超细Al(OH)3对PP球晶结构和性能的影响

分别用超细Al(OH)_3和普通Al(OH)_3填充聚丙烯(PP),研究了超细Al(OH)_3/PP和普通Al(OH)_3/PP体系的力学性能、熔体流动性、阻燃性能及其结晶的微观形态。结果表明,加入适量的超细Al(OH)_3对PP具有增韧效应;超细Al(OH)_3能使PP球晶显著细化;与普通Al(OH)3/PP相比,超细Al(OH)_3/PP具有较好的抗冲击性能、拉伸性能和弯曲性能,但熔体流动性低。     

无机阻燃剂Al(OH)_3和Mg(OH)_2填充PP的研究

本文用极限氧指数法、差热分析(DTA)研究了无机阻燃剂Al(OH)_3、Mg(OH)_2在PP中的阻燃作用。实验结果表明:两者在PP中有阻燃协同效应。Al(OH)_3,的脱水吸热反应及Mg(OH)_2:成炭作用是阻燃主要因素。同时,用偶联剂改善阻燃剂与PP的相容性,为无机阻燃PP的研制提供了依据。     

原位形成FPP偶联Al(OH)3/PP中的界面相互作用研究

制备低含量Al(OH)3填充PP复合材料[Al(OH)3/PP]，研究原位形成的官能团化聚丙烯（FPP）在Al(OH)3/PP中的结晶、熔融行为，结晶形态，以及与各组分间的相互作用。研究认为，在复合材料中存在Al(OH)3与FPP间的化学作用，FPP与PP的相容与共结晶作用，Al(OH)3表面异相诱导成核作用，FPP对Al(OH)3表面异相诱导成核作用的活化作用等，从而改善了Al(OH)3/PP的物理与力学性能。     

HDPE/Nano-CaCO_3复合材料界面改性研究

采用熔融共混法制备了高密度聚乙烯(HDPE)/HDPE接枝马来酸酐(HDPE-g-MAH)/纳米碳酸钙(nano-CaCO3)复合材料,研究了HDPE-g-MAH用量对复合材料力学性能的影响,并利用透射电镜(TEM)分析了nano-CaCO3在HDPE基体中的分散性。结果表明:HDPE-g-MAH的加入可明显改善复合材料的力学性能,并且有助于强化nano-CaCO3在HDPE基体中的分散效果。     

红磷增效Al（OH）3和Mg（OH）2阻燃聚丙烯的研究

本文通过氧指数测定和差热分析,研究了红磷对 Al(OH)_3和 Mg(OH)_2阻燃 PP的增效作用。实验結果表明:虽然红磷单独对 PP 的阻燃效果不好,但由于它与Al(OH)_3和 Mg(OH)_2之间对于 PP 具有阻燃协同效应,所以加入少量红磷就能够增强Al(OH)_3和 Mg(OH)_2对于 PP 的阻燃效果。     

油墨用Al(OH)_3在橡胶配方中的应用

本文介绍了油墨用 Al(OH) 3 的基本特征及其在橡胶配方中的应用情况。随着现代生产技术的发展 ,油墨用 Al(OH) 3 的活性有了很大改进 ,经硅烷处理过的 Al(OH) 3 可改善其在橡胶中的分散性 ,提高胶料的强度、硬度及其均匀度。结果表明 ,油墨用 Al(OH) 3 能够在橡胶配方中使用     

EVA／Al（OH）3纳米复合材料性能的研究

采用熔融共混挤出法制备了EVA／Al(OH)3纳米复合材料。用TEM、SEM分析了Al(OH)3粉体改性前后在EVA树脂中的分散性与相容性。研究了表面处理对复合材料阻燃与力学性能的影响，并对Al(OH)3阻燃机理进行了探讨。结果表明：采用钛酸酯偶联剂对粉体进行表面改性可有效改善其在树脂中的分散与结合情况，复合材料阻燃级别提高到UL94 V-1级，拉伸性能得到改善。     

油墨用Al（OH）3在橡胶配方中的应用

本文介绍了油墨用Al(OH)3的基本特征及其在橡胶配方中的应用情况，随着现代生产技术的发展，油墨用Al(OH)3的活性有很大改进，经硅烷处理过的Al(OH)3可改善其在橡胶中的分散性，提高胶料的强度，硬度及其均匀度，结果表明，油墨用Al(OH)3的能够在橡胶配方中使用。     

