Number: 421/35/97
Title: Effects of Side-Chain Branching on Processability of Commercial
Polycarbonates
Coordinator(s): M.
Takahashi, K. Sato,
T. Masuda
Completion Date: 2001
Objective:
Processability of polycarbonates, especially in blow molding process
is not well known. In this project, processability of blow molding,
extrusion, and injection molding of five commercial polycarbonates
including three branched polycarbonates will be investigated. Main
objective is to clarify relationships among molecular structure,
rheological properties, processability, and mechanical properties
of molded samples. As molecular structure, molecular weight, molecular
weight distribution, chemical analysis of branching agents, and
degree of branching will be studied. As rheological properties,
the followings will be studied; dynamic viscoelasticity in melt
and solid states, stress relaxation in shear and in biaxial extension,
uniaxial and biaxial extensional viscosity, non- Newtonian viscosity,
normal stress difference, swell ratio, and melt tension. This is
a very big and comprehensive project. It includes very fundamental
as well as applied studies. All results will contribute extremely
to our understanding and application on structure and properties
of commercial polymers.
Progress:
Experimental work is completed and published:
- "Influence of Long Chain Branching on Linear Viscoelastic
Flow Properties and Dielectric Relaxation of Polycarbonates",
by C. Liu,C. Li, P. Chen, J. He and Q. Fan
Polymer 45, 2803-2812 (2004)
doi: 10.1016/j.polymer.2004.02.030
Two papers for PAC are in preparation:
- "Characterisation and Rheological Properties of Three Polycarbonates
with Side-Chain Branching", by M. Takahashi, K. Sato, P. Tas,
J. He, M. Lecomte and T. Masuda
- "Characterisation, Rheological Properties and Processability
of Three Polycarbonates with Side-Chain Branching", by M. Takahashi,
K. Sakai, K. Sato, J. He, P. Tas and T. Masuda
Last update: 22 September 2005