternization reaction to prouduce quaternized QPVA and QHEC, respectively.
The effect of reaction conditions on the degree of substitution and reaction efficiency were studied.
For HEC, the HEC dosage of 5g, etherification agent is 7.5g, alkali 1.85g, at 65 ¡æ for 2 hours, the optimal degree of substitution obtained QHEC 0.61, the reaction efficiency was 64%.(Õâ¾ä»°Ã»ÓÐνÓºÃºÃ¸Ä¸Ä~
for the PVA, the PVA concentration of 5%, etherification agent is 7g, alkali 2.5g, at 65 ¡æ for 6 hours, get QPVA optimal degree of substitution 3.95.
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3Â¥2011-05-27 16:22:46
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Originally posted by jacy_cheyn at 2011-05-27 16:22:46:
PVA and HEC are water-soluble. We used 3-chloro-2-hydroxypropyl trimethyl ammonium chloride as etherifying agent to introduce quaternary ammonium groups into the structure of PVA and HEC through qu ...

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me471084707

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Originally posted by jacy_cheyn at 2011-05-27 16:22:46:
PVA and HEC are water-soluble. We used 3-chloro-2-hydroxypropyl trimethyl ammonium chloride as etherifying agent to introduce quaternary ammonium groups into the structure of PVA and HEC through qu ...

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Originally posted by a349857460 at 2011-05-27 17:17:04:
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mlnjut(½ð±Ò+4): ¿ÉÒԵġ£¡£ºÙºÙ 2011-05-27 20:43:49
mlnjut(½ð±Ò+6): 2011-05-28 08:15:58
the optimal degree of substitution obtained QHEC 0.61, the reaction efficiency was 64%¿ÉÒÔ×öÖ÷¾ä£¬
For HEC, the HEC dosage of 5g, etherification agent is 7.5g, alkali 1.85g, at 65 ¡æ for 2 hours,Óá°when.....¡±
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8Â¥2011-05-27 19:54:41
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jacy_cheyn

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mlnjut(½ð±Ò+30, ·­ÒëEPI+1): ºÜºÃµÄŶ¡£¡£Ð»Ð»£¬ÄãµÄÍ·ÏñºÜƯÁÁ¡£¡£ 2011-05-27 20:30:38
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Originally posted by mlnjut at 2011-05-27 16:28:40:
ÄÇÔõô¸ÄÄØ£¿£¿ÎÒ·Ö²»Çå¡£¡£¡£¡£¡£

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HEC, etherification agent and alkali were added in to the reaction with the amounts of which were 5g, 7.5g and 1.85g respectively. The reaction will last 2 hours at the temperature of 65 ¡æ, and the optimal degree of substitution will be up to 0.61 with the reaction efficiency of 64%.

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9Â¥2011-05-27 20:23:22
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sltmac(½ð±Ò+1): BB½±Àø 2011-05-28 00:41:06
mlnjut(½ð±Ò+10): 2011-05-28 08:16:03
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HEC, etherification agent and alkali were added in to the reaction with the amounts of 5g, 7.5g and 1.85g respectively. The reaction will last 2 hours at the temperature of 65 ¡æ, and the optimal degree of substitution will be up to 0.61 with the reaction efficiency of 64%.
10Â¥2011-05-27 20:24:47
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