Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/18804

Hyperbranched poly(silylenephenylenes) from polycyclotrimerization of A(2)-type diyne monomers: Synthesis, characterization, structural modeling, thermal stability, and fluorescent Patterning

Authors Liu, Jianzhao HKUST affiliated (currently or previously)
Zheng, Ronghua HKUST affiliated (currently or previously)
Tang, Youhong HKUST affiliated (currently or previously)
Haeussler, Matthias HKUST affiliated (currently or previously)
Lam, Jacky Wing Yip View this author's profile
Qin, Anjun HKUST affiliated (currently or previously)
Ye, Mingxin HKUST affiliated (currently or previously)
Hong, Yuning View this author's profile
Gao, Ping View this author's profile
Tang, Ben Zhong View this author's profile
Issue Date 2007
Source Macromolecules , v. 40(21), pp. 7473-7486
Summary A group of hyperbranched poly(silylenephenylenes) (hb-PSPs) were synthesized in high yields (up to 100\%) by TaBr5-catalyzed polycyclotrimerization of A(2)-type monomers of silylenediynes [HC C-C6H4- Si(C(n)H2(n+1))(2)-C6H4-C CH, n = 2, 4, 6]. The hb-PSPs are completely soluble in common organic solvents such as chloroform, toluene, and THE Spectroscopic and modeling studies confirmed that the polymers had formed via a [2 + 2 + 2] cyclotrimerization mechanism. Analysis of the triple-bond conversion processes led to the establishment of a relationship between the degree of branching and the fraction of dendritic unit. Computational simulation shed light on the real topological structures of the hb-PSPs. The polymers lost little weights when heated up to 480 degrees C and carbonize in high yields (up to 71 \%) after pyrolysis at 800 degrees C. The hb-PSPs possess a unique sigma-pi conjugated electronic structure and emit strong violet-blue light upon photoexcitation. The triple bonds on the peripheries allowed the thin films of the polymers to be readily photo-cross-linked, generating fluorescent photoimages in high resolutions.
ISSN 0024-9297
Language English
Format Article
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