Functional siloxanes with photo-activated, simultaneous chain extension and crosslinking for lithography-based 3D printing

Justin M. Sirrine, Viswanath Meenakshisundaram, Nicholas G. Moon, Philip J. Scott, Ryan J. Mondschein, Tobin F. Weiseman, Christopher B. Williams, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A novel, poly(dimethyl siloxane)-based photopolymer that exhibits simultaneous linear chain extension and crosslinking was suitable for vat photopolymerization additive manufacturing. Photopolymer compositions consisted of dithiol and diacrylate functional poly(dimethyl siloxane) oligomers, where simultaneous thiol-ene coupling and free radical polymerization provided for linear chain extension and crosslinking, respectively. Compositions possessed low viscosity before printing and the modulus and tensile strain at break of a photocured, higher molecular weight precursor after printing. Photorheology and soxhlet extraction demonstrated highly efficient photocuring, revealing a calculated molecular weight between crosslinks of 12,600 g/mol and gel fractions in excess of 90% while employing significantly lower molecular weight precursors (i.e. < 5300 g/mol). These photocured objects demonstrated a 2× increase in tensile strain at break as compared to a photocured 5300 g/mol PDMS diacrylamide alone. These results are broadly applicable to the advanced manufacturing of objects requiring high elongation at break.

Original languageEnglish (US)
Pages (from-to)25-34
Number of pages10
JournalPolymer
Volume152
DOIs
StatePublished - Sep 12 2018
Externally publishedYes

Keywords

  • 3D printing
  • Additive manufacturing
  • Elastomer
  • PDMS
  • Photopolymer
  • Poly(dimethylsiloxane)
  • Stereolithography
  • Thiol-ene
  • Vat photopolymerization

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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