Citation: . SEMI-QUANTITATIVE CHARACTERIZATION OF SEGMENT DISTRIBUTION IN LLDPE BASED ON THERMAL SEGREGATION*[J]. Chinese Journal of Polymer Science, ;2002, 20(4): 347-352. shu

SEMI-QUANTITATIVE CHARACTERIZATION OF SEGMENT DISTRIBUTION IN LLDPE BASED ON THERMAL SEGREGATION*

Received Date: 20 July 2001
Revised Date: 24 September 2001

Based on successive multiple-step isothermal crystallization and self-nucleation annealing methods, a novel semi-quantitative method for the characterization of segment distribution in linear low density polyethylene (LLDPE) wasestablished by treating the thermal analysis data using the Gibbs-Thomson equation. The method was used to describe thesegment distribution of Ziegler-Natta catalyzed LLDPE (Z-N LLDPE), metallocene catalyzed LLDPE (m-LLDPE) and two conunercial LLDPEs with wide molecular weight distribution.The differences of the results obtained from the two thermally treated samples were compared.The results of segment distribution of the polymers were discussed according to their microstructure data and were compared with their characteristics.It can be deduced from the results that this characterization method is effective to characterize the sequence structure of the branched ethylene copolymers.
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