±±¾©Ê¯ÓÍ»¯¹¤Ñ§Ôº2026ÄêÑо¿ÉúÕÐÉú½ÓÊÕµ÷¼Á¹«¸æ
²é¿´: 732  |  »Ø¸´: 4
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

qq5391297

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)


[½»Á÷] Çó·­ÒëÒ»¶ÎÓ¢ÎÄ

Two series of N-methylaniline-blocked isocyanates based on monomeric diisocyanates such as 4,4¡ä-methylene bis(phenyl isocyanate), toluene-2,4-diisocyanate, isophorone diisocyanate and 1,6-diisocyanato hexane and their NCO terminated polyurethane prepolymer (polyisocyanates) were prepared and characterized thoroughly by FTIR, 1H NMR, 13C NMR and EI-Mass spectroscopic methods. The blocking reaction of N-methylaniline with aromatic isocyanates and aromatic polyisocyanates occur faster when compared to the aliphatic isocyanates. The deblocking reactions of blocked isocyanates were carried out under dynamic and isothermal conditions using hot-stage FTIR spectrophotometer. The dynamic method was used to determine the deblocking temperature, and the isothermal method was used to calculate kinetics and thermodynamics parameters. Cure reactions of blocked isocyanates with hydroxyl-terminated polybutadiene were also followed to establish the structure¨Cproperty relationship of the N-methylaniline-blocked isocyanates. The deblocking studies of blocked isocyanates reveal that the aromatic isocyanates undergo deblocking easily compared to aliphatic isocyanates. The rate of deblocking reaction of N-methylaniline-blocked aromatic polyisocyanates was found to be higher compared to N-methylaniline-blocked aromatic monomeric diisocyanate adducts. On the other hand, this trend was just reverse in the cure-reaction studies. The dissolution behavior of N-methylaniline-blocked isocyanates in Terathane-2000, polypropylene glycol-2000, polycaprolactone diol-2000 and hydroxyl-terminated polybutadiene-2500 was also studied and found that all adducts are soluble in these polyols.

» ²ÂÄãϲ»¶

» ÇÀ½ð±ÒÀ²£¡»ØÌû¾Í¿ÉÒԵõ½:

²é¿´È«²¿É¢½ðÌù

ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

yuwang86

ľ³æ (ÖøÃûдÊÖ)


Õâ¸ö·­Ò뻹ÊÇ¿ÉÒÔµÄ
4Â¥2011-03-24 10:07:35
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 5 ¸ö»Ø´ð

568995231

гæ (ÖøÃûдÊÖ)


¡ï ¡ï ¡ï ¡ï ¡ï
ringzhu(½ð±Ò-5): ±¾°æÑϽû»úÆ÷·­Ò룡 2011-04-02 12:05:50
Á½ÖÖϵÁÐN-methylaniline-blocked monomericÒìÇèËáõ¥µÈµÄ»ù´¡ÉÏ,diisocyanates 4¡ä-methyleneËı½»ùÒìÇèËáõ¥),¹ú¼ÊÇåËãÒøÐÐ(4-diisocyanate toluene-2,isophorone,6-diisocyanato¶þÒìÇèËáõ¥ºÍ1 /»·¼ºÍéºÍËûÃÇ,polyisocyanates¾Û°±õ¥Ô¤¾ÛÎï(±øÖÖ)ÖÕÖ¹ÓÐ×¼±¸,²¢²ÉÓúìÍâ¹âÆ×±íÕ÷³¹µ×¡¢ºË´Å¹²ÕñÇâÆ×¡¢Ì¼Æ×ºÍEI-Mass¹âÆ×·½·¨¡£N-methylaniline×è¶ÏÓëÒìÇèËáõ¥·´Ó¦,·¼ÏãµÄpolyisocyanates·¼ÏãµÄËÙ¶È·¢Éú,Ïà±ÈÓÚÖ¬·¾×åÒìÇèËáõ¥¡£ÒìÇèËáõ¥µÄ·´Ó¦ÊÜ×èµÄÈ¥½øÐÐÁ˵ÈÎÂÌõ¼þÏµĶ¯Ì¬,ÀûÓøµÀïÒ¶±ä»»ºìÍâ¹âÆ×hot-stage·Ö¹â¹â¶È¼Æ¡£¶¯Ì¬µÄ·½·¨±»ÓÃÀ´È·¶¨È¥Î¶ȡ¢µÈη¨¼ÆË㶯Á¦Ñ§ºÍÈÈÁ¦Ñ§²ÎÊý¡£ÒìÇèËáõ¥Óë×è°­µÄÖÎÁÆ·´Ó¦ÕªÒªp...




