Additive Manufacturing of Hydrocarbon Elastomers via Simultaneous Chain Extension and Cross-linking of Hydrogenated Polybutadiene

Philip J. Scott, Viswanath Meenakshisundaram, Nicholas A. Chartrain, Justin M. Sirrine, Christopher B. Williams, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This work describes the first example of a hydrogenated polybutadiene elastomer photopolymer that addresses the process constraints of vat photopolymerization (VP) additive manufacturing. A synthetic method, which involves simultaneous thiol-ene step growth chain extension and acrylate cross-linking, addresses traditional challenges associated with this leading 3D printing platform. This facile, one-pot strategy combines the processing advantages of low molecular weight oligomers with the tunable thermomechanical and mechanical performance of higher molecular weight polymeric networks directly during printing, without requiring a postprocessing step. The addition of photoinitiator to mixtures of liquid polybutadiene oligomer and miscible dithiols enabled selective photocuring under UV exposure to form high-strain, elastic parts in comparison to neat diacrylate systems. Photolithographic printing of these photopolymers enabled the fabrication of three-dimensional, hydrocarbon elastomer objects. Photorheology elucidated curing behavior as a function of composition and UV intensity, while optical imaging and SEM revealed quality and resolution.

Original languageEnglish (US)
Pages (from-to)684-690
Number of pages7
JournalACS Applied Polymer Materials
Volume1
Issue number4
DOIs
StatePublished - Apr 12 2019
Externally publishedYes

Keywords

  • 3D printing
  • additive manufacturing
  • chain extension
  • elastomer
  • polybutadiene
  • thiol-acrylate
  • thiol-ene
  • vat photopolymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Process Chemistry and Technology
  • Organic Chemistry

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