Transparent UV Cured Coatings Enabled by Biomass Phytic Acid with Enhanced Flame Retardancy and Low Temperature Toughness

Yu Yu; Sheng-Hua Yang; Hong-Yu Yuan; Feng Liu; Xia-Ming Feng; Hong-Yu Yang; Chao-Jun Wan

doi:10.1007/s10118-026-3801-8

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Transparent UV Cured Coatings Enabled by Biomass Phytic Acid with Enhanced Flame Retardancy and Low Temperature Toughness

RESEARCH ARTICLE | Updated：2026-09-22

- Transparent UV Cured Coatings Enabled by Biomass Phytic Acid with Enhanced Flame Retardancy and Low Temperature Toughness
- Chinese Journal of Polymer Science Vol. 44, Pages: 1-12(2026)
- Affiliations：
  
  a.College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
  b.State Key Laboratory of Safety and Resilience of Civil Engineering in Mountain Area, Chongqing University, Chongqing 400044, China
- Author bio：
  
  fengxm@cqu.edu.cn (X.M.F.)
  yhongyu@cqu.edu.cn (H.Y.Y.)
- Funds：
- DOI：10.1007/s10118-026-3801-8
  CLC：
- Received：18 May 2026，
  
  Accepted：03 July 2026，
  
  Online First：22 September 2026，
  
  Published：2026-08
- Accepted：
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Yu, Y.; Yang, S. H.; Yuan, H. Y.; Liu, F.; Feng, X. M.; Yang, H. Y.; Wan, C. J. Transparent UV cured coatings enabled by biomass phytic acid with enhanced flame retardancy and low temperature toughness. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3801-8

Yu Yu, Sheng-Hua Yang, Hong-Yu Yuan, et al. Transparent UV Cured Coatings Enabled by Biomass Phytic Acid with Enhanced Flame Retardancy and Low Temperature Toughness[J/OL]. Chinese Journal of Polymer Science, 2026, 441-12.
Yu, Y.; Yang, S. H.; Yuan, H. Y.; Liu, F.; Feng, X. M.; Yang, H. Y.; Wan, C. J. Transparent UV cured coatings enabled by biomass phytic acid with enhanced flame retardancy and low temperature toughness. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3801-8 DOI：

Yu Yu, Sheng-Hua Yang, Hong-Yu Yuan, et al. Transparent UV Cured Coatings Enabled by Biomass Phytic Acid with Enhanced Flame Retardancy and Low Temperature Toughness[J/OL]. Chinese Journal of Polymer Science, 2026, 441-12. DOI： 10.1007/s10118-026-3801-8.

摘要

Abstract

Ultraviolet (UV) curable transparent coatings are widely used in construction; however

achieving a balance between flame retardancy

transparency

and mechanical robustness

especially resistance to low-temperature brittleness

remains a challenge. Herein

we report a photocurable flame retardant coating system based on bis(methacryloyloxyethyl) phosphate (Bis-p) and bio-based phytic acid (PA). The coating preserved transparency (more than 85% visible-light transmittance) and a surface hardness (3H up to 10% PA)

and maintained visible integrity in chemical immersion tests while improving mechanical performance. At –20 °C

the tensile strength and fracture toughness of PA5 were more than twice those of the control coating. It was found that sacrificial hydrogen bonds between the P―OH groups of PA and the Bis-p matrix contribute to reversible physical crosslinking. Under stress

hydrogen bonds break preferentially to dissipate energy

enhancing the toughness without compromising the integrity of the primary network. With increasing PA content

the limiting oxygen index increased from 29.5% to 34.5%. Samples with 10% and 15% PA achieved UL-94 V-0 rating. Cone calorimetry showed that

compared with PA0

PA15 reduced the peak heat release rate by 44.38%

smoke production rate by 48.37%

and CO production by 45.79%. An analytic hierarchy process (AHP) confirmed that PA15 reduced the overall fire risk. This study shows that introducing sacrificial hydrogen bonds through a bio-based additive offers a strategy for designing UV curable transparent coatings that overcome the trade-off between toughness and other essential properties.

关键词

Keywords

references

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