Formation and destruction of physical crosslinks by mild treatments in chemically crosslinked poly(vinyl alcohol) gels
Formation and destruction of physical crosslinks by mild treatments in chemically crosslinked poly(vinyl alcohol) gels
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DOI：
10.1007/s00289-011-0450-y
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发表时间：
2011-10-01
期刊：
影响因子：
3.2
通讯作者：
Suzuki, Atsushi
中科院分区：
文献类型：
--
作者：
Otsuka, Emiko;Sugiyama, Masaaki;Suzuki, Atsushi
我们报告的形成，破坏和重新形成的微晶在化学PVA凝胶，交联轻微的戊二醛。将其中形成微晶的干燥凝胶在8A ° C下浸入DMSO和水的混合物的不良溶剂中，其中凝胶保持在其塌陷状态。凝胶在加热至50 A ℃时膨胀，但在冷却至8 A ℃时不返回到初始状态。在水中完全洗涤凝胶后，干燥过程导致微晶重新形成，并且凝胶可以在8A摄氏度下恢复到初始干燥状态。通过XRD和FT-IR测试，得出结论：化学交联PVA凝胶中微晶的形成和破坏可以通过初始干燥、温度变化和洗涤干燥等温和处理来控制。
We report the formation, destruction, and re-formation of the microcrystallites in a chemical PVA gel, crosslinked slightly by glutaraldehyde. The dried gel, in which the microcrystallites were formed, was immersed in a poor solvent of a mixture of DMSO and water at 8 A degrees C, where the gel stayed in its collapsed state. The gels swelled on heating to 50 A degrees C, but did not return to the initial state on cooling to 8 A degrees C. After washing the gel completely in water, a drying process caused the microcrystallites to be re-formed and the gel could return to the initial dried state at 8 A degrees C. By using XRD and FT-IR measurements, it was concluded that the formation and destruction of microcrystallites in chemically crosslinked PVA gels could be controlled by the mild treatments of initial drying, temperature change, and washing and drying.