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Submitted on: 23 March 1999.
Revised on: 07 May 1999.
Accepted on: 09 June 1999.
___________________CHINESE JOURNAL OF POLYMER SCIENCE
Submitted on: 23 February 2014.
Revised on: 09 May 2014.
Accepted on: 18 June 2014.
___________________CHINESE JOURNAL OF POLYMER SCIENCE
Submitted on: 20 April 2011.
Revised on: 19 May 2011.
Accepted on: 30 May 2011.
___________________CHINESE JOURNAL OF POLYMER SCIENCE