Ishikawa Nobuhiro, Furutani Masahiro, Arimitsu Koji
Department of Pure and Applied Chemistry, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
ACS Macro Lett. 2015 Jul 21;4(7):741-744. doi: 10.1021/acsmacrolett.5b00359. Epub 2015 Jun 30.
A cross-linking reagent having two adenine units was mixed with polymers bearing thymine units to form adhesive materials utilizing both intermolecular hydrogen bonding and in situ formation of covalent bonds. In the case of 58 mol % of adenine units relative to thymine units, formation of intermolecular hydrogen bonds because of a thymine-adenine interaction was observed at room temperature using FT-IR. The peel strength became weak with heating above 60 °C, indicating breakup of intermolecular bonds between thymine and adenine units. On the other hand, UV-vis spectral measurements showed that heating at 80 °C with 254 nm light irradiation facilitated the photodimerization reaction between thymine units even in the presence of adenine cross-linking reagents. This result was consistent with a large value for the peel strength (6.5 N/10 mm) after the dual treatment, heating at 80 °C with 400 mJ/cm of UV irradiation.
将具有两个腺嘌呤单元的交联剂与带有胸腺嘧啶单元的聚合物混合，以利用分子间氢键和共价键的原位形成来制备粘合材料。在腺嘌呤单元相对于胸腺嘧啶单元为58摩尔％的情况下，使用傅里叶变换红外光谱（FT-IR）在室温下观察到由于胸腺嘧啶-腺嘌呤相互作用而形成的分子间氢键。当加热到60℃以上时，剥离强度变弱，这表明胸腺嘧啶和腺嘌呤单元之间的分子间键断裂。另一方面，紫外-可见光谱测量表明，即使存在腺嘌呤交联剂，在254nm光照射下于80℃加热也促进了胸腺嘧啶单元之间的光二聚反应。该结果与在80℃下用400mJ/cm的紫外线照射进行双重处理后的剥离强度较大值（6.5N/10mm）一致。
