El-Farahaty K A, El-Bakary M A, El-Sayed N M
Physics Department, Mansoura University, 35516, Egypt.
Microsc Res Tech. 2018 Jan;81(1):64-73. doi: 10.1002/jemt.22957. Epub 2017 Oct 13.
Samples of polyglycolic acid PGA/polycaprolactone PCL copolymer absorbable suture materials, which is called Poliglecaprone PGC copolymer suture, were thermally treated by two different processes. The first method is the direct heat exposure, from 20 to 38 °C, in the surrounding medium. Which is an environmental study. The other method is the annealing process at temperatures ranged from 65, 80, 100, 120, and 140 °C, for two different duration periods 60 and 120 min. This is an extensive technical study. The refractive indices of thermally treated PGA/PCL copolymer sutures were measured using multiple-beam Fizeau fringes. The birefringence profiles across the suture cross-sections were studied for different annealing conditions. The effect of heat on the polarizabilty per unit volume, dielectric properties, and suture diameter were investigated. The activation energy for the heating processes was calculated using Arrhenius equation. Microinterferograms are given for illustration.
聚乙醇酸（PGA）/聚己内酯（PCL）共聚物可吸收缝合材料的样本，即聚乙丙交酯（PGC）共聚物缝合线，通过两种不同的工艺进行了热处理。第一种方法是在周围介质中从20℃直接加热至38℃，这是一项环境研究。另一种方法是在65℃、80℃、100℃、120℃和140℃的温度下进行退火处理，持续两个不同的时间段，即60分钟和120分钟。这是一项广泛的技术研究。使用多光束菲佐条纹测量了热处理后的PGA/PCL共聚物缝合线的折射率。研究了不同退火条件下缝合线横截面的双折射分布。研究了热对单位体积极化率、介电性能和缝合线直径的影响。使用阿伦尼乌斯方程计算了加热过程的活化能。给出了微观干涉图以作说明。
