A novel impact hardening polymer with negative Poisson's ratio for impact protection

Kun Xu, Ying Tan, John Haozhong Xin, Yanping Liu, Cuige Lu, Yukun Deng, Changyu Han, Hong Hu, Pixin Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


Although lots of impact protective materials reported exhibited better impact protective performance thanking to their excellent mechanical performance, their applications were still seriously impeded due to absence of soft-stiffness switch smartness. Herein, a novel impact hardening polymer (IHP) with negative Poisson's ratio was synthesized via a condensation polymerization, followed by a simple thermal annealing to achieve a perfect soft-stiffness switch characteristic and self-healing capacity. Its soft-stiffness switch ability σ, defined as G'max/G'minin rheological analysis, can reach 9000, which is never reported so far. The result of laser speckle scatter measurement elucidates that IHP has negative Poisson's ratio, which is the root cause why IHP exhibits soft-stiffness switch capacity. Finally, 3D composite anti-impact fabrics were prepared by dip-coating IHP dispersion onto a 3D porous polyester fabric. Not only the impact protective performance of anti-impact fabrics finished with the IHP is significantly improved, but also the flexibility and hand feeling of anti-impact fabrics finished with the IHP are obviously very good because the IHP is flexible without impact.
Original languageEnglish
Pages (from-to)50-59
Number of pages10
JournalMaterials Today Communications
Publication statusPublished - 1 Dec 2015


  • Impact hardening
  • Self-healing
  • Soft-stiffness switch
  • The negative poisson's ratio

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Materials Chemistry

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