|Table of Contents|

Preparation and microscopic mechanism study of thermally induced shape memory polyurethane modified asphalt(PDF)

长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年03期
Page:
26-38
Research Field:
道路工程
Publishing date:

Info

Title:
Preparation and microscopic mechanism study of thermally induced shape memory polyurethane modified asphalt
Author(s):
FENG Xin-jun REN Hong-yu
(Department of Traffic and Transportation Engineering, Changsha University of Science &Technology, Changsha 410114, Hunan, China)
Keywords:
road engineering modified asphalt orthogonal experiment SMPU shape memory performance microscopic mechanism
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2025.03.003
Abstract:
A thermally induced shape memory polyurethane modified asphalt(SMPU-MA)with enhanced self-healing capacity suitable for asphalt pavement service temperatures was developed to prolong pavement service life. The SMPU prepolymer was synthesized by using prepolymer method with polyethylene adipate-1,4-butanediol ester(PBAG)as soft segment, toluene-2,4-diisocyanate(TDI)as hard segment, and trimethylolpropane(TMP)as chain extender for matrix asphalt modification. The optimal preparation parameters for SMPU-MA were determined through orthogonal experiments; modified asphalt properties were evaluated by softening point, penetration, ductility, Brookfield viscosity, segregation tests, and shape memory performance evaluation; the glass transition temperature and shape recovery mechanism of SMPU-MA were investigated through differential scanning calorimetry and shape memory performance tests; modification mechanisms were analyzed by using Fourier transform infrared spectroscopy and gel permeation chromatography. The results shows that themolor ratio of PBAG, TDI, and TMP for the optimal preparation parameters of SMPU-MA is 1:8:14/3, PBAG molecular weight is 3 000, reaction temperature of SMPU is 80 ℃, and reaction duration of SMPU is 120 min; compared with base asphalt, SMPU-MA exhibits8.7 ℃ higher softening point, 87.1(0.1mm)penetration at 25 ℃, 12.6 cm ductility at5 ℃, 623 mPa·s viscosity at 135 ℃, 0.2 ℃ segregation softening point difference,31.4 ℃ glass transition temperature, and 53.3% shape recovery rate; the incorporation of SMPU enables SMPU-MA to demonstrate characteristic shape recovery capability through glass-to-rubber transition of soft segments, which reduces the self-healing index and consequently enhances asphalt's self-healing capacity; chemical reactions between -NCO groups in SMPU prepolymer and active hydrogen-containing functional groups in asphalt as well as -OH in TMP chain extender form urethane linkages, so the addition of SMPU increases the proportion of macromolecules while decreasing small molecules, thereby improving storage stability and high-temperature performance of modified asphalt.12 tabs, 9 figs, 34 refs.

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Last Update: 2025-05-30