MDI-Based Polyurethane Elastomers Using Di-(2-hydroxyethyl) Disulfide as a Curative

摘要

Di-(2-Hydroxyethyl) disulfide (DiHEDS) has a similar structure to 1,4-butanediol (BDO) except that there are two sulfur atoms in the middle of the molecule. This paper gives an overview of MDI-based elastomer properties using DiHEDS versus BDO. Physical and thermal mechanical elastomer properties are presented. The main objective of this study is determining the stoichiometry of MDI-based elastomers using x-ray fluorescence (XRF). Traditionally, only TDI-based systems make use of measuring stoichiometry by XRF, due to the curatives containing chlorine or sulfur atoms. In this paper, the sulfur content of MDI elastomers cured with DiHEDS was determined using XRF. A study is given showing the accuracy of predicting the stoichiometry from these sulfur values. A secondary study was done using blends of diols with DiHEDS to look at a more economical solution for the end user.