NDLI: Influence of Chain Extender on Soft and Hard Segment of Polyurethane Elastomers Patcharapon

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Influence of Chain Extender on Soft and Hard Segment of Polyurethane Elastomers Patcharapon

Content Provider	Semantic Scholar
Copyright Year	2018
Abstract	The goal of this study is investigation of the effect of chain extender content consisting of flexible polyurethane elastomers at 7 phr and rigid polyurethane elastomers at 34 phr on mechanical, thermal and structural properties of polyurethane elastomers (PUR). Firstly, polypropylene glycol (PPG) was solution mixed with chain extender, amine catalyst, air release additive and moisture scavenger. After that, the mixture was shear mixed with diphenylmethane-4,4’-diisocyanate (MDI). In this study, the chain extender is monoethylene glycol (EG). Mechanical properties of polyurethane elastomers were tested by Shore A/D hardness and tensile test. Thermal properties and structure were investigated by differential scanning calorimetry (DSC) and thermally stimulated discharge (TSD) method. Density was also measured in the study. Results show Shore A and D hardness increase with increasing EG content from 7 to 34 phr. Tensile strength increases when EG content is increased while elongation at break decreases at EG content of 34 phr. Density of PUR slightly increases when EG content is increased. For structure characterization, DSC thermogram clearly observed a relaxation temperature of soft segment at EG content of 7 phr. Furthermore, TSD technique was used to investigate chain relaxation of PUR as well. Results show the same soft segment glass transition temperatures for both EG content 7 and 34 phr. However, the glass transition temperature of soft segment measured by DSC is lower than that shown by the TSD technique.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://midra.uni-miskolc.hu/JaDoX_Portlets/displayContent?docId=33190&secId=29341
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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