定形相变材料的制备及在聚丙烯中的应用

发布时间：2018-04-21 13:10

本文选题：聚乙二醇单甲醚 + 分子筛　；参考：《东华大学》2017年硕士论文

【摘要】：蓄热调温纺织品是将适合人类身体温度的相变材料植入到纤维及纺织产品内部,能够在外界吸收或放出热量调节体温的纤维和纺织品。它能够随所处环境的变化而吸收或放出热量,从而保持人体皮肤微气候的温度恒定,提高服用舒适性。本项研究旨在利用传统聚丙烯熔融加工方法制备具有调温性能的聚丙烯共混体系,对调温纤维前期产品进行应用基础研究。研究内容主要分为两部分:首先为定形相变材料的制备,即采用适合人体体温范围内具备相变行为的聚乙二醇单甲醚1000作为相变材料,选用介孔分子筛和蒙脱土作为载体材料,分别利用溶液吸附法及插层法制备定形相变材料,采用FTIR、SEM及DSC等手段对定形相变材料的形貌结构与相变性能进行表征和分析。然后,将定形相变材料与聚丙烯树脂利用熔融共混技术制备不同含量定形相变材料的聚丙烯/定形相变材料共混体系,采用SEM、DCS、TGA等手段对共混体系的结构、性能及影响因素进行系统分析。研究定形相变材料的加入对于聚丙烯复合相变材料的相变性能保持的影响,为熔融法制备聚丙烯相变纤维奠定了一定的基础。通过本研究得到的主要结论如下:(1)采用溶液吸附法,选取有机相变材料聚乙二醇单甲醚(MPEG1000)作为相变介质,以具有超高表面积的介孔分子筛(MCM-41)作为无机载体材料,制备了MPEG1000/MCM-41定形相变材料。并采用扫描电镜(SEM)、BET比表面积及孔径分布测试及DSC等测试手段分别对介孔分子筛和MPEG1000/MCM-41复合相变材料的表面形貌、结构、物理吸附性能及相变性能进行表征。表征结果显示:MCM-41表面积高达769.4 m2/g,MPEG1000固定在分子筛孔隙及表面,DSC分析表明MPEG1000/MCM-41定形相变材料中随相变材料含量的增加,相变焓逐渐增大,MPEG1000的最佳含量在65%,相变潜热为83.3 J/g;MPEG1000的羟基与和载体材料介孔分子筛硅氧面上的氧形成了氢键,两者之间并没有发生化学反应,没有新物质的生成;SEM测试表明相变材料均匀的分布在载体的孔洞及表面;蓄/放热试验表明MPEG1000/MCM-41定形相变材料具有优良的调温性能。(2)以聚乙二醇单甲醚1000为相变材料、蒙脱土为载体材料,通过溶液插层法及熔融插层法,将相变材料插入到蒙脱土层间,制备MPEG1000/MMT定形相变材料。采用FT-IR、SEM、XRD及DSC等分析手段对上述两种定形相变材料形貌、结构及相变性能进行表征。结果表明:两种不同的制备方法获得的复合定形相变材料具有相似的形貌和结构特征;蒙脱土的内羟基与聚乙二醇单甲醚的羟基形成了氢键,MPEG1000以物理作用吸附于MMT片层结构中,在表面张力和层间作用力等作用下,MPEG1000被限制在无机MMT载体的层间,阻止了泄露;熔融插层法制备的定形相变材料的储热性能较优,聚乙二醇单甲醚的最佳含量为47%,相变温度为36.6?C、相变潜热为57.1 J/g;热重分析定形相变材料在300?C以下没有质量损失,蓄/放热试验表明MPEG1000/MMT定形相变材料具有良好的升降温滞后性。(3)以聚丙烯为基体,与蒙脱土基定形相变材料利用熔融共混制备聚丙烯/蒙脱土基定形相变材料共混体系。采用SEM分析相变材料在共混体系中的分散情况,采用DSC分析共混体系的相变性能,采用FT-IR对共混体系各组分之间的相互作用。结果表明,蒙脱土基定形相变材料在PP/MPEG1000/MMT共混体系中分布均匀,粒径在2~5μm左右,相变焓达到21.4 J/g,与PP/MPEG1000共混物对比,PP/MPEG1000/MMT共混体系的相变焓是其3.6倍,定形相变材料的制备有效解决了MPEG1000在聚丙烯熔融加工过程的泄露问题,为熔融纺制聚丙烯相变纤维奠定了一定的基础。
[Abstract]:Heat storage and tempering textiles are fibers and textiles that can be implanted into the fiber and textile products, which are suitable for human body temperature, and can absorb or release heat from the outside world. It can absorb or release heat with the changes in the environment, thus keeping the temperature of the skin microclimate constant and improving the comfort of the body. The purpose of this study is to prepare the polypropylene blends with temperature regulating properties by using the traditional polypropylene melting process. The basic research on the application of the pre tempered fiber is divided into two parts: first, the preparation of the fixed phase change material, that is, the PCM suitable for the body temperature range is suitable for the PCM two. The mesoporous molecular sieve and montmorillonite as the carrier materials are selected as the phase change materials, and the form phase change materials are prepared by the solution adsorption method and the intercalation method respectively. The morphology and phase change properties of the fixed phase change materials are characterized and analyzed by FTIR, SEM and DSC. Then the fixed phase change material and the polypropylene resin are used. The blend system of polypropylene / shape phase change materials with different content of shape phase change materials was prepared by melt blending technology. The structure, properties and influence factors of the blend system were systematically analyzed by SEM, DCS and TGA. The effect of the addition of the phase change material on the phase change properties of the PCM was studied. The main conclusions of this study are as follows: (1) the solution adsorption method was used to select the organic phase change material polyethylene glycol monomethyl ether (MPEG1000) as the phase change medium, and the mesoporous molecular sieve (MCM-41) with super high surface area was used as the inorganic carrier material, and the MPEG1000/MCM-41 was prepared. The surface morphology, structure, physical adsorption