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A Novel Strategy for Poly(β-alanine-b-lactone)s: Sequentially HTP and AROP
Efkan Çatıker,Ayçanur Hamzaçebi 한국고분자학회 2022 Macromolecular Research Vol.30 No.5
A series of poly(β-alanine-b-lactone)s were prepared by combination of hydrogen-transfer polymerization (HTP) of acrylamide and anionic ring-opening polymerization (AROP) of β-propiolactone, α-methyl propiolactone, β-butyrolactone, and δ-valerolactone. Poly-β-alanine (PBA) having a living anionic end-group for a further extension was obtained via HTP of acrylamide. Then, the anionic endgroup on PBA chains was used as initiation sites for AROP of the lactones. By varying acrylamide feeds, a series of copolymers was obtained with a hard segment (β-alanine) content between 6.86 and 36.82 mol%. Elemental analyses and spectral data (MALDI-MS, 1H-NMR, and FT-IR) for all new products were consistent with the proposed structures.
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An experimental study on different socket base connections under cyclic loading
Selim Pul,Metin Hüsem,Mehmet Emin Arslan,Sertaç Hamzaçebi 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.13 No.3
This paper presents an experimental study on socket base connections of precast reinforced concrete columns. The main purpose of this study is to determine socket base connection which has the closest behavior to monolithic casted column-base joints. For this purpose, six specimens having different column-socket base connection details were tested under cyclic loading. For each test, strength, stiffness, ductility and drift ratios of the specimens were determined. Test results indicated that a suggested connection type is 10% - 30% stronger than the other type of connections under lateral loading. The welded connection (PC-5) had better lateral load carrying capacity and ductility. On the other hand, performance of standard connection (PC-1) which is commonly used in construction was weaker than other connections. Thus, decision of connection type should be referred not only performance but also applicability.
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