排序方式: 共有28条查询结果,搜索用时 8 毫秒
1.
2.
3.
4.
5.
高玉香 《武汉理工大学学报(材料科学英文版)》2009,24(4):571-574
A series of cross-linked gels of Poly(N-isopropylacrylamide) [P(NIPAAm)] and Poly(methacr-ylic acid)[P(MAA)] homopolymers
and P(NIPAAm-co-MAA) random copolymers were synthesized based on NIPAAm and MAA using 4,4-Bis-(methacryloylamino) azobenzene
(BMAAB) as a cross-linker. The swelling behavior of these hydrogels in different pH buffer solutions was studied. The influential
factors of the gels including composition of NIPAAm and MAA, pH and temperature upon swelling behavior were investigated.
The obtained gels not only hold pH and thermometrical sensitivity, but also take on enzymatic sensitivity due to the cross-linker
could be degraded by enzymes of colon. Swelling equilibrium degree of copolymers was very low in acidic medium, which could
avoid drug releasing due to biggish swelling of carrier in stomach. Hydrogels would partly swell owing to higher pH value
in small intestine. When arrived in colon, hydrogels completely swelled, meanwhile, azoenzymes located would degrade azo-bonds
of polymeric network and then drug released in colon. 相似文献
6.
7.
机采系统效率是评价机采系统用能水平的重要指标,也是反映采油用能水平的重要指标。提高机采系统效率是油田降本增效的重要途径,本文从地面、地下、管理三个方面系统分析影响机采系统的因素,并提出了提高机采系统效率的对策。 相似文献
8.
9.
高玉香 《中国信息技术教育》2010,(6):50-50
随着科学技术的发展,传统的思维方式、思想观念正受到巨大的冲击.多媒体辅助教学已由优质课、示范课上的"表演"向实施素质教育的主阵地迈进. 相似文献
10.
彩色水泥屋面瓦是一种符合国家环保政策、保护国土资源和生态环境的新型墙体屋面材料.彩色水泥瓦不但具有很好的外观装饰效果,而且还具有抗风、抗冻、防水等性能. 相似文献