2007年6月8日舉行了楊貴忠同學的博士學位論文答辯會，答辯委員會主席由同濟大學李新貴教授擔任。楊貴忠同學的博士論文題目為“芴苯聚合物的合成、光物理性能、聚集態結構及相互關系研究”。楊貴忠同學攻讀博士學位期間所發表的代表性論文如下：
(1) G.Z.Yang, X.L.Chen, L.M.Wang, J.G.Shi, C.Z.Li, T.X.Liu*
Synthesis and characterization of fluorene-based rod-coil liquid crystal polymers
Polym. Adv. Technol., 2009, 20(2), 104-110.
(2) G.Z.Yang, W.Z.Wang, M.Wang, T.X.Liu*
Side Chain Effect on the Structural Evolution and Properties of Poly(9,9-dihexylfluorene-alt-2,5-dialkoxybenzene) Copolymers
J. Phys. Chem. B, 2007, 111(27), 7747-7755.
(3) G.Z.Yang, X.L.Chen, T.X.Liu*, C.Z.Li
Nonisothermal crystallization and melting behavior of a luminescent conjugated polymer, poly(9,9-dihexylfluorene-alt-co-2,5-didecyloxy-1,4-phenylene)
J. Polym. Sci. Part B: Polym. Phys., 2007, 45(8), 976-987.
(4) G.Z.Yang, X.L.Chen, Y.Xu, C.Z.Li, P.Y.Wu, T.X.Liu*
Nonisothermal Crystallization Behavior of a Luminescent Conjugated Polymer, Poly(9,9-dihexylfluorene-alt-2,5-didodecyloxybenzene)
Polym. Int.,2007, 56(2), 245-251.
(5) G.Z.Yang, P.Chen, T.X.Liu*, M.Wang, W.Huang
Photophysical Properties and Morphologies of Fluorene-alt-Benzene Based Conjugated Polymers
Polym. Adv. Technol., 2006, 17(7-8), 544-551.
(6) G.Z.Yang, M.Wu, S.Lu, M.Wang, T.X.Liu*, W.Huang
Thermooxidative Stability of Spectra of Fluorene-Based Copolymers
Polymer, 2006, 47(13), 4816-4823.