Effect of 1,2,3-trichloropropane as tri-functional monomer on thermophysical properties of poly(ethylene tetrasulfide)

Document Type: Research Article

Authors

1 Department of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, I.R. IRAN

2 Sahand University of Technology, Department of Polymer Engineering

3 Department of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran

Abstract

In this study, effect of 1,2,3-trichloropropane (TCP) as trifunctional monomer on thermophysical properties of synthesized poly(ethylene tetrasulfide) (PETS) is investigated. To this end, different amounts of TCP (0-40 mol. % of halide-containing monomer) were incorporated into structure of polysulfide polymer via interfacial condensation polymerization. Measurement of gel fraction showed that by introduction of only 10 mol. % of TCP, synthesized structure is almost crosslinked. The X-ray diffraction (XRD) results revealed that all samples are semi-crystalline whereas crystallinity of samples strongly depends on amount of TCP. All samples showed a glass transition temperature (Tg) less than 0 °C followed by a melting temperature (Tm). Higher amount of crosslinking monomer resulted in higher Tg while Tm and heat of fusion (ΔHm) were reduced. According to thermogravimetric analysis (TGA) results, all samples exhibited a two-stage degradation process. Although, introduction of 10 mol. % TCP into structure of PETS resulted in lower thermal stability of obtained polymer, adding higher amounts of TCP led to higher thermal stability of polymers.

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