Solvent-Induced Crack and Crack Healing in Poly(Methyl Methacrylate)

有機溶劑在聚甲基丙基酸甲酯裡引發裂紋與裂紋癒合之行為研究

吳憲俊(Hsien-Chun Wu)

指導教授 ： 李三保

國立清華大學/工學院/材料科學工程學系/碩士(2009年)

https://doi.org/10.6843/NTHU.2009.00417

摘要

在過去的文獻裡，高分子擴散行為和溶劑在高分子內引發的硬力已經被深入研究。在這個實驗裡，我們利用重量、厚度與傅立葉紅外光轉換光譜（PMMA）發現2-己基乙醇可以快速的將甲醇從聚甲基丙基酸甲酯（PMMA）抽出，同時在PMMA表面產生裂紋。我們利用光學顯微鏡（OM）觀察在不同的實驗參數條件下對於裂紋的影響（如：溶劑的浸泡時間與浸泡溫度），不同的浸泡時間與浸泡溫度會造成不同的裂紋密度與深度。我們藉由拉伸試驗將裂紋對PMMA的破壞程度量化並且利用電腦軟體ImageJ計算裂紋密度與量測裂紋深度。
溶劑引發高分子裂縫癒合在過去也已經被廣泛的研究，在這個實驗當中我們也用甲醇使裂縫癒合並用拉伸試驗量化癒合的程度。我們發現PMMA可以癒合到近乎原始的強度。在本實驗最後的部份，我們會在甲醇癒合的部份加入染劑使裂縫癒合完後裂縫會有顏色。這個過程未來也許可以被應用於微顆粒在PMMA表面的嵌鑲。

關鍵字

裂縫 ； 2-乙基己醇 ； 甲醇 ； 溶劑引發應力 ； 聚甲基丙基酸甲酯

並列摘要

Diffusion in polymer and solvent-induced stresses has been well
investigated in the past. In this experiment, we found that 2-ethylhexyl alcohol
could rapidly extract methanol from PMMA by mass measurement, thickness
measurement and FTIR spectrum. Crack formed during methanol desorption.
We observed the crack growth with optical microscope (OM) and studied
different parameters affected crack growth like immersion tempersture and
immersion time. Different immersion times and immertion temperatures
carried out different crack densities and crack depths. We utilized tensile test
to quantify the extent of crack destruction on specimens and the software
ImageJ to calculate the crack density and crack depth.
Crack healing in PMMA with solvent has been proposed. We heals the
cracked specimen with methanl at different temperatures and utilized tensile
test to quantify the extent of crack healing. The healing rate increases with
increasing temperature. Finally. we used mixture of methanol with dye to heal
the cracked specimen which is possiblely applied for embedding particles in
polymer.

並列關鍵字

crack ； 2-ethylhexyl alcohol ； methanol ； solvent-induced stress ； PMMA

參考文獻

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