PET／蒙脱土纳米复合材料的制备及其性能研究

将十六烷基三甲基溴化铵／聚乙二醇混合物处理的蒙脱土与聚对苯二甲酸乙二醇酯在哈克流变仪上进行熔融复合，制备了聚对苯二甲酸乙二醇酯(PET)/蒙脱土纳米复合材料。X射线衍射以及透射电镜分析表明，蒙脱土层间距明显增大，部分剥离并分散于PET基体中。对其力学性能和热性能的分析发现，当有机化蒙脱土用量为5％(质量含量，下同)时，材料的热变形温度及弯曲模量分别达到154℃和3．335GPa。     

PTT/MMT纳米复合材料的研究

采用熔融共混的方法制备了聚对苯二甲酸丙二醇酯/有机蒙脱土（PTT/MMT）纳米复合材料,通过DSC、热台偏光显微镜等研究了PTT/MMT纳米复合材料的结晶行为,测定了纳米复合材料的力学性能,并用熔体流变仪研究了PTT/MMT纳米复合材料熔体流变性能。结果表明：随着PTT/MMT纳米复合材料中蒙脱上含量的增加,PTT/MMT纳米复合材料的熔融结晶温度增高,纳米复合材料的力学性能有一定的提高;PTT-蒙脱土纳米复合材料熔体的流变性能随MMT含量的增加非牛顿性减弱,熔体的粘流活化能减小。     

PE/MMT纳米复合材料的研究进展

介绍蒙脱土(MMT)及其纳米复合材料的结构、特点及聚乙烯(PE)/MMT纳米复合材料的制备原理和方法,并对PE/MMT纳米复合材料的国内外研究进展进行了综述,指出今后PE/MMT纳米复合材料的研究重点是先对PE进行改性,以增加PE与MMT片层的粘结力。     

PET/MMT纳米复合材料的制备

采用烷基季铵盐对蒙脱土(MMT)进行有机化处理,采用插层聚合法制备PET/MMT纳米复合材料。探讨了不同的MMT来源、添加量及聚合条件对PET/MMT纳米复合材料耐热性能的影响。结果表明: MMT的添加质量分数为2.5%,缩聚反应终温250℃时,PET/MMT纳米复合材料具有较好的综合性能。     

PET/clay复合纳米复合材料

聚酯瓶在工程塑料和工业纤维领域有潜在的应用前景。讨论丁聚对苯二甲酸乙二酵酯（PET)／层状硅酸盐(蒙脱土)纳米复合材料的制备技术和新材料的结构与性能特征，PET的缩聚反应，利用DSC、WAXD、SALS、和偏光显微镜测定了PET／蒙脱土的结晶速率和结晶形态，说明PET／蒙脱土有着很快的结晶速率，不能生成球晶结构，一般只能生成结构不完整的微晶体。     

PET／EPDM／蒙脱土复合材料的性能研究

以聚对苯二甲酸乙二醇酯（PET）为基体，以三元乙丙橡胶（EPDM）为弹性体，用熔融共混的方法制备了不同比例的PET／EPDM／蒙脱土（MMT）复合体系。用原子力显微镜、扫描电子显微镜研究了复合材料的微观结构，并测试了力学性能。结果表明MMT含量较低时，用熔融共混的方法能制得PKT／EPDM／MMT纳米复合材料EPDM及增容剂的引入都较大程度地改善了复合材料的缺口冲击强度。     

PET／PEN共混聚酯的结晶和热稳定性能研究

通过DSC、偏光显微镜、TG以及热变形测试等分析方法，研究了聚对苯二甲酸乙二醇酯(PET)／聚对萘二甲酸乙二醇酯(PEN)共混物的结晶特征以及热稳定性能。结果表明：PEN的结晶温度高，结晶历程长，快速降温会导致PEN结晶困难或不结晶。PET／PEN共混物结晶性能与PEN含量密切相关，含量低能结晶，含量达3a％时基本不结晶。PET／PEN共混物的热分解温度比PEN提高了4℃，总残留率比PET提高T5．57％，其中空吹塑容器的热收缩率随PEN含量的增加而降低，表明PET／PEN共混材料的热稳定性能好于纯PFT。     

