S
Stephen Z. D. Cheng
Researcher at University of California, Berkeley
Publications - 10
Citations - 194
Stephen Z. D. Cheng is an academic researcher from University of California, Berkeley. The author has contributed to research in topics: Polyimide & Waveplate. The author has an hindex of 5, co-authored 10 publications receiving 185 citations.
Papers
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Journal ArticleDOI
Rubbing-induced molecular reorientation on an alignment surface of an aromatic polyimide containing cyanobiphenyl side chains.
Jason J. Ge,Christopher Y. Li,Gi Xue,Ian Mann,Dong Zhang,Shyh-Yeu Wang,Frank W. Harris,Stephen Z. D. Cheng,Seok Cheol Hong,Xiaowei Zhuang,Y. R. Shen +10 more
TL;DR: Results show that prior to rubbing the surface, both the pendent cyanobiphenyls in the side chains and backbones possess nearly planar chain conformations at the polyimide surface, and the polar cyano groups point down toward the layer surface deduced from SHG phase measurements.
Patent
Waveplate and optical circuit formed from mesogen-containing polymer
Ken Purchase,Martin Mckenzie,Lili Huang,Stephen Z. D. Cheng,Frank W. Harris,Jason J. Ge,Dong Zhang +6 more
TL;DR: In this article, the mesogen-containing polymers and planar lightwave circuits containing such waveplates are discussed and a model of the wavelet wavelet is proposed, which has a glass transition temperature between 100 °C and 300 °C, and polymers may be stretched in excess of 150% to increase birefringence of polymers.
Patent
Process for preparing aromatic polyimide fibers
TL;DR: In this paper, a process for preparing polyimide fibers involves the preparation of a polymer in p-chlorophenol from reactants comprising 2,2'-dimethyl-4,4'-diaminobiphenyl and a tetracarboxylic anhydride.
Patent
Polymide lcd alignment layer
TL;DR: In this paper, a method for inducing a predetermined orientation of a liquid crystal material is also disclosed, which includes applying an alignment layer material to a substrate and buffing the alignment surface material, thereby providing an alignment surface with a pre-tilt angle.
Book ChapterDOI
Isothermal Thickening and Thinning Processes in Low Molecular Weight Poly(ethylene oxide) Fractions Crystallized from the Melt: Effects of Molecular Configurational Defects on Crystallization, Melting, and Annealing
Er-Qiang Chen,Song-Wook Lee,Anqiu Zhang,Bon-Suk Moon,Ian Mann,Frank W. Harris,Stephen Z. D. Cheng,Benjamin Hsiao,Fengji Yeh,Ernst D. von Meerwall +9 more