properties and phase transition properties of mesoporous molecular sieves and MPEG1000/MCM-41 composite phase change materials were characterized by scanning electron microscopy (SEM), BET specific surface area and pore size distribution test and DSC, respectively. The results showed that the surface area of MCM-41 was as high as 769.4 m2/g and MPEG1000 fixed. On the pore and surface of molecular sieve, DSC analysis shows that the enthalpy of phase change gradually increases with the increase of phase change material content in MPEG1000/MCM-41 shape phase change material, the optimum content of MPEG1000 is 65%, and the latent heat of phase change is 83.3 J/g, and the hydroxyl of MPEG1000 has formed hydrogen bonds with the oxygen on the silicon oxygen surface of the mesoporous molecular sieve. The chemical reaction has no new substance, and the SEM test shows that the phase change material is evenly distributed on the hole and surface of the carrier. The experiment of storage / exothermic test shows that the MPEG1000/MCM-41 fixed phase change material has excellent tempering properties. (2) the peg monomethyl ether 1000 is the phase change material, the montmorillonite is the carrier material, the solution intercalation method and the melt intercalation layer are used. The phase change material was inserted into the montmorillonite layer to prepare the MPEG1000/MMT shape phase change material. The morphology, structure and phase transition properties of the two types of phase change materials were characterized by FT-IR, SEM, XRD and DSC. The results showed that the composite shape phase change materials obtained by two different preparation methods had similar morphology and structure. Characteristics: the internal hydroxyl of montmorillonite and the hydroxyl group of polyethylene glycol monomethyl ether formed hydrogen bonds, and MPEG1000 was adsorbed in the MMT lamellar structure by physical action. Under the action of surface tension and interlayer force, MPEG1000 was restricted between the layers of the inorganic MMT carrier and prevented the leakage, and the heat storage performance of the fixed phase change material prepared by the melt intercalation method was superior. The optimum content of polyethylene glycol monomethyl ether is 47%, the phase transition temperature is 36.6? C and the latent heat of phase change is 57.1 J/g; the thermogravimetric analysis of the shape change phase change material has no mass loss under 300? C. The storage / exothermic test shows that the MPEG1000/MMT shape phase change material has a good temperature lag lag. (3) the polypropylene is the matrix and the montmorillonite based phase change material is beneficial. The blend system of polypropylene / montmorillonite based phase change material was prepared by melt blending. The dispersion of phase change materials in the blend system was analyzed by SEM. The phase transformation properties of the blend system were analyzed by DSC and the interaction between the components of the blend system was used by FT-IR. The results showed that the montmorillonite based phase change phase change material was in the PP/MPEG1000/MMT common. The mixing system is distributed evenly, the particle size is about 2~5 mu m, the enthalpy of phase change reaches 21.4 J/g. Compared with PP/MPEG1000 blends, the phase change enthalpy of PP/MPEG1000/MMT blends is 3.6 times. The preparation of the amorphous phase change material can effectively solve the leakage question of MPEG1000 in the melt process of polypropylene, which lays a solid foundation for the melt spinning of polypropylene phase change fiber. The foundation of the set.

【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS102.526;TB34

【参考文献】