纳米Al(OH)3/PP复合材料性能与结构研究

采用双螺杆造粒,单螺杆挤出制样的方法制备了纳米Al(OH)3/PP复合材料。通过TEM及力学性能测试研究了复合材料的力学性能和Al(OH)3的分散状况。在纳米Al(OH)3/PP复合体系中,纳米Al(OH)3的加入,不但提高了复合材料的冲击强度,而且显著提高了复合材料的弯曲弹性模量。纳米Al(OH)3的增韧机理在于纳米Al(OH)3作为应力集中点诱发大量银纹,吸收大量的冲击能量。     

聚丙烯改性无卤阻燃复合材料的研究

以聚丙烯(PP)为基材,探讨了不同用量的氢氧化镁(Mg(OH)_2)、微胶囊化红磷(MRP)对PP阻燃性能和力学性能的影响。实验结果表明:随着Mg(OH)_2用量的增加,PP/Mg(OH)_2复合材料的阻燃性能随之升高而力学性能下降。当Mg(OH)_2与MRP复配使用时,MRP的加入可减少Mg(OH)_2的用量,PP/Mg(OH)_2/MRP(100:100:12)与PP/Mg(OH)_2(100:150)的复合材料相比可以看出,拉伸强度、断裂伸长率、冲击强度分别提高了23.73%、38.52%、189%,表明Mg(OH)_2和MRP在PP无卤阻燃复合材料中具有很好的协效阻燃作用。相容剂PP-g-MAH的加入可以提升PP无卤阻燃复合材料的力学性能,PP-g-MAH用量为8份时,PP无卤阻燃复合材料的冲击强度和拉伸强度分别可达4.23kJ/m~2和25.6MPa,同时拥有良好的阻燃性能和加工性能。     

Mechanical properties and fracture morphology of Al(OH)3/polypropylene composites modified by PP grafting with acrylic acid

Al(OH)₃/polypropylene (PP) composites modified by polypropylene grafted with acrylic acid (FPP) were prepared by melt extrusion. Effect of PP grafting with acrylic acid on mechanical properties and fracture morphology of Al(OH)₃/polypropylene composites were investigated. Although incorporation of Al(OH)₃ reduced the mechanical properties of PP, addition of FPP increased the mechanical properties of Al(OH)₃/PP composites. It is suggested that addition of FPP improve the dispersion of Al(OH)₃ and the interfacial interaction between filler and matrix. Mechanical properties of Al(OH)₃/FPP/PP composites depend on the grafting rate and the content of FPP. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2617–2623, 2001     

PP/Al(OH)_3/Mg(OH)_2复合材料的导热性能

制备了PP（聚丙烯）/Al(OH)₃/Mg(OH)₂导热复合材料,并用稳态平板导热系数测试仪在不同测试温度下测定该复合材料的导热系数。结果表明,加入Al(OH)₃和Mg(OH)₂使PP导热系数提高。复合材料的导热系数随着填料含量的增加而非线性提高,随着测试温度的升高而非线性提高,随着填料粒径的增大而非线性增大。     

氢氧化铝复合阻燃剂对热硫化硅橡胶性能的影响

研究了氢氧化铝、氢氧化铝／三氧化二锑并用、氢氧化铝／三氧化钼并用对热硫化(HTV)硅橡胶阻燃性能和力学性能的影响；试图在力学性能与阻燃性能之间寻找平衡。结果表明：当100份硅橡胶中氢氧化铝的用量为80份时，硅橡胶的燃烧氧指数(OI值)可达30％，但力学性能却受到严重损害，发烟量为B级；氢氧化铝／三氧化二锑并用时，HTV硅橡胶的性能较理想；当(氢氧化铝 三氧化二锑)用量为50份时，硅橡胶的OI值为31％、拉伸强度为6．3MPa、扯断伸长率为660％、撕裂强度为23．7kN／m、邵尔A硬度为57度，但发烟量为C级；氢氧化铝／三氧化钼并用可使HTV硅橡胶燃烧时的发烟量达到A级，但不能显著提高其阻燃性能，当(氢氧化铝 三氧化钼)用量为96份时，HTV硅橡胶的OI值仅28％，且此时其力学性能受到较大损害。     

