Determination of polymer chain orientation in 3D printed filaments using Polarized Raman spectroscopy and Birefringence
ORAL
Abstract
To study orientation and alignment of molecular chains in 3D printed polycarbonate filaments, we used a combination of polarized Raman spectroscopy and birefringence measurements. By changing the orientation of the sample with respect to polarization of incident radiation, we probe changes in the ratio between orientation-dependent vibration modes and orientation-independent modes. Raman measurements show that in 3D printed filaments, little to no orientation at the monomer level was detected, supporting molecular dynamics simulation results [1]. Birefringence measurements were compared to the intrinsic birefringence of 0.2, to estimate the degree of orientation. Measured values of birefringence suggest minimal orientation in agreement with the results of Raman measurements. 3D printed filaments were pulled at different draw ratios after annealing to estimate the limit of Raman measurements’ sensitivity to chain orientation in 3D printed fibers through comparison with birefringence measurements.
References [1] Private communications with Marco Galvani and Mark Robbins
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Presenters
Nora Hassan
National Institute of Standards and Technology (NIST), National Institute of Standards and Technology
Authors
Nora Hassan
National Institute of Standards and Technology (NIST), National Institute of Standards and Technology
Jonathan Seppala
National Institute of Standards and Technology, National Institute of Standards and Technology (NIST)
Anthony Kotula
National Institute of Standards and Technology, National Institute of Standards and Technology (NIST), National Institute for Standards and Technology
Angela Hight Walker
National Institute of Standards and Technology, NIST, National Institute of Standards and Technology (NIST)
Kalman Migler
National Institute of Standards and Technology, National Institute of Standards and Technology (NIST)
