Contrast viscosity changes upon photoirradiation for mixtures of poly(acrylic acid)-based α-cyclodextrin and azobenzene polymers
Contrast viscosity changes upon photoirradiation for mixtures of poly(acrylic acid)-based α-cyclodextrin and azobenzene polymers
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DOI：
10.1021/ja058345a
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发表时间：
2006-02-22
影响因子：
15
通讯作者：
Harada, A
中科院分区：
文献类型：
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作者：
Tomatsu, I;Hashidzume, A;Harada, A
采用粘度法和核磁共振法研究了聚丙烯酸（pAA）偶氮苯（pC 12 Azo）和两种pAA α-环糊精（CD）的混合物的聚合物-聚合物相互作用，其中CD分别通过CD的3位和6位连接到主链上（p3αCD和p6αCD）。粘度数据显示UV照射后的对比度变化：变稀（p3αCD/pC 12 Azo）和变稠（p6αCD/pC 12 Azo）。NOESY光谱证实，反式异构化偶氮苯后，CD与pC 12 Azo的相互作用方式不同，形成了包合物（p3αCD/pC 12 Azo）和互锁复合物（p6αCD/pC 12 Azo）。
Polymer−polymer interactions were investigated for mixtures of a poly(acrylic acid) (pAA) carrying azobenzene (pC12Azo) and two kinds of pAA carrying α-cyclodextrin (CD), in which CDs are attached to the main chain through the 3- and 6-positions in CD (p3αCD and p6αCD, respectively), using several techniques, such as viscosity and NMR measurements. Viscosity data exhibited contrast changes upon UV irradiation: thinning (p3αCD/pC12Azo) and thickening (p6αCD/pC12Azo). NOESY spectra confirmed that the contrast viscosity changes were ascribable to differences in how CD moieties interact with pC12Azo after photoisomerization of azobenzene moieties fromtranstocis: dissociation of inclusion complexes (p3αCD/pC12Azo) and formation of interlocked complexes (p6αCD/pC12Azo).