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- 저자 : Shaojun Zhu (검색결과 5 건)
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Liang Shaojun,Zhang Manhong,Zhu Hanming,Yue Song 한국물리학회 2023 Current Applied Physics Vol.49 No.-
Energy filtering effect has been demonstrated an effective strategy to enhance the electrical transport properties and reduce the thermal conductivity of thermoelectric materials. However, to realize the energy filtering effect is so challenging, needing delicate design for specific system, which requires appropriate nano inclusions to well disperse in the pristine matrix and proper interface to produce potential energy barrier. Herein, we report a possible strategy to magnify the energy filtering effect in Cu-doped p-type CuxBi0.5Sb1.5Te3 films prepared by intermittent magnetron co-sputtering technique. Due to the simultaneous optimization of the electrical conductivity and Seebeck coefficient with appreciable magnitude, the power factor shows a 564% enhancement for x = 0.015 in comparison with that of the undoped film. This enhancement is presumably due to a modulable energy filtering effect in the sandwich-structured film system, which provides a potential application for other thermoelectric materials.
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Large-scale microwave-assisted ring-opening polymerization of e-caprolactone
Qi Xu,Chuanjie Zhang,Shaojun Cai,Lijian Liu,Ping Zhu 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.5
To probe into the industrialization possibility of microwave-assisted ring-opening polymerization (ROP)of e-caprolactone (e-CL), it was performed with monomer mass from 750 to 2450 g using a self-designed industrial microwave oven (6000W) catalyzed by stannous octanoate (Sn(Oct)2) (M/Cat = 1000). The large-scale ROP of e-CL proceeded smoothly at various microwave power levels (850, 1700, and 2550 W)and produced poly(e-caprolactone) (PCL) with weight-average molar mass (Mw) from 66,000 to 12,2000 g/mol within 40 min in a yield over 93%. The structure of PCL was characterized by 1H and 13C NMR, FT-IR, DSC and WAXD. We propose that the microwave ROP of e-CL is a potential technology to prepare PCL commercially. 2010 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
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Tunable Shape Memory Polyurethane Networks Cross-Linked by 1,3,5,7-Tetrahydroxyadamantane
Shuqin Fu,Jiaping Zhu,Shaojun Chen 한국고분자학회 2018 Macromolecular Research Vol.26 No.11
As a new type of smart polymers, the shape memory polyurethanes attract increasing attention because of their wide use in various applications. Herein, a serials of novel thermo-responsive shape memory polyurethane networks were developed by chemical cross-linking of polycaprolactone with 1,3,5,7-tetrahydroxyadamantane. The polyurethane networks were characterized in relation to their microstructure, cross-linking density, surface appearance, thermal properties, static and dynamic mechanical properties, and shape memory behavior. It was found that the prepared polyurethane networks can exhibit excellent thermo-responsive shape memory properties at body temperature by controlling the molar ratio of 1,3,5,7- tetrahydroxyadamantane and polycaprolactone. Moreover, the incorporation of 1,3,5,7-tetrahydroxyadamantane substantially improved the mechanical properties of the final polyurethane networks. The versatility of the synthesized polyurethane networks is reflected by its dual- and triple-shape memory performance. It can be anticipated that the synthesized polyurethane networks could be used as smart materials for applications involving shape memory polymers.
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Experimental studies on behaviour of tubular T-joints reinforced with grouted sleeve
Shou-Chao Jiang,Xiaonong Guo,Zhe Xiong,Yufang Cai,Shaojun Zhu 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.5
Tubular joints have been widely used in offshore platforms and space structures due to their merits such as easy fabrication, aesthetic appearance and better static strength. For existing tubular joints, a grouted sleeve reinforced method was proposed in this paper. Experimental tests on five tubular T-joints reinforced with the grouted sleeve and two conventional tubular T-joints were conducted to investigate their mechanical behaviour. A constant axial compressive force was applied to the chord end to simulate the compressive state of the chord member during the tests. Then an axial compressive force was applied to the top end of the brace member until the collapse of the joint specimens occurred. The parameters investigated herein were the grout thickness, the sleeve length coefficient and the sleeve construction method. The failure mode, ultimate load, initial stiffness and deformability of these joint specimens were discussed. It was found that: (1) The grouted sleeve could change the failure mode of tubular T-joints. (2) The grouted sleeve was observed to provide strength enhancement up to 154.3%~172.7% for the corresponding un-reinforced joint. (3) The initial stiffness and deformability were also greatly improved by the grouted sleeve. (4) The sleeve length coefficient was a key parameter for the improved effect of the grouted sleeve reinforced method.
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