PBH/PP及PBH/CaCO_3/PP共混改性研究

采用自制的负载钛催化剂[TiCl4/MgCl2-Al(i-Bu)3],合成了1-丁烯-1-己烯共聚物(PBH)。用己烯摩尔含量为2%、7%、20%的PBH对PP进行共混,研究了共混物的力学性能;以己烯初始摩尔含量为30%的PBH作为CaCO3的载体,填充PP,并与未采用载体的CaCO3填充体系进行比较。结果表明:随着PBH含量的增加,在共混物拉伸强度、弯曲强度、硬度有一定下降的同时,冲击强度则明显提高,己烯摩尔含量大的PBH增韧改性PP的效果更好;以PBH作为载体的CaCO3,随着其含量的增加,共混物的冲击强度明显增大,而拉伸强度、弯曲强度、硬度却有一定程度的下降。与无PBH载体CaCO3填充PP的规律明显不同。     

Functionalized elastomeric compatibilizer in PA 6/PP blends and binary interactions between compatibilizer and polymer

Superior impact properties were obtained when maleic anhydride grafted styrene ethylene/butylene styrene block copolymer (SEBS-g-MAH) was used as a compatibilizer in blends of polyamide 6 (PA 6) and isotactic polypropylene (PP), where polyamide was the majority phase and polypropylene the minority phase. The optimum impact properties were achieved when the weight relation PA:PP was 80:20 and 10 wt% SEBS-g-MAH was added. The blend morphology was systematically investigated. Transmission electron microscopy (TEM) indicated that the compatibilizer forms a cellular structure in the PA phase in addition to acting as an interfacial agent between the two polymer phases. In this cellular-like morphology the compatibilizer appears to form the continuous phase, while polyamide and polypropylene form separate dispersions. In microscopy, PA appeared as a fine dispersion and PP as a coarse dispersion. The mechanical properties indicated that in fact PA, too, is continuous, and the blend can be interpreted as possessing a modified semi-interpenetrating network (IPN) structure with separate secondary dispersion of PP. The coarser PP dispersion plays an essential role in impact modification. Binary blends of the compatibilizer and one blend component were also investigated separately. The same cellular structure was observed in the binary PA/SEBS-g-MAH blends, and SEBS-g-MAH again appeared to form the continuous phase when the elastomer concentration was at least 10 to 20 wt%. By contrast, in PP/SEBS-g-MAH only conventional dispersion of elastomeric SEBS-g-MAH was observed up to 40 wt% elastomer. Impact strength was improved and the elastic modulus was lowered in both PA/SEBS-g-MAH and PP/SEBS-g-MAH blends when the elastomer content was increased. The changes in modulus indicate that the semi-IPN-like structure is formed in the binary PA/SEBS-g-MAH blends as well as in the ternary structure.     

Fine disperse dyeable polypropylene fiber from polypropylene/polystyrene nano‐ceria blends

The blend of polypropylene (PP) and atactic polystyrene (PS) hybrid with nano‐ceria (CeO₂) was prepared for fine dyeable fiber. Nano‐CeO₂ modified with stearic acid was in situ added to PS by radical suspension polymerization. The dispersion of hy‐PS with nano‐CeO₂ in the PP crystals was investigated. The rheological behavior of the blend was similar to that of PP under the testing conditions, and the blend had stable spinning and drawing processability. The fine modified PP filaments were processed from the blend and had practical mechanical properties. The dyeability of the knitting fabrics from these filaments was studied. The increased amorphous content and the interface between PP and hy‐PS allowed the dye to penetrate the fiber, and the modified PP fiber had strong affinity to dye because of the complexation between cerium and dye. These effects resulted in improving K/S value and color fastness to soaping. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Thermal properties and flame retardance of Al(OH)3/polypropylene composites modified by polypropylene grafting with acrylic acid

The effect of polypropylene grafting with acrylic acid, PP‐g‐AA (FPP), on crystallization and melting behavior, thermal degradation, and limiting oxygen index of Al(OH)₃/PP composites were investigated. The results indicated that crystallization temperature of PP shifted to high temperature with increasing content of Al(OH)₃ because of the interfacial heterogeneous nucleation of Al(OH)₃ and further increased by the addition of FPP and with increasing FPP content because of the improvement of the dispersion of Al(OH)₃ in PP matrix and the increase in the nucleating sites of Al(OH)₃. With adding Al(OH)₃ and increasing the content of Al(OH)₃, limiting oxygen index values of composites increased and further improved by adding FPP. This is attributed to the presence of an interfacial interaction between FPP and Al(OH)₃. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2679–2686, 2001