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Polymers and Polymer Composites

Isocyanate-functionalised montmorillonite as a reactive asphalt modifier

May 1, 2017 By: Dengke Zhang; Xinyan Xiao; Ying Cui Research article

Title: Isocyanate-functionalised montmorillonite as a reactive asphalt modifier
Page Range: p.405-418
Author(s): Dengke Zhang; Xinyan Xiao; Ying Cui
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 25
Issue No: No.5

Abstract
Sodium montmorillonite was functionalised by isophorone diisocyanate (IPDI) and organic montmorillonite was functionalised by hydrogenated diphenylmethane diisocyanate (HMDI). Reaction between montmorillonite (MMT) and IPDI/HMDI caused the interlayer space of MMT to increase from 1.41 nm to 1.95 nm and 2.08 nm to 2.42 nm, respectively, and the resulting grafted -NCO groups led to a suitable reactive modifier. In order to improve the high-temperature performance and UV ageing resistance of the asphalt binder, asphalt modification was carried out by chemical reaction between -NCO groups and some polar groups (mainly -OH) of asphalt. The results showed that the interlayer space enlarged and exfoliated structure was formed due to the introduction of functionalised MMT (IPDI-HMMT-85 or HMDI-OMMT-80) into the asphalt. The as-prepared IPDI-HMMT-85 and HMDI-OMMT-80 modified asphalts, with a maximum softening point of 57.0 5C and 62.2 CC, initial decomposition temperature of 363 CC and 374 CC, respectively, possessed good storage stability, and were superior to Na-MMT modified asphalt and OMMT modified asphalt in terms of high temperature and UV ageing properties. 39 Refs.

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