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class="more_img" style="overflow: hidden;"> <p> 河南錦仙河廠家聚丙烯酰胺是由自由基引發的丙烯酰胺（AM）單體聚合而成的水溶性線性聚合物。具有良好的絮凝性，能降低液體間的摩擦阻力，按離子特性可分為非離子型、陰離子型、陽離子型和兩性型四種。聚丙烯酰胺會水解，聚丙烯酰胺（PAM）不溶于大多數有機溶劑，如甲醇、乙醇、丙酮、乙醚、脂肪烴和芳香烴，除了少數極性有機溶劑，如乙酸、丙烯酸、氯乙酸、乙二醇、甘油, 熔化尿素和甲酰胺。但這些有機溶劑溶解度有限，往往需要加熱，否則應用價值不大。能以任何比例溶于水，水溶液為均勻透明液體。分子量的大小對溶解度影響不大，但當溶液濃度高于10%時，由于分子間氫原子鍵合，高分子量聚合物可呈現凝膠狀結構。高分子量溶液是假塑性流體。 <br/></p><p> 聚丙烯酰胺會水解在合適的低濃度下，聚丙烯酰胺溶液可視為網絡結構，鏈間的機械纏結和氫鍵形成網絡節點；當濃度較高時，溶液中含有許多鏈節觸點使 PAM 溶液呈凝膠狀。 PAM水溶液與許多水溶性有機物相容性好，與電解質相容性好，與氯化銨、硫酸鈣、硫酸銅、氫氧化鉀、碳酸鈉、硼酸鈉、硝酸有良好的相容性。鈉、磷酸鈉、硫酸鈉、氯化鋅、硼酸和磷酸不敏感。<br/></p><p> 聚丙烯酰胺為白色粉末或小顆粒狀物質，密度為1.302g/cm3（23℃），玻璃化轉變溫度為153℃，軟化溫度為210℃[1]。一般的干燥方法都含有少量水分。它會迅速吸收環境中的水分。凍干分離的均聚物為白色柔軟的無定形固體，但從溶液中析出并干燥后后者是一種玻璃狀的部分透明固體。完全干燥的聚丙烯酰胺 PAM 是一種易碎的白色固體。商用聚丙烯酰胺通常在中等條件下干燥，一般含水量為5%～15%，澆鑄在玻璃上。板上制備的聚合物薄膜是一種透明、堅硬、易碎的固體。 <br/></p><p> 在缺氧條件下，加熱到210℃會因失水而失重；繼續加熱至210~300℃時，酰胺基分解生成氨和水；當溫度升至500℃時，僅形成原重量40%的黑色薄片。<br/></p><p> 聚丙烯酰胺的酸水解：在酸性條件下，PAM的水解速率隨著溫度的升高和pH值的降低而增加（注：酸可以加強PAM的水解，但在酸性條件下，PAM的水解速率更堿性）水解速度較慢，因此往往需要在較高溫度下進行，在酸性條件下，水與質子化的酰胺羰基發生親核加成，然后脫去氨（NH3），丙烯酰胺結構單元水解成丙烯酸結構單元。）。隨著水解的進行，其水溶液的粘度和pH值會發生變化。當沒有緩沖劑的反應溶液的pH值小于8時，水解產生的氨會增加溶液的pH值和粘度。但光散射數據研究表明，PAM的鏈長在水解過程中基本保持不變。因此，粘度的變化是由于水解引起的PAM鏈的構象變化。 PAM的酸性水解表現出顯著的近端催化作用，即水解后生成的羧基加速了近端酰胺基的水解。這導致酸水解的速率隨著水解程度的增加而加快。丙烯酰胺-丙烯酸共聚物或水解聚丙烯酰胺的水解速度明顯快于丙烯酰胺均聚物。<br/><br/></p> </dd> </dl> <div class="page_c"> <a title="聚丙烯酰胺酸" href="http://www.yashikanews.com/a/jbxxas4551.html">上一篇：聚丙烯酰胺酸</a> <a title="離子聚丙烯酰胺" href="http://www.yashikanews.com/a/lzjbxxa.html">下一篇：離子聚丙烯酰胺</a> </div> </div> </div> <div class="rel_list"> <div class="rel_list_title">相關新聞</div> <ul> <li> <a href="http://www.yashikanews.com/a/scjbxxa4576.html" title="雙叉聚丙烯酰胺"> 雙叉聚丙烯酰胺 </a> <samp class="n_time">09-05</samp></li><li> <a href="http://www.yashikanews.com/a/jbxxafc-fr.html" title=" 聚丙烯酰胺防潮、防熱"> 聚丙烯酰胺防潮、防熱 </a> <samp class="n_time">09-05</samp></li><li> <a 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