Photopolymerizable liquid crystal monomer-oxide nanoparticle composites

S. T. Wellinghoff, D. P. Nicolella, D. P. Hanson, Henry R Rawls, B. K. Norling

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Methacrylate and acrylate terminated monomers can be rapidly polymerized to polymer glasses useful in biomaterials, photolithography and rapid prototyping, optical coatings and composites. Unfortunately, polymerization shrinkage results in loss of tolerance and the development of internal stresses which can be especially critical in the case of highly crosslinked glasses. Structurally complicated oligomeric mixes of dimethacrylate monomers that exhibit a nematic liquid crystal to isotropic transition above room temperature have been synthesized in a low cost one pot synthesis to surmount the problem of polymerization shrinkage and the propensity of single component monomers to crystallize from the liquid state. Photopolymerization from the ordered liquid crystal state into a less ordered glass minimizes volumetric shrinkages to between 1-2% at greater than 90% polymerization conversion. These polymer glasses exhibited elastic bending moduli of 1.2 GPa to 1.5GPa, fracture strengths of 70-100MPa and fracture toughness of K=0.3-0.4 (MPa)1/2. In some cases the glasses exhibited ductile behavior which is unusual for highly crosslinked materials. Room temperature viscosities of 100P-2000P permit facile processing of the liquid crystal monomers with inorganic particles to make dental restorative composites.

Original languageEnglish (US)
Title of host publicationASME International Mechanical Engineering Congress and Exposition, Proceedings
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages275-280
Number of pages6
ISBN (Print)0791836401, 9780791836408
DOIs
StatePublished - 2002

Fingerprint

Liquid crystals
Monomers
Nanoparticles
Glass
Oxides
Composite materials
Polymerization
Fracture toughness
Dental composites
Optical coatings
Photopolymerization
Nematic liquid crystals
Rapid prototyping
Photolithography
Polymers
Biomaterials
Residual stresses
Viscosity
Temperature
Liquids

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Wellinghoff, S. T., Nicolella, D. P., Hanson, D. P., Rawls, H. R., & Norling, B. K. (2002). Photopolymerizable liquid crystal monomer-oxide nanoparticle composites. In ASME International Mechanical Engineering Congress and Exposition, Proceedings (pp. 275-280). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2002-39367

Photopolymerizable liquid crystal monomer-oxide nanoparticle composites. / Wellinghoff, S. T.; Nicolella, D. P.; Hanson, D. P.; Rawls, Henry R; Norling, B. K.

ASME International Mechanical Engineering Congress and Exposition, Proceedings. American Society of Mechanical Engineers (ASME), 2002. p. 275-280.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wellinghoff, ST, Nicolella, DP, Hanson, DP, Rawls, HR & Norling, BK 2002, Photopolymerizable liquid crystal monomer-oxide nanoparticle composites. in ASME International Mechanical Engineering Congress and Exposition, Proceedings. American Society of Mechanical Engineers (ASME), pp. 275-280. https://doi.org/10.1115/IMECE2002-39367
Wellinghoff ST, Nicolella DP, Hanson DP, Rawls HR, Norling BK. Photopolymerizable liquid crystal monomer-oxide nanoparticle composites. In ASME International Mechanical Engineering Congress and Exposition, Proceedings. American Society of Mechanical Engineers (ASME). 2002. p. 275-280 https://doi.org/10.1115/IMECE2002-39367
Wellinghoff, S. T. ; Nicolella, D. P. ; Hanson, D. P. ; Rawls, Henry R ; Norling, B. K. / Photopolymerizable liquid crystal monomer-oxide nanoparticle composites. ASME International Mechanical Engineering Congress and Exposition, Proceedings. American Society of Mechanical Engineers (ASME), 2002. pp. 275-280
@inproceedings{41936b750d154700b8bca18884cbfd3c,
title = "Photopolymerizable liquid crystal monomer-oxide nanoparticle composites",
abstract = "Methacrylate and acrylate terminated monomers can be rapidly polymerized to polymer glasses useful in biomaterials, photolithography and rapid prototyping, optical coatings and composites. Unfortunately, polymerization shrinkage results in loss of tolerance and the development of internal stresses which can be especially critical in the case of highly crosslinked glasses. Structurally complicated oligomeric mixes of dimethacrylate monomers that exhibit a nematic liquid crystal to isotropic transition above room temperature have been synthesized in a low cost one pot synthesis to surmount the problem of polymerization shrinkage and the propensity of single component monomers to crystallize from the liquid state. Photopolymerization from the ordered liquid crystal state into a less ordered glass minimizes volumetric shrinkages to between 1-2{\%} at greater than 90{\%} polymerization conversion. These polymer glasses exhibited elastic bending moduli of 1.2 GPa to 1.5GPa, fracture strengths of 70-100MPa and fracture toughness of K=0.3-0.4 (MPa)1/2. In some cases the glasses exhibited ductile behavior which is unusual for highly crosslinked materials. Room temperature viscosities of 100P-2000P permit facile processing of the liquid crystal monomers with inorganic particles to make dental restorative composites.",
author = "Wellinghoff, {S. T.} and Nicolella, {D. P.} and Hanson, {D. P.} and Rawls, {Henry R} and Norling, {B. K.}",
year = "2002",
doi = "10.1115/IMECE2002-39367",
language = "English (US)",
isbn = "0791836401",
pages = "275--280",
booktitle = "ASME International Mechanical Engineering Congress and Exposition, Proceedings",
publisher = "American Society of Mechanical Engineers (ASME)",

