TY - GEN
T1 - LIQUID RUBBER MODIFICATION OF VINYL ESTER RESINS TO OBTAIN TOUGHENED THERMOSETS FOR PHOTOLITHOGRAPHY
AU - McLaughlin, Jaclyn A.
AU - Palmese, Giuseppe R.
N1 - Funding Information:
Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-14-2-0227. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes not withstanding any copyright notation herein.
Publisher Copyright:
Copyright 2022. Used by the Society of the Advancement of Material and Process Engineering with permission.
PY - 2022
Y1 - 2022
N2 - There exists a large demand for the fabrication of polymeric engineering parts by additive manufacturing. While many available thermoset photolithography resins achieve desirable performance capabilities, these systems commonly exhibit low fracture toughness due to their highly crosslinked structures. This limits the application of additively manufacture thermosets. A well-established method for toughening conventional thermosets is by secondary phase modification via functionally terminated butadiene-acrylonitrile (TBN) elastomers. However, due to poor compatibility with acrylate-based resins and high viscosity, these additives have yet to be implemented within photolithography resins. In this study, a low viscosity, bio-based, liquid rubber (Oct3) is added to photocurable vinyl ester resins and its toughening effect on printed thermosets was observed. The performance of printed thermosets modified with Oct3 is directly compared to thermosets containing vinyl-terminated butadiene acrylonitrile. Processable conditions were maintained when Oct3 was added to the base resin in various amounts (5-15 phr). Fracture toughness (KQ) of modified thermosets was observed to increase from 0.48 ± 0.01 MPa∙m1/2 to 0.83 ± 0.14 MPa∙m1/2 when 15 phr Oct3 was incorporated to the resin.
AB - There exists a large demand for the fabrication of polymeric engineering parts by additive manufacturing. While many available thermoset photolithography resins achieve desirable performance capabilities, these systems commonly exhibit low fracture toughness due to their highly crosslinked structures. This limits the application of additively manufacture thermosets. A well-established method for toughening conventional thermosets is by secondary phase modification via functionally terminated butadiene-acrylonitrile (TBN) elastomers. However, due to poor compatibility with acrylate-based resins and high viscosity, these additives have yet to be implemented within photolithography resins. In this study, a low viscosity, bio-based, liquid rubber (Oct3) is added to photocurable vinyl ester resins and its toughening effect on printed thermosets was observed. The performance of printed thermosets modified with Oct3 is directly compared to thermosets containing vinyl-terminated butadiene acrylonitrile. Processable conditions were maintained when Oct3 was added to the base resin in various amounts (5-15 phr). Fracture toughness (KQ) of modified thermosets was observed to increase from 0.48 ± 0.01 MPa∙m1/2 to 0.83 ± 0.14 MPa∙m1/2 when 15 phr Oct3 was incorporated to the resin.
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M3 - Conference contribution
AN - SCOPUS:85136260840
T3 - International SAMPE Technical Conference
BT - SAMPE 2022 Conference and Exhibition
PB - Soc. for the Advancement of Material and Process Engineering
T2 - SAMPE 2022 Conference and Exhibition
Y2 - 23 May 2022 through 26 May 2022
ER -