Effect of 1,2,3-Trichloropropane as Tri-Functional Monomer on Thermophysical Properties of Poly(ethylene tetrasulfide)

摘要

In this study, the 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 the structure of polysulfide polymer via interfacial condensation polymerization. Measurement of gel, fraction showed that by the 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 the crystallinity of samples strongly depends on the amount of TCP. All samples showed a glass transition temperature (T-g) less than 0 degrees C followed by melting temperature (T-m). Higher amount of crosslinking monomer resulted in higher T-g while T-m and heat of fusion (Delta H-m) were reduced. According to ThermoGravimetric Analysis (TGA) results, all samples exhibited a two-stage degradation process. Although, the introduction of 10 mol. % TCP into the structure of PETS resulted in lower thermal stability of obtained polymer, adding higher amounts of TCP led to the higher thermal stability of polymers.