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基于再生对苯二甲酸二甲酯制备阻燃聚酯纤维
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作者 吕维扬 刘志阳 +4 位作者 官军 陈林江 孙亚龙 王秀华 姚玉元 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2024年第2期20-31,共12页
文中以再生对苯二甲酸二甲酯(r-DMT)和乙二醇(EG)为原料、以2-羧乙基苯基次磷酸(CEPPA)为阻燃剂,采取共聚合的策略合成了阻燃再生聚对苯二甲酸乙二醇酯(rFR-PET)切片,并通过熔融纺丝技术制备了83 dtex/36 f规格的阻燃再生聚酯纤维。研... 文中以再生对苯二甲酸二甲酯(r-DMT)和乙二醇(EG)为原料、以2-羧乙基苯基次磷酸(CEPPA)为阻燃剂,采取共聚合的策略合成了阻燃再生聚对苯二甲酸乙二醇酯(rFR-PET)切片,并通过熔融纺丝技术制备了83 dtex/36 f规格的阻燃再生聚酯纤维。研究发现,CEPPA的引入使得聚酯的缩聚变得困难,阻燃再生PET相较于未改性的再生PET端羧基含量增大、二甘醇含量降低、亮度L值下降、黄蓝色度b值增大、热稳定性和结晶性下降。通过极限氧指数(LOI)测试和垂直燃烧性能(UL-94)分析得知,再生PET经阻燃改性后,LOI值由22.1%提高至32.7%,UL-94垂直燃烧等级从V-2级提升至V-0级,阻燃性能大幅提升。阻燃再生PET切片可纺性优异,通过熔融纺丝工艺制备的纤维具有良好的力学性能。为利用r-DMT开发下游高值化再生聚酯材料提供了有益参考。 展开更多
关键词 废旧聚酯纺织品 乙二醇醇解 甲醇酯交换 再生对苯二甲酸二甲酯 阻燃再生聚酯纤维
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Review on the Fabrication of Surface Functional Structures for Enhancing Bioactivity of Titanium and Titanium Alloy Implants
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作者 Heng Tang Jiaxiang Xu +4 位作者 Bin Guo Yansong Xie yalong sun Yanjun Lu Yong Tang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS 2024年第4期23-49,共27页
Titanium and its alloys have been widely applied in many biomedical fields because of its excellent mechanical properties,corrosion resistance and good biocompatibility.However,problems such as rejection,shedding and ... Titanium and its alloys have been widely applied in many biomedical fields because of its excellent mechanical properties,corrosion resistance and good biocompatibility.However,problems such as rejection,shedding and infection will occur after titanium alloy implantation due to the low biological activity of titanium alloy surface.The structures with specific functions,which can enhance osseointegration and antibacterial properties,are fabricated on the surface of titanium implants to improve the biological activity between the titanium implants and human tissues.This paper presents a comprehensive review of recent developments and applications of surface functional structure in titanium and titanium alloy implants.The applications of surface functional structure on different titanium and titanium alloy implants are introduced,and their manufacturing technologies are summarized and compared.Furthermore,the fabrication of various surface functional structures used for titanium and titanium alloy implants is reviewed and analyzed in detail.Finally,the challenges affecting the development of surface functional structures applied in titanium and titanium alloy implants are outlined,and recommendations for future research are presented. 展开更多
关键词 Surface functional structure Titanium implant Manufacturing technology Bioactivity
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