DSC法研究水分对PMDI与淀粉及复合变性淀粉反应的影响  

DSC Analysis of the Effect of Moisture on the Reactions of PMDI with the Starch and Modified Starch

作　　者：时君友[1,2] 顾继友[3] 王垚[2] 涂怀刚[1] 

机构地区：[1]北华大学木材科学与工程系,吉林吉林132013 [2]清华大学化学工程系,北京100084 [3]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《高分子材料科学与工程》2009年第8期106-109,共4页Polymer Materials Science & Engineering

基　　金：科技部农业转化资金项目(2007GB2B10078);吉林省科技发展计划重点项日(20060401-2);国家重点基础研究项目(973计划2004CB719706)

摘　　要：采用差示扫描量热(DSC)法研究水分对聚异氰酸酯(PMDI)与淀粉、复合变性淀粉反应的影响,测定了其化学反应动力学参数。研究发现,在相同的水分条件下,复合变性淀粉比原淀粉表现出更高的反应活性;随着淀粉试样中水分增加,PMDI消耗的比例逐渐增加,且增加幅度比较明显;在相同的升温速率下,随着水分增加,PMDI与淀粉、复合变性淀粉的最高转化率温度(峰谷温度)逐渐升高。该结果为进一步确定淀粉基水性异氰酸酯木材胶粘剂的热压工艺提供了科学依据。The effect of moisture on the reactions of polymeric diphenylmethane diisocyanate（PMDI） to the starch and the modified starch was investigated by differential scanning calorimetry（DSC） and the dynamic parameters were determined. The results indicate that the reactivity of the modified starch is higher than that of the starch at the same moisture content. The reaction rate of PMDI obviously increases as increasing the moisture content （MC） of the samples. And at the same heating rate, the temperature of the highest conversion （peak temperature） of PMDI reacted with starch and compound modified starch gradually increases with increasing the MC. Those results offers the scientific basis for further fixing the hot-pressing process of starch-based aqueous polymer isoeyanate wood adhesive.

关 键 词：差示扫描量热 聚异氰酸酯 淀粉 复合变性淀粉 水 

分 类 号：O657.99[理学—分析化学]