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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 1
BKCSDE 21(1)
January 20, 2000 

 
Title
Capability of Thermal Field-Flow Fractionation for Analysis of Processed Natural Rubber
Author
Seungho Lee, Chul Hun Eum, Anthony R. Plepys
Keywords
Abstract
Applicability of Thermal field flow fractionation (ThFFF) was investigated for the analysis of masticated nat-ural rubber (NR) adhesives produced bya hot melt mastication process. An optimum ThFFF condition for NR analysis wasfound by using tetrahydrofuran (THF) as a solvent/carrier and a field-programming. Low flowrate (0.3 mL/min) was used to avoid stopping the flow for the sample relaxation. Measured molecular weight distribution was used to monitor degradation of rubber during the mastication process. Rubber samples collected at three different stages of the mastication process and were analyzed by ThFFF. It was found that in an anaer-obic process rubber degradation occurs at theresin-mixing (compounding) zone as well as in the initial break-down zone, while in an aerobic process most of degradation occurs at the initial breakdown zone. It was also found that E-beam radiation on NR causes a slight increasein the NR molecular weight due to the formation of a branched structure.
Page
69 - 74
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