兩性離子型水膠作為自養護劑之研究

陳瑩芝

指導教授 ： 許貫中

國立臺灣師範大學/理學院/化學系/碩士(2010年)

摘要

本論文為延續可敬學長的方法，製備一種兩性離子型的高吸水性水膠，使用丙烯醯胺和disodium 1-(4-(3-((carboxylatomethyl)dimethylammonio)propylamino)- 4-oxobut-2-enoate)(CDP)為單體，交聯劑為MBA，起始劑為APS聚合而成的poly(AAm-co-CDP)。使用FT-IR作結構鑑定，樣品表面孔洞透過電子顯微鏡觀察，影響反應的參數包括：單體比例、起始劑劑量、交聯劑劑量和反應溫度，接著浸泡到純水和鹽水中測其吸水率。接著評估PCA水膠加到水泥漿和水泥砂漿中作為自養護劑是否合宜，於水泥漿中探討其水化程度、圓盤裂縫和凝結時間；水泥砂漿中則探討水分重量損失、抗壓強度、內部濕度和乾縮量。
實驗結果顯示，當單體比例= 0.67 (mol/mol)，MBA劑量= 0.5 mol%，APS劑量= 1.3 mol%，反應溫度75℃，PCA水膠在純水中的吸水率為421（g/g），0.1M NaCl(aq) 和0.1M CaCl2(aq)的吸水率分別為46.4、40.2 （g/g）。將PCA水膠加入水泥砂漿中當自養護劑，最佳添加劑量為0.25wt%，對水泥砂漿試體的重量損失、抗壓強度、內部濕度和乾縮量與未添加水膠的控制組相比，均有提升效果。
接著在水泥漿中發現，添加水膠在初期會延緩水化程度，但後期則會使水泥水化更完整。在圓盤裂縫測試中，發現水膠添加能有效減少裂縫生成，但添加量過多卻會造成表面缺陷。添加水膠會使水泥漿提前初凝時間，延緩終凝時間。

關鍵字

兩性離子型 ； 水膠 ； 自養護劑 ； 砂漿 ； 吸水率

並列摘要

This main goal of thesis is contium how to prepare a zwitterionic superabsorbent hydrogel. Poly (AAm-co-CDP) is synthesized by acrylamide and disodium 1-(4-(3-((carboxylatomethyl) dimethylammonio)propylamino)-4-oxobut-2-enoate) (CDP) as monomer、MBA as crosslinker, and APS as initiator. Using FT-IR to identify structure,surface porosity is observed by TM-1000. The parameters what could be effected experiment are monomer ratio,initiator dosage, crosslinker dosage, and reaction temperature. Then
measure hydrogel water absorbency in water and saline solution. We estimate is it reasonable which using PCA hydrogel add into cement paste and mortar as self-curing reagent. Then we researched hydration degree,
cracking index, and setting time in cement paste. We calculated weight-loss, compressive strength, internal humidity, and drying shrinkage.
The result indicate that when in the optimum recipe, PCA hydrogel water absorbency is 420 g/g in water, in 0.1M NaCl(aq) is 46.4,and 40.2 g/g in 0.1M CaCl2(aq). When we add PCA hydrogel into mortar as self-curing reagent, the optimum dosage is 0.25 wt%, in this condition,improve performance in weight-loss, compressive strength, internal
humidity, and drying shrinkage are better than control group which not adding PCA hydrogel. In cement paste, add PCA hydrogel would retard hydration in initial stage, retard initial setting time, also reduce craking formation.

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