Relationship between the structure and thermophysical property of a starch-synthetic polymer composite under heated and pressurized conditions

使用农业衍生产品如淀粉和全合成聚合物的替代品减少了我们对石油化学衍生单体的依赖，并且由于这些植物衍生材料的生物降解性，目前是一个活跃的研究领域。重要的是获得基本数据如热物理性质，用于设计和优化生产此类材料的设备。在加热和加压条件下测量淀粉-合成聚合物复合材料的热导率，并得到以下结论：1）测量材料热导率的探针的开发已经开发了用于在加热（-150 ℃）和加压（-20MPa）条件下测量食品材料热导率的探针，2）淀粉凝胶导热系数的测量通过对实验数据的分析，验证了该探头测量数据的有效性 关于我们 与公开的水的数据相比，在25-80 ℃、50- 80%水分和0.2-10 MPa下测定糊化马铃薯淀粉的热导率。结果发现，淀粉凝胶的热导率随温度和水分含量的增加，并且它随压力增加到IMPa，在此之上它几乎保持恒定。压力依赖性可以通过考虑在制备过程中可能已经渗透到样品中的截留的细小气泡的存在来证明。3）淀粉-合成聚合物复合物的热导率测量淀粉-接枝-聚的热导率在20-80 ℃下测定了硝酸铈铵引发甲基丙烯酸酯在颗粒玉米淀粉上的聚合反应，含水量7- 35%，压力0.2-8 MPa。结果发现，导热系数随温度和水分含量的增加，虽然温度依赖性是如此之小。此外，由于与2）相同的原因，热导率随着压力而增加。少

Use of agriculturally derived products such as starch and replacement for totally synthetic polymers reduce our dependence on petrochemically derived monomers, and are currently an active research area because of the biodegradability of these plant-derived materials, It is important to acquire the fundamental data such as the thermophysical properties for the design and optimization of the apparatus to produce such materials, In the present work, the thermal conductivity of a starch-synthetic polymer composite was measured under heated and pressurized conditions, and the following conclusions were obtained.1) Development of the probe to measure thermal conductivity of the materialThe probe for thermal conductivity measurement of food materials under heated (- 150ﾟC) and pressurized conditions (-20MPa) has been developed, being based on the transient hot wire method.2) Thermal conductivity measurement of starch gelAfter the validity of the data measured using the probe was verified by c … More omparison with published data of water, the thermal conductivity of gelatinized potato starches was determined at 25-80ﾟC, 50-80 % moisture, and 0.2-10 MPa. It was found that the thermal conductivity of the starch gel increases with temperature and moisture content, and that it increases with pressure up to I MPa, above which it remains almost constant. The pressure dependency can be justified by considering the presence of entrapped fine air bubbles which could have penetrated into the sample during the preparation process.3) Thermal conductivity measurement of starch-synthetic polymer compositeThe thermal conductivity of starch-graft-poly(methylacrylate), which was prepared by ceric ammoniumnitrate-initiated polymerization of methylacrylate onto granular corn starch, was determined at 20-80ﾟC, 7-35%moisture and 0.2-8 MPa. It was found that the thermal conductivity increases with temperature and moisture content, although the temperature dependency is so small. Also, the thermal conductivity increases with pressure due to the same reason as 2). Less