PET／蒙脱土纳米复合材料的增韧研究

以聚对苯二甲酸乙二酯（PET）为基体，以（甲基丙烯酸甲酯／丙烯腈／丁二烯／苯乙烯）共聚物为增韧剂，采用熔融共混法制备了PET／蒙脱土纳米复合材料。用广角X射线衍射仪、透射电子显微镜研究了复合材料的微观结构，并测试了力学性能。结果表明，所制得的纳米复合材料具有剥离型和插层型结构：增韧剂及增容剂的引入都较大程度地提高了复合材料的缺口冲击强度，而拉伸强度和弯曲强度基本不变：纳米蒙脱土及增客剂的加入提高了纳米复合材料结晶性能。     

PET/MMT纳米复合材料的研究进展

综述了聚对苯二甲酸乙二酯(PET）/蒙脱土(MMT)纳米复合材料的2种制备方法、性能及其表征方法。MMT对PET的改性可以提高PET的阻隔性和结晶速率．并使PET拉伸模量和热变形温度大幅度提高,是目前PET改性的新方向。     

PTT/MMT纳米复合材料的制备及性能的研究

采用熔融共混的方法制备了聚对苯二甲酸丙二醇蘸/蒙脱土(PTT/MMT)纳米复合材料,并用红外光谱表征了PTT/MMT纳米复合材料的结构.通过DSC、热台偏光显微镜等研究了PTT/MMT纳米复合材料的结晶行为,测定了纳米复合材料的力学性能.结果表明,随着PTT/MMT纳米复合材料中蒙脱土含量的增加,PTT/MMT纳米复合材料的熔融结晶温度增高.其结晶过程为异相成核,纳米复合材料的力学性能有一定的提高.     

黑山膨润土钠化工艺研究

以黑山天然膨润土为原料,采用阳离子交换树脂交换的方法对天然膨润土进行钠化改型,通过正交试验确定了最佳条件。该方法具有不引入阴离子或沉淀物、分离容易等优点,大大减少了后处理步骤。制备出稳定的钠基蒙脱石悬浮液,干燥后产品的阳离子交换容量是127.88 mmol/100 g,吸蓝量为42.35 g/100 g,蒙脱石纯度达到了95.81%。XRD衍射分析表明产品达到高品质钠基蒙脱石的要求,为其深层次的加工应用打下良好的基础。     

聚合物/蒙脱土纳米复合材料的研究进展

简要概述了聚合物/蒙脱土纳米复合材料的结构及性能,详细介绍了聚酰胺/蒙脱土、聚烯烃/蒙脱土和热固性树脂/蒙脱土纳米复合材料的研究进展。并总结了复合材料的各种优异性能,分析了蒙脱土提高复合材料性能的机理。     

环氧树脂/蒙脱土纳米复合材料的性能研究进展

阐述了近年来环氧树脂/蒙脱土纳米复合材料的力学性能、阻燃性能、气阻性能、耐热性能的研究进展。指出大幅度提高材料在玻璃态的储存模量与韧性是现阶段有待解决的难题,而探讨插层型复合材料的力学性质及利用蒙脱土开发绿色环保的阻燃材料和气阻材料是当今的研究方向。     

Study on the Crystallization Properties of Polypropylene/Montmorillonite Composites

The crystalline size of polypropylene (PP) filled with montmorillonite (MMT) was studied by X-ray diffraction (XRD). The isothermal crystallization behavior of polypropylene was studied by means of differential scanning calorimetry (DSC). The Avrami equation was used to describe the isothermal crystalline kinetics of PP/MMT composites. The result showed that the addition of MMT decreased the crystalline size L _hkl of the polymer. MMT was used as nucleating agent during isothermal crystallization process of polypropylene. The addition of montmorillonite decreased the crystallization time of the polypropylene and the melt point was raised. The value of Avrami exponent n was related with the crystallization temperature. The value of Avrami pre-index factor k of PP/MMT composite was decreased with increasing crystallization temperature. The value of half crystallization time t _1/2 of PP/MMT composite was less than that of PP at a given crystallization temperature, signifying that montmorillonite acted as nucleating agent, accelerated the overall crystallization process.     