½ö¹©²Î¿¼
2Â¥2011-03-23 22:27:12
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

qq5391297

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)


ÒýÓûØÌû:
Originally posted by 568995231 at 2011-03-23 22:27:12:
Á½ÖÖϵÁÐN-methylaniline-blocked monomericÒìÇèËáõ¥µÈµÄ»ù´¡ÉÏ,diisocyanates 4¡ä-methyleneËı½»ùÒìÇèËáõ¥),¹ú¼ÊÇåËãÒøÐÐ(4-diisocyanate toluene-2,isophorone,6-diisocyanato¶þÒìÇèËáõ¥ºÍ1 /»·¼ºÍéºÍËûÃÇ,pol ...

°ÝÍÐÄܲ»Äܲ»·¢°Ù¶ÈµÄ·­Òë°¡¡£¡£¡£×¨ÒµµãÈö
3Â¥2011-03-24 09:32:36
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

qq5391297

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)


ÒýÓûØÌû:
Originally posted by yuwang86 at 2011-03-24 10:07:35:
Õâ¸ö·­Ò뻹ÊÇ¿ÉÒÔµÄ

¿ÉÒÔ£¿£¿ÎÒÔΡ£¡£¡£Õâ·­ÒëÒ²½Ð¿ÉÒÔ£¿£¿
5Â¥2011-03-24 10:51:35
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 346Çóµ÷¼Á Ò»Ö¾Ô¸070303Óлú»¯Ñ§ +4 Âܲ·ìÀÇà²Ë 2026-03-28 4/200 2026-03-30 13:42 by Iveryant
[¿¼ÑÐ] 0703»¯Ñ§/290Çóµ÷¼Á/±¾¿Æ¾­Àú·á¸»/¹¤¿ÆÒ²¿É +13 µ¤ÇàÄÌ¸Ç 2026-03-26 15/750 2026-03-30 12:35 by fangnagu
[¿¼ÑÐ] ²ÄÁÏר˶ 085600Çóµ÷¼Á +5 BBQ233 2026-03-30 5/250 2026-03-30 12:15 by ѧԱ8dgXkO
[¿¼ÑÐ] Çó»¯Ñ§µ÷¼Á +11 wulanna 2026-03-28 11/550 2026-03-30 10:59 by ̽123
[¿¼ÑÐ] 295Çóµ÷¼Á +5 wei-5 2026-03-26 5/250 2026-03-30 08:34 by ̽123
[¿¼ÑÐ] Çóµ÷¼Á +6 ¼Ò¼Ñ¼Ñ¼Ñ¼Ñ¼Ñ 2026-03-29 6/300 2026-03-30 06:48 by zhyzzh
[¿¼ÑÐ] 327Çóµ÷¼Á +4 С¿¨²»¿¨. 2026-03-29 4/200 2026-03-30 06:15 by wxiongid
[¿¼ÑÐ] 329Çóµ÷¼Á +10 Å¥¶÷Ñ© 2026-03-25 10/500 2026-03-29 13:32 by peike
[¿¼ÑÐ] 356Çóµ÷¼Á +4 gysy?s?a 2026-03-28 4/200 2026-03-29 10:32 by ÌÆãå¶ù
[¿¼ÑÐ] ²ÄÁÏѧ˶333Çóµ÷¼Á +11 ±±µÀÏï 2026-03-24 11/550 2026-03-29 08:31 by fmesaito
[¿¼ÑÐ] 356Çóµ÷¼Á +3 gysy?s?a 2026-03-28 3/150 2026-03-29 00:33 by 544594351
[¿¼ÑÐ] 081200-314 +3 LILIQQ 2026-03-27 4/200 2026-03-28 09:41 by ±£»¤µØÇòÄãÎÒ×öÆ
[¿¼ÑÐ] 086502»¯Ñ§¹¤³Ì342Çóµ÷¼Á +6 °¢Ò̸´¹Å²»¹ý 2026-03-27 6/300 2026-03-28 07:06 by wangy0907
[¿¼ÑÐ] 265Çóµ÷¼Á11408 +3 ÁõС¹lu 2026-03-27 3/150 2026-03-27 20:53 by nihaoar
[¿¼ÑÐ] 272Çóµ÷¼Á +7 ½Å»¬µÄÊØ·¨¹«Ãñ 2026-03-27 7/350 2026-03-27 17:23 by laoshidan
[¿¼ÑÐ] ²ÄÁÏÇóµ÷¼Á +5 .m.. 2026-03-25 5/250 2026-03-27 11:08 by ²»³Ôô~µÄ؈
[¿¼ÑÐ] 347Çóµ÷¼Á +4 L when 2026-03-25 4/200 2026-03-25 13:37 by cocolv
[¿¼ÑÐ] 0854È˹¤ÖÇÄÜ·½ÏòÕÐÊÕµ÷¼Á +4 ÕÂСÓã567 2026-03-24 4/200 2026-03-25 13:29 by 2177681040
[¿¼ÑÐ] ²ÄÁϵ÷¼Á +3 iwinso 2026-03-23 3/150 2026-03-25 11:29 by greychen00
[¿¼ÑÐ] 340Çóµ÷¼Á +5 »°Ã·ÌÇ111 2026-03-24 5/250 2026-03-25 06:53 by ilovexiaobin
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û