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</div> <div class="container"> <div class="row"> <div class="col-md-9"> <div class="mcon"> <div class="dqwz"><b>當前位置：</b><a href="http://www.elipsiss.com/">首頁</a>><a href="http://www.elipsiss.com/jishu/">技術百科</a>> 正文</div> <h1>聚丙烯酰胺水解變慢的原因有哪些</h1> <div class="info" id="artinfo">發布時間：<span>2022-02-21</span> </div> <p> <span style="font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", Tahoma, Arial, sans-serif; font-size: 14px;"><p> </p><p>聚丙烯酰胺是一種水溶性高分子線型聚合物或聚電解質，由于其分子鏈中含有一定數量的極性基團，可吸附水中懸浮的固體粒子，或通過電荷中和作用在粒子架橋或凝聚形成大的絮凝體。因此，聚丙烯酰胺可以加速懸浮液中顆粒的沉降，明顯加速溶液的澄清，具有促進過濾效果。聚丙烯酰胺水解是指聚丙烯酰胺水解過程中分子中酰胺基轉化為羧基的百分比，羧基值很難確定。因此在實際應用中，通常采用水解時氫氧化鈉的用量與聚丙烯酰胺的重量比來測量，這通常被稱為“水解比”。那么聚丙烯酰胺水解變慢的原因有哪些？接下來元成凈水詳細為大家解答這個問題。</p><p style="text-align:center"></p><p>1、分子擴散</p><p>物質的溶解過程是溶質分子在尺寸上遠大于溶劑分子，因此兩者的擴散速率有很大的不同。在溶解初期，實際上只有水分子單方面向聚丙烯酰胺擴散，而聚丙烯酰胺的分子不能向水的方向擴散，所以溶脹是溶解的必要階段。</p><p>2、氫鍵與纏結</p><p>在聚丙烯酰胺分子鏈中，酰胺側基之間可以形成氫鍵。氫鍵是一種很強的分子間作用力，高分子量聚丙烯酰胺分子鏈上有大量的氫鍵，同時高分子量聚丙烯酰胺分子鏈很長，達到一定長度后必然卷曲，聚集在一起也必然纏結在一起。因此，聚丙烯酰胺的加速溶解依賴于溶劑水分子的快速滲透、氫鍵的解離和分子鏈的解纏結。進口聚丙烯酰胺的溶解速率與分子量、離子度、分子幾何結構、溶解溫度、攪拌方式和投料方式有關。</p><p>聚丙烯酰胺溶液的粘度隨水解時間的延長而變化。水解時間短，粘度小，這可能是由于聚合物沒有時間形成網狀結構；水解時間過長，粘度降低，這是由于溶液中聚丙烯酰胺的結構疏松所致。部分水解的聚丙烯酰胺溶于水后，分解成帶負電荷的大分子。分子間的靜電斥力和同一分子上不同鏈間的負離子斥力使分子在溶液中拉伸并相互纏繞，這就是部分水解聚丙烯酰胺能顯著提高溶液粘度的原因。</p><p> </p></span></p> <div class="prenext"> <div class="yunu-infocontent-return"> 本文標簽：</div> <span class="pre"><b>上一篇：</b><a href='http://www.elipsiss.com/jishu/779.html'>洗沙藥劑價格是多少？</a></span> <span class="next"><b>下一篇：</b><a href='http://www.elipsiss.com/jishu/781.html'>陰離子聚丙烯酰胺使用常見問題</a></span> <div class="clearfix"></div> </div> <div class="clearfix"></div> <div class="row nynew"> <div class="col-md-6"> <div class="news"> <div class="sytit"> 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