将三-(二甲胺基甲基)苯酚(K-54)作为表面交联促进剂加入到表面交联液中,对水溶液聚合法制备的高吸水性树脂(SAP)进行表面交联改性,研究了K-54对SAP残留单体含量、吸水倍率、保水性能和加压吸收量(absorbent under load,AUL)的影响,并采...将三-(二甲胺基甲基)苯酚(K-54)作为表面交联促进剂加入到表面交联液中,对水溶液聚合法制备的高吸水性树脂(SAP)进行表面交联改性,研究了K-54对SAP残留单体含量、吸水倍率、保水性能和加压吸收量(absorbent under load,AUL)的影响,并采用红外光谱分析、热失重分析和扫描电镜考察了K-54对SAP热稳定性和表面形貌的影响。研究结果表明,K-54可以促进表面交联反应从而降低丙烯酸残留单体含量,提高自身热稳定性。K-54改性后,降低了SAP吸水倍率和保水能力,但提高了SAP的加压吸收量,更有利于高吸水性树脂的应用。展开更多
Methylenecholestan 3 β,5α,6β triol 1 isolated from the soft coral, Sinularia dissecia has high antifouling property and biodecomposability in natural environment, safe for human bodies. We have synthesized compound...Methylenecholestan 3 β,5α,6β triol 1 isolated from the soft coral, Sinularia dissecia has high antifouling property and biodecomposability in natural environment, safe for human bodies. We have synthesized compound 1 in seven steps starting from stigmasterol 2 in overall yield of 31 3%. The side chain of stigmasterol 2 was modified to keto containing structure of compound 3 via hydroxy group and olefin protection, ozonization, wittig reaction and hydrogenation. The A/B ring was modified by oxidation with performic acid to give stereospecific 5 α,6β diol sterol 4. The compound 1 was then obtained by methylenation of cabonyl group at the 24C of 4 through Wittig reaction in a rather strict conditions. The mp, and NMR data of synthesized 1 were in good agreement with that of the natural compound reported by Masaru . This is the first time of the synthesis of 24 methylenecholest 3 β,5α,6β triol 1.展开更多
The synthesis of an new photochromical compound,1,3,3 trimethyl 6′ (1 piperidinyl) spiro[2h indole 2,3′ [3H]pyridobenzoxazine (SP3),and an improved way for the synthesis of 6 hydroxyquinoline were descrided.The abso...The synthesis of an new photochromical compound,1,3,3 trimethyl 6′ (1 piperidinyl) spiro[2h indole 2,3′ [3H]pyridobenzoxazine (SP3),and an improved way for the synthesis of 6 hydroxyquinoline were descrided.The absorption spectrum of the colored metastable form SP3 shows prominent absorption peak at 560nm at 60℃?展开更多
文摘将三-(二甲胺基甲基)苯酚(K-54)作为表面交联促进剂加入到表面交联液中,对水溶液聚合法制备的高吸水性树脂(SAP)进行表面交联改性,研究了K-54对SAP残留单体含量、吸水倍率、保水性能和加压吸收量(absorbent under load,AUL)的影响,并采用红外光谱分析、热失重分析和扫描电镜考察了K-54对SAP热稳定性和表面形貌的影响。研究结果表明,K-54可以促进表面交联反应从而降低丙烯酸残留单体含量,提高自身热稳定性。K-54改性后,降低了SAP吸水倍率和保水能力,但提高了SAP的加压吸收量,更有利于高吸水性树脂的应用。
文摘Methylenecholestan 3 β,5α,6β triol 1 isolated from the soft coral, Sinularia dissecia has high antifouling property and biodecomposability in natural environment, safe for human bodies. We have synthesized compound 1 in seven steps starting from stigmasterol 2 in overall yield of 31 3%. The side chain of stigmasterol 2 was modified to keto containing structure of compound 3 via hydroxy group and olefin protection, ozonization, wittig reaction and hydrogenation. The A/B ring was modified by oxidation with performic acid to give stereospecific 5 α,6β diol sterol 4. The compound 1 was then obtained by methylenation of cabonyl group at the 24C of 4 through Wittig reaction in a rather strict conditions. The mp, and NMR data of synthesized 1 were in good agreement with that of the natural compound reported by Masaru . This is the first time of the synthesis of 24 methylenecholest 3 β,5α,6β triol 1.
文摘The synthesis of an new photochromical compound,1,3,3 trimethyl 6′ (1 piperidinyl) spiro[2h indole 2,3′ [3H]pyridobenzoxazine (SP3),and an improved way for the synthesis of 6 hydroxyquinoline were descrided.The absorption spectrum of the colored metastable form SP3 shows prominent absorption peak at 560nm at 60℃?
