Supramolecular Soft Adhesive Materials
Supramolecular Soft Adhesive Materials
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DOI：
10.1002/adfm.200901903
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发表时间：
2010-06-09
影响因子：
19
通讯作者：
Creton, Costantino
中科院分区：
文献类型：
--
作者：
Courtois, Jeremie;Baroudi, Imane;Creton, Costantino
研究了双脲官能化低分子量聚异丁烯（PIBUT）的流变性能和粘接性能。这些聚合物可以通过超分子氢键相互作用，在室温下可以在几天的时间内自组织。这种有组织的结构已被确定的小角X-射线散射（SAXS）和其流变性能表明的软粘弹性凝胶的行为。有序结构可以被温度和剪切破坏，使得在80摄氏度下，材料表现为高度粘弹性流体，并且没有观察到SAXS峰。当在室温下冷却时，PIBUT在退火20小时后恢复其有序结构和凝胶性质。这种非常缓慢的分子动力学使PIBUT在变形时具有高度耗散的性质，其与强烈相互作用的部分相结合，在钢表面上产生非常有趣的粘合性能，但更重要的是在典型的低粘附表面如硅树脂上。一种策略的基础上控制纳入超分子键的共价交联网络的发展出现了新一代的高度相互作用和耗散的软胶粘剂的前景。
The rheological and adhesive properties of bis-urea functionalized low-molecular-weight polyisobutylenes (PIBUT) are investigated. The polymers, which can interact through supramolecular hydrogen bonds, can self-organize over times of the order of days at room temperature. This organized structure has been identified by small angle X-ray scattering (SAXS) and its rheological properties indicate the behaviour of a soft viscoelastic gel. The ordered structure can be disrupted by temperature and shear so that at 80 degrees C, the material behaves as a highly viscoelastic fluid and no SAXS peak is observed. When cooled back at room temperature, the PIBUT retrieves its ordered structure and gel properties after 20 h of annealing. This very slow molecular dynamics gives PIBUT a highly dissipative nature upon deformation, which combined with strongly interacting moieties results in very interesting adhesive properties both on steel surfaces but more importantly on typical low adhesion surfaces such as silicone. A strategy based on the controlled incorporation of supramolecular bonds in a covalently crosslinked network appears promising for the development of a new generation of highly interacting and dissipative soft adhesives.