應力引發聚二甲基矽氧烷微波紋成型及機制

Formation and Mechanisms for Stress Induced Micropatterns of Polydimethysiloxane

林金龍(Daniel Lin)

指導教授 ： 林清彬

淡江大學/工學院/機械與機電工程學系碩士班/碩士(2007年)

https://doi.org/10.6846/TKU.2007.00118

摘要

為了更進一步了解彈性體與鍍金層間因楊氏係數不同所引發微波紋成型機制，本實驗將金濺鍍於彈性體PDMS上後隨及覆蓋第三層彈性體PDMS加熱後，釋放所殘留的應力，並透過第三層PDMS厚度的改變來控制所施加應力，當所施加應力超過臨界應力(τcpg)時，波紋開始轉向。此外，改變第三層薄膜材料為聚醋酸乙烯樹脂，透過剝離的機械應力製造鍍金層破裂面，釋放殘留應力後破裂面受推擠，成功製造出類金字塔微波紋。類差排運動機制及微波紋間應力的相互干擾乃藉由對具漣漪波紋的單層PDMS鍍金薄膜施加不同角度拉伸應力得著印證，當78°＜θ°≤101°時，兩方向應力相互重疊，因挫曲形成之波峰與波谷相互消長，形成類網狀波紋，波紋運動皆以網格點為基本單位，且並無類差排運動的跡象。當0°＜θ°≤77°及102°＜θ°≤180°時，漣漪波紋因收縮應力方向改變而開始產生類差排運動，隨著拉伸應力的增加波紋會發生兩次以上的暫穩態(波紋大規模具週期性)，最後形成漣漪波紋，此過程中所形成的人字形波紋之夾角比78°＜θ°≤101°時還小。由此運動的觀測可知，類差排因收縮應力方向改變而開始運動形成Y差排。

關鍵字

挫曲 ； 聚二甲基矽氧烷 ； 類差排運動 ； 彈性體 ； 微波紋 ； 類網狀波紋 ； 三腳波紋

並列摘要

This paper describes a novel method to the formation of micro-patterns induced by the stretched PDMS thin film with a sputtered gold layer. The Young’s Module and coefficient of heat expansion of PDMS differed from those of Au so that the instability of stress induced the buckling on the surface of elastomer. In this thesis, the pyramid-like patterns, movement of dislocation-like, and net-like patterns are discovered by changing the method of applying force. Coating a third layer of PDMS with different thickness supplied the contracting stress and found out the contribution of stress in the third layer. The third layer was also replaced by polyvinyl acetate adhesive for it is ablated easily. After that, the fracture surfaces were shown and pyramid-like patterns appeared with the fracture surfaces shoved by the released the stress. Apparently, the degree of second axial force we applied on PDMS influences the movement of patterns very much. As 78°＜θ°≤101°, the net-like patterns appeared owing to the overlaps of biaxial compressive forces, and none of movement of dislocation-like existed. Besides, the movement of net-like patterns was based on the unit of grid points. As 0°＜θ°≤77°and 102°＜θ°≤180°, the change of contracting force resulted in the movement of dislocation-like. There were more than two times of temporary stable states during the stress increased. The reason for the formation of Y dislocation was also confirmed.

並列關鍵字

Ripple ； Tensile stress ； net-like patterns ； Elastomer ； Buckle ； star light patterns ； PDMS ； movement of dislocation-like

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