Zhong Ling, Jiao Tifeng, Liu Minghua
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
J Phys Chem B. 2009 Jul 2;113(26):8867-71. doi: 10.1021/jp902822q.
In this paper, we have investigated the photopolymerization of an amphiphilic diacetylene, 10,12-pentacosadiynoic acid (PCDA), in organized molecular films in the presence of a series of gemini amphiphiles with different spacer lengths. It has been found that, when gemini amphiphiles were mixed with the diacetylene, the film-forming properties were greatly improved and the photopolymerization could be regulated by the gemini amphiphiles. Miscibility and Fourier transform infrared spectroscopy (FT-IR) investigations revealed that the polymerization of PCDA in a mixed film was regulated by the mixing ratio and spacer length of the gemini amphiphiles. Although a slight amount of gemini amphiphile did not make the PCDA polymerize into blue films, the increment of the gemini amphiphile with the short spacer length in the mixed film caused the formation of a red film, and the intensity of red phase to blue phase can be modulated by changing the mixing ratios. When gemini amphiphiles with longer spacer lengths were mixed, blue films were predominantly obtained in all mixing ratios. A mechanism including the interaction between the headgroup of the gemini amphiphiles and the diacetylene and the regulation of the spacer was proposed.
在本文中，我们研究了在一系列具有不同间隔长度的双子表面活性剂存在下，两亲性二乙炔10,12-二十五碳二炔酸（PCDA）在有序分子膜中的光聚合反应。研究发现，当双子表面活性剂与二乙炔混合时，成膜性能得到显著改善，且光聚合反应可由双子表面活性剂调控。混溶性和傅里叶变换红外光谱（FT-IR）研究表明，PCDA在混合膜中的聚合反应受双子表面活性剂的混合比例和间隔长度的调控。虽然少量的双子表面活性剂不会使PCDA聚合成蓝色薄膜，但混合膜中短间隔长度的双子表面活性剂的增加会导致形成红色薄膜，并且通过改变混合比例可以调节红相到蓝相的强度。当混合长间隔长度的双子表面活性剂时，在所有混合比例下主要得到蓝色薄膜。提出了一种包括双子表面活性剂头基与二乙炔之间的相互作用以及间隔调控的机制。
