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A comparison of the results with those found after extraction of an unprocessed PVC/sorbitol (1.0 phr) mixture that was also thermally degraded for 2.5 h at 200 _C (vide supra) reveals that roll-mill processing enhances the conversion of sorbitol into its intramolecular cyclodehydrationproducts (ground-processed 40% vs. unprocessed 14%). In combination with the significant reductionof DHC rate this points to a relationship between intramolecular cyclodehydration and the propensity of the added polyol to exert long-term heat stabilisation via HCl scavenging. ÓÈÆäÊÇground-processed £¬ÎÒ·Òë²»³öÀ´£¬Çë´óϺÃǰï°ïæ¡£ |
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first, "ground-processed"="roll-mill proceessed"
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jingjiniao(½ð±Ò+2):лл²ÎÓë
jingjiniao(½ð±Ò+2,VIP+0):ллÄúµÄ°ï棬·Ç³£¸Ðл 10-14 13:57
zap65535(½ð±Ò+2,VIP+0):²¹·¢ 12-22 11:10
jingjiniao(½ð±Ò+2):лл²ÎÓë
jingjiniao(½ð±Ò+2,VIP+0):ллÄúµÄ°ï棬·Ç³£¸Ðл 10-14 13:57
zap65535(½ð±Ò+2,VIP+0):²¹·¢ 12-22 11:10
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¹öѹÄëËé´¦Àí¡£ ͨ¹ýºÍû×ö¹öѹÄëËé´¦Àí, Ö»ÔÚ200¶È×ö¹ý2.5СʱÈȽµ½âµÄPVC/sorbitol»ìºÏÎïÌáÈ¡ºóµÄ½á¹ûÏà±È½Ï, ±íÃ÷¹öѹÄëËé´¦ÀíÌá¸ßÁËsorbitolÏò its intramolecular cyclodehydrationproductsµÄת»¯. (¹öѹÄëËé´¦Àí 40% ¶Ô ·Ç¹öѹÄëËé´¦Àí 14%) ½áºÏ¼«´óµØ½µµÍÁËDHC²úÂÊ,ÉÏÃæËùÊöÊÂʵָ³öÁËintramolecular cyclodehydrationºÍΪÌá¸ß³¤ÆÚÈÈÎȶ¨¶ø²ô¼Ó polyollÓÃÒÔÈ¥³ýHClÒÔµÄÇ÷ÊÆÖ®¼äµÄ¹ØÏµ. |
2Â¥2009-10-13 15:23:33
lixiaod001
½ð³æ (ÕýʽдÊÖ)
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3Â¥2009-10-13 16:34:04














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