Synthesis and Characterization of a Novel Carbazolecontaining Branched Random Copolymer Derived from α-Norbornene Methylene Polystyrene Macromonomer via  Ring-opening Metathesis Polymerization

Der-Jang Liaw; Ching-Cheng Huang; Chih-Hung Tsai

doi:10.6180/jase.2003.6.3.01

Synthesis and Characterization of a Novel Carbazolecontaining Branched Random Copolymer Derived from α-Norbornene Methylene Polystyrene Macromonomer via Ring-opening Metathesis Polymerization

Chemical Engineering

Der-Jang Liaw ¹, Ching-Cheng Huang¹ and Chih-Hung Tsai¹

¹Department of Chemical Engineering National Taiwan University of Science and Technology Taipei, Taiwan 106, R.O.C.

Received: May 8, 2003
Accepted: June 5, 2003
Publication Date: September 1, 2003

Download Citation: ||https://doi.org/10.6180/jase.2003.6.3.01

ABSTRACT

A novel method for preparing α-norbornene methylene polystyrene macromonomer (NBMPSt) is reported. NBMPSt macromonomer (Mn = 1.60 × 10⁵ and PDI = 1.26) had glass transition temperature (Tg) of 107 ºC for polystyrene segment. Since the homopolymerization of NBMPSt macromonomer with number average molecular weight (Mn ) 1.60 ×10⁵ could not be carried out by ring-opening metathesis polymerization (ROMP) with Ru catalyst [(Cy3P)2Cl2Ru=CHPh, Cy = cyclohexyl], ring-opening metathesis copolymerization of NBMPSt macromonomer containing norbornene end group and norbornene monomer containing carbazole group (NBCbz) was investigated. A branched random copolymer containing carbazole groups and polystyrene segments, poly (NBMPSt-coNBCbz), was successfully obtained (Mn = 3.99 × 10⁵ and PDI = 1.30). The molecular weight distributions of NBMPSt macromonomer and branched random poly(NBMPSt-co-NBCbz) are narrow. Branched random poly(NBMPSt-co-NBCbz) exhibited good solubility in a variety of solvents such as methylene chloride, chloroform, tetrahydrofuran, 1,2-dichlorobenzene, and even in xylene and benzene at room temperature or upon heating to 60 ºC.

Keywords: ROMP, Ru Catalyst, Carbazole, Branched, Random Copolymer

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