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ostrich1853
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
ÔÓ»õÆÌ
- Ó¦Öú: 42 (СѧÉú)
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- Ìû×Ó: 1245
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2Â¥2012-05-14 15:25:34
slcoco
гæ (³õÈëÎÄ̳)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 101.8
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- ³æºÅ: 1728769
- ×¢²á: 2012-03-31
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§
3Â¥2012-05-14 16:31:54
ostrich1853
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
ÔÓ»õÆÌ
- Ó¦Öú: 42 (СѧÉú)
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- ³æºÅ: 694327
- ×¢²á: 2009-01-19
- ÐÔ±ð: GG
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§

4Â¥2012-05-14 16:56:00
slcoco
гæ (³õÈëÎÄ̳)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
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5Â¥2012-05-14 17:09:03
ostrich1853
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
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- Ó¦Öú: 42 (СѧÉú)
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¡¾´ð°¸¡¿Ó¦Öú»ØÌû
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Synthesis of a-Propargyl, x-Acetyl Terminated PCL The a-propargyl terminated PCL was prepared by ROP of CL in toluene with Sn(Oct)2 as a catalyst and propargyl alcohol as an initiator. CL (2.85 g, 25 mmol), propargyl alcohol (0.056 g, 1.0 mmol), Sn(Oct)2 (0.05 g, 0.125 mmol), and 30 mL of toluene were added into a glass tube. The mixture in the tube was degassed by three freeze-vacuumthaw cycles. The flask was then placed in an oil bath thermostated at 110 C for 24 h. After the polymerization, the polymer solution was cooled to room temperature and added into an excess of methanol. The precipitate was filtered off and dried at room temperature in a vacuum oven for 48 h. The resultant (CHBCCH2)PCL(OH) was dissolved in chloroform (2.0%, w/v) and then react with acetic anhydride (1.0%, v/v in chloroform) at room temperature for 24 h. The polymer formed was precipitated in methanol and then collected by filtration. After drying at room temperature in a vacuum oven for 48 h, the a-propargyl, x-acetyl terminated PCL, (CHBCCH2)PCL(OOCCH3) were obtained in 88% yield. 1H NMR (300 MHz, CDCl3), d (TMS, ppm): 4.67 (CHBCCH2OOC), 4.06 (CH2CH2CH2CH2 CH2OOC), 2.47 (CHBCCH2OOC), 2.30 (C(O) CH2CH2CH2), 2.02 (OOCCH3), 1.60 (CH2CH2CH2 CH2CH2), 1.32 (CH2CH2CH2CH2CH2). Mn(GPC) ¼ 3740; Mw/Mn ¼ 1.20. IR (KBr, cm1): 3438, 3269, 2946, 2859, 2123, 1733, 1645, 1468, 1419, 1374, 1299, 1249, 1192, 1108, 1047, 965,725. |

6Â¥2012-05-14 17:16:42
ostrich1853
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
ÔÓ»õÆÌ
- Ó¦Öú: 42 (СѧÉú)
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- ÔÚÏß: 441.4Сʱ
- ³æºÅ: 694327
- ×¢²á: 2009-01-19
- ÐÔ±ð: GG
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§

7Â¥2012-05-14 17:18:36
slcoco
гæ (³õÈëÎÄ̳)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 101.8
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- ×¢²á: 2012-03-31
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8Â¥2012-05-15 16:17:00














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