Bogris A, Wang J, Anyfantakis M, Loppinet B, Craig S L, Butt H-J, Fytas G
Institute of Electronic Structure and Laser , Foundation for Research and Technology - Hellas , 70013 Heraklion , Crete , Greece.
Department of Materials Science and Technology , University of Crete , 70013 Heraklion , Crete , Greece.
J Phys Chem B. 2018 Jul 12;122(27):6995-7001. doi: 10.1021/acs.jpcb.8b02463. Epub 2018 Jun 27.
The formation of permanent structures upon mild red laser illumination in transparent polydiene solutions is examined in the case of gem-dichlorocyclopropanated polybutadiene ( gDCC-PB) polymers bearing 15% functional units of the dichlorocyclopropane groups. The response was found to be distinct from the precursor PB. Whereas fiber-like patterns were clearly observed in both precursor and gDCC-PB solutions in cyclohexane, these were absent in the case of gDCC-PB/chloroform but were present in the precursor PB/chloroform solutions. The involved mechanical stresses were not sufficient for the gDCC activation to be detected by NMR spectroscopy. Remarkably, addition of even 10 wt % gDCC-PB into the latter solution sufficed to suppress the light-induced patterning. The importance of the chemical environment on the response to light irradiation was further checked and confirmed by use of other PB copolymers. Different diameter patterns and kinetics were observed. The strong solvent and comonomer mediated effect was reflected neither in solvency nor in optical polarizability differences of the polymers solvent couples.
在含有15%二氯环丙烷基团功能单元的偕二氯环丙烷化聚丁二烯（gDCC-PB）聚合物的情况下，研究了在透明聚二烯溶液中经温和红色激光照射后永久结构的形成。发现该响应与前体聚丁二烯（PB）不同。虽然在环己烷中的前体和gDCC-PB溶液中都能清楚地观察到纤维状图案，但在gDCC-PB/氯仿溶液中没有这些图案，而在前体PB/氯仿溶液中则存在。所涉及的机械应力不足以通过核磁共振光谱检测到gDCC的活化。值得注意的是，即使在后者溶液中加入10 wt%的gDCC-PB也足以抑制光诱导图案化。通过使用其他PB共聚物进一步检查并证实了化学环境对光照射响应的重要性。观察到了不同直径的图案和动力学。聚合物-溶剂对的溶解能力和光学极化率差异均未反映出强溶剂和共聚单体介导的效应。
