Effect of PCL chain length on rheological and mechanical properties of PCL‐PDMS‐PCL triblock copolymer films,Journal of Applied Polymer Science

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Effect of PCL chain length on rheological and mechanical properties of PCL‐PDMS‐PCL triblock copolymer films
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-04-10 , DOI: 10.1002/app.55542
Radha Sachan _{1,

2} , Roli Purwar ₁

Affiliation

The polycaprolactone‐polydimethylsiloxane‐polycaprolactone (PCL‐PDMS‐PCL) triblock copolymer films of variable PCL chain are analyzed for rheological characteristics in this paper. The dynamics of viscoelastic behavior of photocrosslinked films above their crystal melting temperature (Tcm) is measured using oscillatory shear rheology experiments. The frequency sweep tests are analyzed at 0.1% strain as obtained from linear viscoelastic region. Shear thinning is observed in the study of complex viscosity. It has been noted that viscosity rises with increase in crosslink density and decrease in with PCL chain length. Time‐dependent effect on the copolymer films has been analyzed by creep recovery behavior. The Burgers model is fitted in creep compliance data to analyze its viscoelastic and viscous region. An examination of structure recovery revealed that recovery increased as PCL chain length decreased. Tensile strength and percentage elongation are studied at ambient conditions with a universal testing machine, while storage modulus and tan δ are analyzed by a dynamic mechanical analyzer at varying temperatures.

中文翻译：

PCL链长对PCL-PDMS-PCL三嵌段共聚物薄膜流变学和力学性能的影响

本文分析了可变PCL链的聚己内酯-聚二甲基硅氧烷-聚己内酯(PCL-PDMS-PCL)三嵌段共聚物薄膜的流变特性。光交联薄膜在晶体熔化温度以上的粘弹性行为动力学（时间厘米）是使用振荡剪切流变学实验测量的。频率扫描测试是在从线性粘弹性区域获得的 0.1% 应变下进行分析的。在复数粘度的研究中观察到剪切稀化。值得注意的是，粘度随着交联密度的增加而增加，并随着 PCL 链长度的增加而减少。通过蠕变恢复行为分析了对共聚物薄膜的时间依赖性影响。 Burgers 模型适合蠕变柔量数据，以分析其粘弹性和粘性区域。结构恢复的检查表明，恢复随着 PCL 链长度的减少而增加。在环境条件下使用万能试验机研究拉伸强度和伸长率，同时研究储能模量和正切δ通过动态机械分析仪在不同温度下进行分析。

更新日期：2024-04-10

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