聚丙烯/蒙脱土纳米复合材料的结晶性能研究

采用差示扫描量热法研究蒙脱土(MMT)对聚丙烯(PP)等温结晶性能的影响。结果表明：加入MMT后提高了PP的结晶速率,使结晶度增大,但对PP熔点的影响不大;加入相容剂PP-g-MAH后,使有机MMT对PP的成核作用更加明显,从而提高了PP／MMT。纳米复合材料的结晶度;PP／MMT纳米复合材料的n值在3左右,其成核方式是异相成核方式。     

Crystallization Study of Glassy PET/PEN Blends by Means of Real Time X-ray Scattering

Abstract

The crystallization of several blends of poly(ethylene terephthalate) (PET) and poly(ethylene 2,6 naphthalene dicarboxylate) (PEN) has been investigated by wide angle- (WAXS) and small angle X-ray scattering (SAXS) using synchrotron radiation. The role of transesterification reactions, giving rise to a fully amorphous non-crystal-lizable material (copolyester) is brought up. For the blends rich in PET, crystallization temperatures (T_c ) of 105 and 117°C were used. For blends rich in PEN, crystaffization was performed at T_c =150 and 165°C, respectively. The time variation of the degree of crystallinity was fitted into an Avrami equation considering the induction time prior to the beginning of crystallization. The Avrami parameters, the half times of crystallization, as well as the nanostructure development (SAXS invariant and long period) for the blends, are discussed in relation to blend composition and are compared to the parameters observed for the homopolymers PET and PEN.     

聚丙烯/蒙脱土纳米复合材料的制备与性能

合成了TiCl4/MgCl2/MMT插层催化剂,通过原位聚合制备了聚丙烯/蒙脱土纳米复合材料。X射线衍射结果表明:蒙脱土在聚丙烯基质中达到了纳米级分散。与纯聚丙烯(PP5004)相比,聚丙烯/蒙脱土纳米复合材料的力学性能、维卡软化点、热变形温度以及热分解温度都有所提高。     

PEN合成的酯交换反应工艺及动力学研究

讨论了使用 (CH3COO) 2 Zn·2H2 O作为催化剂 ,2 ,6 萘二甲酸二甲酯 (DMN) 乙二醇 (EG)的酯交换反应。该酯交换反应遵循二级反应动力学。反应活化能为 14 7.9kJ mol。较高的反应活化能使得该酯交换反应速率对反应温度比较敏感。     

Mechanical,Morphological and Thermal Properties of Polycarbonate/SEBS-G-MA/Montmorillonite Nanocomposites

Nanocomposites based on polycarbonate (PC) containing sodium montmorillonite (NaMMT) and maleic anhydride grafted styrene-ethylene/butylene-styrene (SEBS-g-MA) were prepared by melt compounding method followed by injection molding. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed the formation of intercalated nanocomposites. Incorporation of SEBS-g-MA into the PC/MMT nanocomposites enhanced ductility and impact strength but slightly reduced tensile strength and stiffness. The glass transition temperature (T _g – detected from DMTA) and onset temperature (T _onset – detected from TGA) of the PC nanocomposites was increased in the presence of SEBS-g-MA. For this PC/NaMMT system, SEBS-g-MA could act as an effective toughening agent.     

Rheology,Crystallization Kinetics and Mechanical Properties of HDPE/Vinyl-POSS Nanocomposites

Polyhedral oligomeric silsesquioxane (POSS) is usually prepared from the hydrolytic condensation of organotrialkoxysilanes. The rheology, non-isothermal crystallization kinetics and mechanical properties of high density polyethylene (HDPE)/vinyl-containing POSS (V-POSS) nanocomposites were investigated. The results show that the molten HDPE/V-POSS belong to pseudoplastic fluid. The V-POSS can accelerate the nucleation of HDPE at starting stage of crystallization. However, it will decrease the crystallization ability of HDPE in the subsequent crystallization process. The modified Avrami analysis by Jeziorny can well explain the crystallization behaviour of HDPE/V-POSS. The yield strength and tensile modulus of nanocomposites both increase when V-POSS content is 6%.