}

TY - GEN

T1 - Photopolymerizable liquid crystal monomer-oxide nanoparticle composites

AU - Wellinghoff, S. T.

AU - Nicolella, D. P.

AU - Hanson, D. P.

AU - Rawls, Henry R

AU - Norling, B. K.

PY - 2002

Y1 - 2002

N2 - Methacrylate and acrylate terminated monomers can be rapidly polymerized to polymer glasses useful in biomaterials, photolithography and rapid prototyping, optical coatings and composites. Unfortunately, polymerization shrinkage results in loss of tolerance and the development of internal stresses which can be especially critical in the case of highly crosslinked glasses. Structurally complicated oligomeric mixes of dimethacrylate monomers that exhibit a nematic liquid crystal to isotropic transition above room temperature have been synthesized in a low cost one pot synthesis to surmount the problem of polymerization shrinkage and the propensity of single component monomers to crystallize from the liquid state. Photopolymerization from the ordered liquid crystal state into a less ordered glass minimizes volumetric shrinkages to between 1-2% at greater than 90% polymerization conversion. These polymer glasses exhibited elastic bending moduli of 1.2 GPa to 1.5GPa, fracture strengths of 70-100MPa and fracture toughness of K=0.3-0.4 (MPa)1/2. In some cases the glasses exhibited ductile behavior which is unusual for highly crosslinked materials. Room temperature viscosities of 100P-2000P permit facile processing of the liquid crystal monomers with inorganic particles to make dental restorative composites.

AB - Methacrylate and acrylate terminated monomers can be rapidly polymerized to polymer glasses useful in biomaterials, photolithography and rapid prototyping, optical coatings and composites. Unfortunately, polymerization shrinkage results in loss of tolerance and the development of internal stresses which can be especially critical in the case of highly crosslinked glasses. Structurally complicated oligomeric mixes of dimethacrylate monomers that exhibit a nematic liquid crystal to isotropic transition above room temperature have been synthesized in a low cost one pot synthesis to surmount the problem of polymerization shrinkage and the propensity of single component monomers to crystallize from the liquid state. Photopolymerization from the ordered liquid crystal state into a less ordered glass minimizes volumetric shrinkages to between 1-2% at greater than 90% polymerization conversion. These polymer glasses exhibited elastic bending moduli of 1.2 GPa to 1.5GPa, fracture strengths of 70-100MPa and fracture toughness of K=0.3-0.4 (MPa)1/2. In some cases the glasses exhibited ductile behavior which is unusual for highly crosslinked materials. Room temperature viscosities of 100P-2000P permit facile processing of the liquid crystal monomers with inorganic particles to make dental restorative composites.

UR - http://www.scopus.com/inward/record.url?scp=78249242150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78249242150&partnerID=8YFLogxK

U2 - 10.1115/IMECE2002-39367

DO - 10.1115/IMECE2002-39367

M3 - Conference contribution

AN - SCOPUS:78249242150

SN - 0791836401

SN - 9780791836408

SP - 275

EP - 280

BT - ASME International Mechanical Engineering Congress and Exposition, Proceedings

PB - American Society of Mechanical Engineers (ASME)

ER -