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首页> 外文期刊>Journal of Applied Polymer Science >NOVEL AMPHIPHILIC POLYURETHANE NETWORKS - GELATION MECHANISM AND SWELLING BEHAVIORS
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NOVEL AMPHIPHILIC POLYURETHANE NETWORKS - GELATION MECHANISM AND SWELLING BEHAVIORS

机译：新型两性聚氨酯网络-凝胶机理和溶胀行为。

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摘要

Amphiphilic polyurethane gels can be prepared using poly(ethylene glycol)-modified urethane acrylate (PMUA) through two types of methods. When PMUA gels were prepared at an aqueous phase, droplet coalescence and gelation occurred at the same time, so the microstructure of these gels (UAHG) was similar to that of PMUA emulsion which was formed by the microphase separation between hydrophilic and hydrophobic domains. In the case of UAHG gels, as the composition ratio of water to PMUA increased, swelling in water increased, but swelling in dioxane was slightly decreased. For the other kind of PMUA gels prepared using dioxane through a conventional gelation process (UADG), swelling in dioxane greatly increased with increasing of the composition ratio of dioxane; however, swelling of these gels in water was very low. The difference in swelling behavior between UAHG and UADG gels was due to the difference of microstructures between these gels which also influenced the mechanical properties. Additionally, the microstructures of UADG and UAHG gels were able to be confirmed using scanning electron microscopy (SEM) and contact angle measurement. (C) 1997 John Wiley & Sons, Inc. [References: 18]
机译：两性聚氨酯凝胶可通过两种方法使用聚乙二醇改性氨基甲酸酯丙烯酸酯（PMUA）制备。当在水相中制备PMUA凝胶时，会同时发生液滴聚结和凝胶化，因此这些凝胶（UAHG）的微结构类似于通过亲水和疏水域之间的微相分离而形成的PMUA乳液。对于UAHG凝胶，随着水与PMUA的组成比增加，水中溶胀增加，但在二恶烷中溶胀略有减少。对于使用二恶烷通过常规胶凝工艺（UADG）制备的另一种PMUA凝胶，二恶烷中的溶胀度随二恶烷组成比的增加而大大增加。然而，这些凝胶在水中的溶胀非常低。 UAHG和UADG凝胶之间溶胀行为的差异是由于这些凝胶之间的微观结构不同，这也影响了机械性能。另外，可以使用扫描电子显微镜（SEM）和接触角测量来确认UADG和UAHG凝胶的微观结构。 （C）1997 John Wiley＆Sons，Inc. [参考：18]

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