| 학회 |
한국고분자학회 |
| 학술대회 |
2022년 봄 (04/06 ~ 04/08, 대전컨벤션센터) |
| 권호 |
47권 1호 |
| 발표분야 |
Virtual Lightning Session |
| 제목 |
Molecular-weight-dependent Interplay of Inelastic Mechanisms in Cold Spray Deposition of Glassy Polymers |
| 초록 |
The solid-state consolidation of polymer feedstock powders in cold spray additive manufacturing occurs at ultra-high rates (UHR＞106 s-1). To investigate the influence of molecular weights (MWs) of glassy polymers on the unique UHR deposition mechanism, laser-induced projectile impact testing (LIPIT) is introduced. In LIPIT, 40 µm diameter polystyrene microparticles (PS-µPs) having different MWs (10, 20, 40, 100 kDa) are accelerated and collide with a stationary PS or silicon substrate. In the collision with the silicon substrate, PS-µPs demonstrate substantially less collision-induced fragmentation. While the brittle fragmentation and shattering of the PS-µPs are suppressed by increasing MW, the adhesion of the PS-µPs is observed only for the silicon substrate at collision velocities above 435 m/s (for 40 kDa) and 645 m/s (for 100 kDa). This implies that the adhesion of PS µPs is determined by two competing factors, UHR fracture strength of solid PS and dynamic viscosity of PS melts. *This research was sponsored by the U.S. DEVCOM Army Research Laboratory under the Cooperative Agreement No. W911NF-19-2-0152. |
| 저자 |
Anuraag Gangineri Padmanaban1, Tristan W. Bacha2, Jeeva Muthulingam2, Francis M. Haas2, Joseph F. Stanzione2, III2, Behrad Koohbor1, Jae-Hwang Lee
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| 소속 |
1Univ. of Massachusetts Amherst, 2Rowan Univ. |
| 키워드 |
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| E-Mail |
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