| DSC法研究水分对PMDI与淀粉及复合变性淀粉反应的影响 |
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| 引用本文： | 时君友,顾继友,王垚,涂怀刚.DSC法研究水分对PMDI与淀粉及复合变性淀粉反应的影响[J].高分子材料科学与工程,2009(8). |
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| 作者姓名： | 时君友 顾继友 王垚 涂怀刚 |
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| 作者单位： | 北华大学木材科学与工程系;清华大学化学工程系;东北林业大学材料科学与工程学院; |
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| 基金项目： | 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) |
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| 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。
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| 关 键 词： | 差示扫描量热 聚异氰酸酯 淀粉 复合变性淀粉 水 |
DSC Analysis of the Effect of Moisture on the Reactions of PMDI with the Starch and Modified Starch |
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| SHI Jun-you,GU Ji-you,WANG Yao,TU Huai-gang.DSC Analysis of the Effect of Moisture on the Reactions of PMDI with the Starch and Modified Starch[J].Polymer Materials Science & Engineering,2009(8). |
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| Authors: | SHI Jun-you GU Ji-you WANG Yao TU Huai-gang |
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| Affiliation: | SHI Jun-you1,2,GU Ji-you3,WANG Yao2,TU Huai-gang1(1.Department of Wood Science and Engineering,Beihua University,Jilin 132013,China,2.Department of Chemical Engineering,Tsinghua University,Beijing 100084,3.College of Material Science and Engineering,Northeast Forestry University,Harbin 150040,China) |
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| Abstract: | 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 highe... |
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| Keywords: | DSC PMDI starch modified starch moisture |
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