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chenluyi0502

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6Â¥: Originally posted by hummerrr at 2013-01-13 21:14:04
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chenluyi0502

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13Â¥: Originally posted by aircraftvip at 2013-01-14 04:49:32
ÄãÄܰÑÄã²ÎÕÕµÄÔ­ÎÄÏ×µÄÁ´½Ó·¢¹ýÀ´Âð...

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chenluyi0502: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2013-01-14 23:37:37
»ÆÍª: ½ð±Ò+1, »¶Ó­À´ÉúÎï²ÄÁÏ»ØÌû½»Á÷ 2013-01-15 09:35:13
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14Â¥: Originally posted by ºìÖÛÁ÷ÐÇ at 2013-01-14 10:32:29
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Unfortunately, real time-FTIR or Photo-DSC are only applicable to samples that do not contain water.

To monitor the curing-kinetics of hydrogels, in-situ photo-rhelogy is the most promising technique in which the principle is gel's elastic modulus depends on the crosslinking density.  Photo-rheometry enables the real-time measurement of both G' and G'' (storage and loss modulus) of the sample. From the curve, you could see when the gel reaches a G' plateau, thus you know whether the curing is done.  In addition, gel point could be easily induced  from the plotted curves.  

Since hydrogels' mechanical properties largely depends on the water content, you'd better not dry your hydrogel out and use this as a sign for full-conversion.

To get general approaches on how to measure hydrogels' mechanical properties, here is a very good review:   
Kloxin, A. M.; Kloxin, C. J.; Bowman, C. N.; Anseth, K. S., Mechanical Properties of Cellularly Responsive Hydrogels and Their Experimental Determination. Advanced Materials 2010, 22, (31), 3484-3494.
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16Â¥2013-01-14 20:20:42
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aircraftvip

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15Â¥: Originally posted by chenluyi0502 at 2013-01-14 14:13:55
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O.K.
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17Â¥2013-01-14 20:25:56
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aircraftvip

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ºìÖÛÁ÷ÐÇ: ½ð±Ò+2, Ó¦ÖúÖ¸Êý+1, ר¼Ò¿¼ºË, »¶Ó­À´µ½ÉúÎ﹦ÄܲÄÁϰå¿é»ý¼«Ó¦Öú½»Á÷ 2013-01-15 00:20:51
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17Â¥: Originally posted by aircraftvip at 2013-01-14 20:25:56
O.K....

The original article is this one where detailed information included:
Gong, J. P.; Kurokawa, T.; Narita, T.; Kagata, G.; Osada, Y.; Nishimura, G.; Kinjo, M., Synthesis of hydrogels with extremely low surface friction. J Am Chem Soc 2001, 123, (23), 5582-3.
......The poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) gel was synthesized by the radical polymerization. An aqueous solution of 1.0 M 2-acrylamido-2-methyl-1-propanesulfonic
acid (AMPS), 5.0 mol % cross-linking agent, N,N¡é-methylenebisacrylamide(MBAA), and 0.1 mol % initiator, 2-oxoglutaric acid, in the reaction cell was purged with nitrogen gas for 30-45 min and was irradiated with UV light Sample Text. The reaction was carried out between a pair of polystyrene substrates or glass substrates, separated with a spacer 2 mm thick. After polymerization, the gel was immersed in a large amount of water for 1 week to equilibrate and to wash away the residual chemicals. ......

Without UV wavelength specification, the irradiation time was 5 h long in this paper, which seems unusual.
But in your case, you could try to increase the time to 30 min, for each side (top and bottom of the sample)
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18Â¥2013-01-14 22:37:27
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aircraftvip

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ºìÖÛÁ÷ÐÇ: ±à¼­ÄÚÈÝ 2013-01-14 23:13
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[ Last edited by ºìÖÛÁ÷ÐÇ on 2013-1-14 at 23:13 ]
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19Â¥2013-01-14 22:38:23
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aircraftvip

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»ÆÍª: ½ð±Ò+1, ר¼Ò¿¼ºË£¬»¶Ó­À´ÉúÎï²ÄÁÏÓ¦Öú 2013-01-15 09:36:09
ÒýÓûØÌû:
19Â¥: Originally posted by aircraftvip at 2013-01-14 22:38:23
The original article is this one where detailed information included:

Gong, J. P.; Kurokawa, T.; Narita, T.; Kagata, G.; Osada, Y.; Nishimura, G.; Kinjo, M., Synthesis of hydrogels with extremel ...

Sample Text = for 5 h at 25 ¡ãC

Sample Text= You could try to increase your exposure time to 30 min at least, for both sides (top and bottom)
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20Â¥2013-01-14 22:40:58
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