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ASTM F2450-2018 组织工程医用产品用聚合物支架微观结构的评定指南 Standard Guide for Assessing Microstructure of Polymeric Scaffolds for Use in Tissue-Engineered Medical Products
<div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.1</span> This guide covers an overview of test methods that may be used to obtain information relating to the dimensions of pores, the pore size distribution, the degree of porosity, interconnectivity, and measures of permeability for porous materials used as polymeric scaffolds in the development and manufacture of tissue-engineered medical products (TEMPs). This information is key to optimizing the structure for a particular application, developing robust manufacturing routes, and providing reliable quality control data.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.2</span> The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p></div> <div class="SectionLevel2"> <p class="caveat cdone2"><span class="Head3 cdone">1.3</span> <i>This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.</i></p></div> <div class="SectionLevel2"> <p class="WTOcaveat cdone2"><span class="Head3 cdone">1.4</span> <i>This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.</i></p></div>...
2023-07-21 13:00:01浏览：50
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添加剂对熔纺氨纶结构与性能的影响
基于添加剂与聚氨酯之间的化学与物理作用,选择了合适的聚合物和无机纳米颗粒等添加剂,研究了这些添加剂对熔纺氨纶制备及其对氨纶丝的微观结构和力学等物理性能的影响.研究结果表明:增塑剂S改善了氨纶的结晶特性,进而改善力学性能与热稳定性;添加剂的并用在一定程度上可改善氨纶丝弹性与耐疲劳性....
2020-12-09 22:57:44浏览：113
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振动塑化挤出对聚烯烃片材性能的影响
利用塑料电磁塑化挤出机挤出聚烯烃片材,系统研究了挤出机螺杆轴向振动对聚乙烯挤出制品结构与性能的影响.采用DSC对挤出试样的结晶结构及形态进行分析.结果表明,振动塑化挤出使聚合物挤出试样结晶度提高,结晶完善,晶片之间的连接分子数量增加,因而制品的力学性能有所提高,特别在横向上表现明显.在适当的振动条件下,高密度聚乙烯(HDPE)试样的横向拉伸强度和冲击强度分别从22.68 MPa和12.7 kJ/m2提高到了25.55 MPa和23.5 kJ/m2;而聚丙烯(PP)试样横向拉伸强度和冲击强度则分别提高了20%和64%....
2020-07-13 09:55:48浏览：77
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