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Introduction Polyester diol is mainly used in the production of polyurethane products [1-5], such as thermoplastic polyurethane, polyurethane dope, polyurethane synthetic leather slurry and polyurethane foam materials and others.
Experimental Materials.
Journal of Applied Polymer Science Vol.71(1999),p.415~422 [3] Palanivelu K, Sivaraman P, Dasaratha Reddy M.
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The material permeability and iteration curve will be shown on screen.
Acknowledgements This work was financially supported by the National Science Foundation of China (61171003) and Beijing Municipal Natural Science Foundation (no 1102024).
Applied Mechanics and Materials.
Journal of Xianning College.
Chinese Journal of Radio Science.

Polycarbonate is one of the common 3D printing materials made from petroleum and non-biodegradable materials.
Materials and Methods Materials Preparation Polycarbonate (PC) materials in the form of plastic waste and commercial filament were used in this study.
Corcione, “A Review of Polymer-Based Materials for Fused Filament Fabrication (FFF): Focus on Sustainability and Recycled Materials,” Polymers, vol. 14, no. 3, 2022, doi: 10.3390/polym14030465
Tang et al., “Chondrocyte-laden GelMA hydrogel combined with 3D printed PLA scaffolds for auricle regeneration,” Materials Science and Engineering C, vol. 130, no.
Srinivasan et al., “3D Printing Manufacturing Techniques, Materials, and Applications: An Overview,” Advances in Materials Science and Engineering, vol. 2021, 2021, doi: 10.1155/2021/5756563

Especially with the development of materials science and technology, the use of metal materials in manufacturing PCB is decreasing while the nonmetal usage is increasing.
Zhang, Research progress on nonmetallic materials of waste printed circuit boards by pyrolysis (in Chinese), Journal of Anhui Construction Industry Institute (natural science edition), 20 (5) 2012: 76-81
Xing, The reuse of nonmetals recycled from waste printed circuit boards as reinforcing fillers in the polypropylene composites, Journal of Hazardous Materials, 163 (2009) 600–606
Li, Recovery of epoxy resin in waste printed circuit boards by solvent method, Journal of Kunming University of Science and Technology (Science and Technology), 35(4) 2010 85-88
Long , et al., Using Vacuum Pyrolysis and mechanical processing for recycling waste printed circuit boards, Journal of Hazardous Materials, , 177 (1-3) 2010 626-632

Vol.29 (2008) ,p.120 [3] Wu Bing,LIU Zhong-yin, Zhao Lin-du: Chinese Journal of Management Science.
Vol.16 (2008), p.91 [4] Wu Bing,LIU Zhong-yin: Journal of Tongji University(Natural Science).
Vol.37 (2009), p.1276 [5] Wang Jian-yu, FAN Zhi-ping,JIANG Yan-ping HU Guo-dong: Chinese Journal of Management Science.
Vol. 26（2006）,p.183 [8] Xumei Zhang, Nali Shen, Xiaoping Mao: Advanced Materials Research.
Vol.201-203(2011),p. 773 [9] Weijie Guo, Huan Qi, Qiujun Guo: Advanced Materials Research.

Many studying results show that the confined pressure have an important impact on compressive mechanical properties of brittle materials as rock and concrete[8,9].
It is easy to study the materials’ mechanical performance by the active confined pressure, but the device of active confined pressure is also relatively more complex.
Acknowledgment This work was financially supported by National Natural Science Foundation of China (51104123) and  Science and Technology Support Item of Sichuan (2011GZ0064).
[5] Kang Y A,Zhang J Y.Uniaxial Compressive behavior of open-cell and closed-cell aluminum foams.Materials Review,Vol.19 (2005), p.122-124.
(In Chinese) [7] Shi S Q,Kang J G,Sui S B.Experimental study of quasi-static and dynamic compressive property of close-cell aluminum foam.Rare Metal Materials and Engineering, 2011，40(2)：150-154.Vol.26 (2006), p.46-52.

Fig. 1 Two layered cylindrical electrode consisting of graphite and copper electrodes and conventional graphite materials.
[2] S Kumar1,R Singh, T P Singh, and B L Sethi, “Comparison of material transfer in electrical discharge machining of AISI H13 die steel”, Journal Mechanical Engineering Science, JMES1227 © IMechE 2009, Vol. 223 Part C [3] Han-Ming Chow, Lieh-Dai Yang, Ching-Tien Lin, Yuan-Feng Chen,”The used of SiC powder in water as dielectric for micro-slit EDM machining”, Journal of Materials Processing Technology, 2007
Henriques, “ Electrical discharge machining using simple and powder-mixed dielectric: The effect of the electrode area in the surface roughness and topography”, Journal of Materials Processing Technology, 200, 2008
[5] Xiaohai Li et al., "Research on surface modification Technique by EDM", Advanced Materials Research Vols. 154-155, 2011
[6] Yu-Lung Hwang, Chia-Lung Kuo, Shun-Fa Hwang, ‘The coating of TiC layer on the surface of nickel by electric discharge coating (EDC) with a multi-layer electrode”, Journal of Materials Processing Technology, 210, 2010

Introduction Metallic biomaterials such as titanium, Co-Cr-Mo and steel alloys are the common materials used for implants especially in dental and musculoskeletal fractures.
Raw materials were melted in a resistance furnace at 550oC and held for 5 min under argon gas atmosphere.
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Experimental Materials and Equipments.
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American Society for Testing and Materials, 100 Barr Harbor Dr., West Conshohocken,PA 19428, United States
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Rowell, in: Property enhanced Natural Fiber Composite Materials Based on Chemical Modification.( Science and Technology of Polymers and Advanced Materials; Edited by P.N.

But its intensity is far less than metal materials such as gray iron, thereby limiting its popularization and application.
Acknowledgements The work is supported by the National Natural Science Foundation of China (Grant No. 51175308) and the National Science and Technology Major Project of China (Grant No. 2012ZX04010032).
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