聚二氧杂环己酮合成可吸收缝合线体外降解研究

通过检测缝线的力学性能、分子量、失重、大分子取向和结晶度变化研究了聚二氧杂环己酮可吸收缝合线（ＰＤＳ）在体外的初期（４星期）降解过程。研究结果表明，本文工艺条件下研制的ＰＤＳ缝线在体外降解过程中随着分子量和大分子取向程度下降，力学性能明显下降，４星期时强度基本消失。分子量明显下降而失重变化很小的结果，证明ＰＤＳ缝线的酯水解在链中和链端等活性，水解的几率只与水分子的可及程度相关。ＷＡＸＤ和ＤＳＣ测试结果表明，随着体外降解进行，缝线原晶区基本保持不变，无定形区产生新的有序区，并且含量不断增加和完善。采用结晶高聚物微原纤结构模型解释ＰＤＳ缝线无定形区在水中的降解机理与研究结果相吻合。ＰＤＳ缝线的体外降解机理与聚羟基乙酸（ＰＧＡ）缝线基本相同     

聚对二氧环己酮医用可吸收缝合线纺丝工艺研究

以聚对二氧环己酮为原料熔融纺制缝合线,研究了纺丝工艺对缝线的性能影响,结果表明,在室温和80℃进行两次拉伸所得缝线力学性能比较理想;70～100℃进行定长热定型,可在非晶区形成明显的微晶结构;在理想的工艺条件下纺制的缝线力学性能达到美国药典第22版要求.     

聚对二氧杂环己酮─乙交酯无规共聚物缝合线热处理及体外降解性能研究

本文研究了热处理对聚对二氧杂环己酮-乙交酯无规共聚物合成缝合线力学性能和体外降解性能影响。结果表明：60～80℃温度范围内定长热定型对缝线原有力学性能影响较小；体外降解性能表明，随着热定型温度提高，缝线强度下降速率减缓。DSC测试结果表明，热定型后缝线样品结晶度提高，体外降解过程样品结晶度也逐渐提高，其中，无热定型样品提高幅度最大，说明热定型可使缝线样品聚集态结构紧密，水解速度减慢。     

Excel在实验工作量核算中的应用

本文介绍了采用微软Excel电子表格对实验工作量进行统计核算的思路和实施方案,阐述了其科学性、实用性,有利于提高工作效率.     

Shape Memory Polymers and Their Applications to Smart Textile Products

ＩｎｔｒｏｄｕｃｔｉｏｎＳｍａｒｔｐｒｏｄｕｃｔｓｗｉｌｌｂｅｔｈｅｆｕｔｕｒｅｆｏｒｈｉｇｈｌｙｄｅｖｅｌｏｐｅｄｓｏｃｉ ｅｔｉｅｓ.Ａｍｏｎｇｄｉｆｆｅｒｅｎｔｔｙｐｅｓｏｆｓｍａｒｔｍａｔｅｒｉａｌｓ,ｓｈａｐｅｍｅｍｏｒｙｇｒｏｕｐｓｉｎｃｌｕｄｉｎｇｓｈａｐｅ ｍｅｍｏｒｙａｌｌｏｙｓ,ｓｈａｐｅ ｍｅｍｏｒｙｃｅｒａｍｉｃｓａｎｄｓｈａｐｅ ｍｅｍｏｒｙｐｏｌｙｍｅｒｓｈａｖｅｒｅｃｅｉｖｅｄｓｏｍｅａｔｔｅｎｔｉｏｎ ,ｈａｄｖａｒｉｏｕｓａｐｐｌｉｃａｔｉｏｎｓａｎｄｓｔｉｌｌｈａｖｅ…     

RELATION BETWEEN DYNAMIC LOSS MODULUS AND DIFFUSION COEFFICIENT IN A MODIFIED PET FIBER*

The mobility of polymer chain segments is shown to play a major role in the diffusion ofdisperse dyes in a copolymerization modified PET system, monoepoxy compoundCH_3 (CH_3),OCH_2CH--CH_2 modified PET. The rate of dye diffusion (diffusion coefficient D) hasbeen related to the time-dependent mechanical property, dynamic loss modulus E", which iscontrolled by the mobility of chain segments. In this modified copolyester system, the variance ofamount of modifier in the copolyester fibers causes the change in disperse dye diffusion coefficientto fiber, and in the dynamic loss modulus of the fibers, but the relationship between the diffusionand the dynamic loss modulus is in agreement with the theoretical relation derived by Bell andDumbleton. The relation obtained in this paper is:Ln D=-2. 28Ln E"+26. 81     

智能节点组网研究

针对LonWorks现场总线技术特点,论述了利用智能节点,模拟工控现场进行组网。上位机选用LNS DDE Server和Lon总线设备进行通信;基于LNS的LonMaker for Windows网络集成工具将各网络变量捆绑,并负责管理整个网络;利用i.Lon 100e3和Contribute开发测控网络的控制界面。     

一步法合成大网等孔聚苯乙烯树脂

以低交联聚苯乙烯为原料,用少量氯甲醚在低温下首先进行氯甲基化反应。之后,在体系中补加催化剂、提高反应温度,通过自交联反应合成等孔树脂。该树脂具有高的比表面积,平均孔径小,在聚苯乙烯的良溶剂和非良溶剂中均有良好的溶胀性能。     

Synthetic Absorbable Surgical Sutures

This paper reviewed all types of the polymer - based synthetic absorbable surgical sutures that have been commercially produced. The chemical component, biological and mechanical properties, and using effect of these sutures were discussed. The recent development and the possible coming research orientation in these areas were also presented.