TY - GEN
T1 - Cross-linked nonwoven fibers by room-temperature cure blowing and in situ photopolymerization
AU - Banerji, Aditya
AU - Jin, Kailong
AU - Liu, Kunwei
AU - Mahanthappa, Mahesh K.
AU - Ellison, Christopher J.
N1 - Publisher Copyright:
© 2019 American Chemical Society
PY - 2020
Y1 - 2020
N2 - Current synthetic nonwoven fiber production methods typically require transforming preformed polymers into a processable melt or solution state by heating or adding organic solvents, respectively, to facilitate fiber spinning. The significant energy demands and the use of volatile organic compounds render these processes suboptimal. Furthermore, conventional synthetic fiber manufacturing processes are limited to thermoplastics because cross-linked thermosets do not flow; however, the superior thermal and chemical resistance of cross-linked fibers render them attractive targets. In this study, we describe a “cure blowing” process that addresses these limitations by producing cross-linked fibers at room temperature with little or no solvent, using a lab-scale spinning die resembling those used for commercial melt blowing, an approach that currently produces >10% of global nonwovens. Specifically, a photocurable liquid mixture of thiol and acrylate monomers was extruded through an orifice and drawn by high-velocity air jets at ambient temperature into liquid fibers which were cross-linked into solid fibers by in situ photopolymerization during flight toward the collector. The effect of process parameters on the fiber diameter and morphology was investigated to understand the fundamental principles of cure blowing. Two intrinsic process limitations were identified in the drive to produce smaller yet uniform fibers, and strategies to circumvent them were identified. We anticipate that cure blowing may be an industrially relevant and environmentally friendly method for producing cross-linked polymeric nonwovens for a wide range of applications.
AB - Current synthetic nonwoven fiber production methods typically require transforming preformed polymers into a processable melt or solution state by heating or adding organic solvents, respectively, to facilitate fiber spinning. The significant energy demands and the use of volatile organic compounds render these processes suboptimal. Furthermore, conventional synthetic fiber manufacturing processes are limited to thermoplastics because cross-linked thermosets do not flow; however, the superior thermal and chemical resistance of cross-linked fibers render them attractive targets. In this study, we describe a “cure blowing” process that addresses these limitations by producing cross-linked fibers at room temperature with little or no solvent, using a lab-scale spinning die resembling those used for commercial melt blowing, an approach that currently produces >10% of global nonwovens. Specifically, a photocurable liquid mixture of thiol and acrylate monomers was extruded through an orifice and drawn by high-velocity air jets at ambient temperature into liquid fibers which were cross-linked into solid fibers by in situ photopolymerization during flight toward the collector. The effect of process parameters on the fiber diameter and morphology was investigated to understand the fundamental principles of cure blowing. Two intrinsic process limitations were identified in the drive to produce smaller yet uniform fibers, and strategies to circumvent them were identified. We anticipate that cure blowing may be an industrially relevant and environmentally friendly method for producing cross-linked polymeric nonwovens for a wide range of applications.
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U2 - 10.1021/acs.macromol.9b01002
DO - 10.1021/acs.macromol.9b01002
M3 - Conference contribution
AN - SCOPUS:85106144406
T3 - AIChE Annual Meeting, Conference Proceedings
SP - 6662
EP - 6672
BT - 2020 Virtual AIChE Annual Meeting
PB - American Institute of Chemical Engineers
T2 - 2020 AIChE Annual Meeting
Y2 - 16 November 2020 through 20 November 2020
ER -