Get This Paper




Authors: Sandra Milev, Christopher J. Kloxin, Jovan Tatar

DOI: 10.33599/nasampe/s.23.0018

Abstract: As transportation agencies largely neglect joint sealant maintenance in concrete pavements, water infiltration into the deteriorated joint and subgrade often results in base softening, erosion, and faulting, posing a significant financial burden on taxpayers. To improve the durability performance of concrete pavement sealants, an elastomer with self-healing ability was designed by incorporating dynamic disulfide bonds. The sealant was prepared using commercially available liquid polysulfides and epoxy resin. Sealant performance and self-healing were optimized by changing the type of polysulfide oligomers, the stoichiometric ratio of epoxy to thiol, and catalyst content. Preliminary mechanical tests under ambient conditions show that reducing the stoichiometric ratio from 1 to 0.9 and reducing the cross-linking density increased the ultimate elongation from 386% to 688%. The addition of 1% of the catalyst increased self-healing efficiency (measured as a percentage of recovered elongation) by 56%. Although the primary focus of this work was on transportation infrastructure applications, the developed material design concepts can be universally applied to self-healing sealants for applications in the aircraft and automotive industry.

References: [1] NCHRP 568. Portland Cement Concrete Pavement Joint Sealant Practices and Performance. National Academies Press; 2021. [2] Lu L, Zhao D, Fan J, Li G. A brief review of sealants for cement concrete pavement joints and cracks ABSTRACT 2022. [3] Kloxin CJ, Bowman CN. Covalent adaptable networks: Smart, reconfigurable and responsive network systems. Chem Soc Rev 2013;42:7161–73. [4] Winne JM, Leibler L, Du Prez FE. Dynamic covalent chemistry in polymer networks: a mechanistic perspective. Polym Chem 2019;10:6091. [5] Van Zee NJ, Nicolaÿ R. Vitrimers: Permanently crosslinked polymers with dynamic network topology. Prog Polym Sci 2020;104:101233. [6] Scheutz GM, Lessard JJ, Sims MB, Sumerlin BS. Adaptable Crosslinks in Polymeric Materials : Resolving the Intersection of Thermoplastics and Thermosets 2019. [7] Hammer L, Van Zee NJ, Nicolaÿ R. Dually crosslinked polymer networks incorporating dynamic covalent bonds. Polymers (Basel) 2021;13:1–34. [8] Denissen W, Rivero G, Nicolaÿ R, Leibler L, Winne JM, Du Prez FE. Vinylogous urethane vitrimers. Adv Funct Mater 2015;25:2451–7. [9] Rekondo A, Martin R, Ruiz De Luzuriaga A, Cabañero G, Grande HJ, Odriozola I. Catalyst-free room-temperature self-healing elastomers based on aromatic disulfide metathesis. Mater Horizons 2014;1:237–40. [10] Nevejans S, Ballard N, Fernández M, Reck B, García SJ, Asua JM. The challenges of obtaining mechanical strength in self-healing polymers containing dynamic covalent bonds. Polymer (Guildf) 2019;179:121670. [11] Gao H, Sun Y, Wang M, Wu B, Han G, Jin L, et al. Self-healable and reprocessable acrylate-based elastomers with exchangeable disulfide crosslinks by thiol-ene click chemistry. Polymer (Guildf) 2021. [12] Gao W, Bie M, Liu F, Chang P, Quan Y. Self-Healable and Reprocessable Polysulfide Sealants Prepared from Liquid Polysulfide Oligomer and Epoxy Resin. ACS Appl Mater Interfaces 2017;9:15798–808. [13] Bode S, Enke M, Hernandez M, Bose RK, Grande AM, van der Zwaag S, et al. Characterization of self-healing polymers: From macroscopic healing tests to the molecular mechanism. Adv Polym Sci 2016;273:113–42. [14] Zhang J, Wang Z, Ding G, Quan Y, Chen Q. The Effect of Epoxy Resin to Reduce the Compression Set of Polysulfide Sealant 2012;125:390–5. [15] Robinson R. One-part polysulfide-based sealant compositions. 92311416.9, 1992. [16] ASTM D1985. Standard Practice for Preparing Concrete Blocks for Testing Sealants, for Joints and Cracks. ASTM Int 100 Barr Harb Drive, PO Box C700, West Conshohocken, PA, US 2019:30–2. [17] Konuray O, Fern X, Flor S De, Ramis X, Serra À. The Use of Click-Type Reactions in the Preparation of Thermosets 2020. [18] ASTM C1135. Standard test method for determining tensile adhesion properties of structural sealants 2005;00:6–9. [19] Ramaswamy R, Sasidharab A. Adhesion Development in a Polysulphide Sealant. J Adhes 1981;11.

Conference: SAMPE 2023

Publication Date: 2023/04/17

SKU: TP23-0000000018

Pages: 12

Price: $24.00

Get This Paper