期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
跟腱自体修复材料的生物力学评价 被引量:10
1
作者 朱青安 李汉云 +2 位作者 钟世镇 李忠华 蔡锦方 《中国临床解剖学杂志》 CSCD 北大核心 1991年第4期238-240,共3页
本文在8具防腐固定的成人标本上,切取跟腱和临床上常用来修复断裂跟腱的腹直肌前鞘,(足母)展肌肌腱和髂胫束等材料,进行单向拉伸破坏试验。试验结果表明:跟腱和(足母)展肌肌腱的最大拉伸力分别为210.6±26.5kg 和64.8±6.8kg:... 本文在8具防腐固定的成人标本上,切取跟腱和临床上常用来修复断裂跟腱的腹直肌前鞘,(足母)展肌肌腱和髂胫束等材料,进行单向拉伸破坏试验。试验结果表明:跟腱和(足母)展肌肌腱的最大拉伸力分别为210.6±26.5kg 和64.8±6.8kg:宽度为1cm 的髂胫束和横向腹直肌前鞘的最大拉伸力分别为29.5±7.6Kg 和10.1±3.8kg。按人体单足足尖站立时跟腱承受的拉力为1.2倍体重,本文给出了修复材料的应用条件。另外,横向腹直肌前鞘的最大拉伸力为身长方向的5倍多,故采用腹直肌前鞘修复跟腱时应沿横向取材。 展开更多
关键词 跟腱 自体修复材料 生物力学
下载PDF
A robust self-healing polyurethane elastomer: From H-bonds and stacking interactions to well-defined microphase morphology 被引量:11
2
作者 Cheng-Jie Fan Zi-Chun Huang +4 位作者 Bei Li Wen-Xia Xiao En Zheng Ke-Ke Yang Yu-Zhong Wang 《Science China Materials》 SCIE EI CSCD 2019年第8期1188-1198,共11页
Self-healing materials have attracted considerable attention because of their improved safety, lifetime, energy efficiency and environmental impact. Supramolecular interactions have been extensively considered in the ... Self-healing materials have attracted considerable attention because of their improved safety, lifetime, energy efficiency and environmental impact. Supramolecular interactions have been extensively considered in the field of self-healing materials due to their excellent reversibility and sensitive responsiveness to environmental stimuli. However,development of a polymeric material with good mechanical performance as well as self-healing capacity is very challenging. In this study, we report a robust self-healing polyurethane(PU) elastomer polypropylene glycol-2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol(PPG-mUPy) by integrating ureidopyrimidone(UPy) motifs with a PPG segment with a well-defined architecture and microphase morphology.To balance the self-healing capacity and mechanical performance, a thermal-triggered switch of H-bonding is introduced. The quadruple H-bonded UPy dimeric moieties in the backbone induce phase separation to form a hard domain as well as enable further aggregation into microcrystals by virtue of the stacking interactions, which are stable in ambient temperature. This feature endows the PU with high mechanical strength. Meanwhile, a high healing efficiency can be realized, when the reversibility of the H-bond was unlocked from the stacking at higher temperature. An optimized sample PPG1000-mUPy50%with a good balance of mechanical performance(20.62 MPa of tensile strength) and healing efficiency(93% in tensile strength) was achieved. This strategy will provide a new idea for developing robust self-healing polymers. 展开更多
关键词 POLYURETHANE H-BONDS stacking interaction microphase morphology SELF-HEALING
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部