HIPS／改性氢氧化镁晶须复合材料的研究

采用乙烯基硅烷在氢氧化镁(MH)晶须表面引入乙烯基后与苯乙烯进行原位聚合,得到了聚苯乙烯改性的氢氧化镁晶须(MMH).将MMH与高抗冲聚苯乙烯(HIPS)熔融复合制备了HIPS/MMH复合材料,研究了复合材料的微观结构和力学性能.结果表明,聚苯乙烯包覆在MH表面,并形成了共价键结合;原位聚合改性改善了MH在HIPS基体中的分散性,增强了MH和HIPS的界面相互作用,显著提高了HIPS/MMH复合材料的拉伸强度与冲击韧性.     

原位聚合制备尼龙6/改性氢氧化镁纳米复合材料及其性能的研究

对纳米氢氧化镁(NMH)进行硅烷KH570接枝改性后,将甲基丙烯酸甲酯(MMA)与之共聚获得表面改性的纳米氢氧化镁(MNMH),然后在催化剂作用下原位聚合制备PA 6/MNMH纳米复合材料。利用FTIR、SEM、热重分析和电子拉力机对NMH及PA 6/MNMH纳米复合材料的结构与性能进行测试与表征。红外光谱分析表明改性的NMH表面成功接枝了KH570和聚甲基丙烯酸甲酯(PMMA)。PA 6/NMH-KH570-PMMA复合材料的缺口冲击强度比PA 6/NMH纳米复合材料的提高34%。NMH或其改性NMH的加入提高了PA 6纳米复合材料的热稳定性。     

CoAl-LDH与膨胀型阻燃剂协同阻燃HIPS及性能研究

根据层状双金属氢氧化物(LDH)的阻隔及催化成炭作用,将合成的CoAl-LDH作为协效剂,与APP/PER膨胀型阻燃体系(IFR)复配协同阻燃高抗冲聚苯乙烯(HIPS)。研究发现:引入的CoAl-LDH CoAl-LDH、29.7%IFR时,HIPE-3复合材料的拉伸强度达到23.85 MPa,冲击强度提高到2.69 kJ/m2,LOI达到28.5%,UL-94达到V-0级别,燃烧后生成连续且致密的炭层。     

HIPS/CG-ATH纳米复合材料界面改性研究

采用熔融共混法制备出了高抗冲聚苯乙烯(HIPS)/高抗冲聚苯乙烯接枝马来酸酐(MHIPS)/CG-ATH纳米复合材料,研究了MHIPS的加入量对复合材料阻燃性能和力学性能的影响,利用透射电镜(TEM)和扫描电镜(SEM)分析了纳米CG-ATH在HIPS基体中的分散性及其与HIPS基体间的界面粘接性.结果表明MHIPS的加入可以显著改善复合材料的阻燃性能和力学性能,并且有助于强化纳米CG-ATH在HIPS基体中的分散性及其与HIPS基体间的界面粘接性.     

HIPS/纳米CaCO3复合材料性能与结构研究

通过混合、熔融挤出,将纳米CaCO3填充到高抗冲聚苯乙烯(HIPS)中,制得高强度、低成本的HIPS/纳米CaCO3复合材料。对该复合材料进行了力学性能测试和微观结构观察,并讨论了纳米CaCO3增韧HIPS的机理。结果表明,纳米CaCO3用量为12份时,对HIPS/纳米CaCO3复合材料有明显的增韧增强作用,而且可使原料成本降低12%左右。     

原位聚合制备尼龙6/氢氧化镁纳米复合材料

对纳米氢氧化镁(NMH)进行硅烷(KH-550)接枝处理后,在催化剂作用下原位聚合制备了PA6/MNMH纳米复合材料.利用FTIR、SEM、热失重分析、电子拉力机和熔体流动速率仪对改性前后NMH填充的PA6纳米复合材料的结构与性能进行了表征与测试.红外光谱分析表明,改性后NMH的表面成功接上了硅烷.以改性NMH(MN-...     

无卤阻燃剂复配阻燃HIPS的性能研究

研究了不同配比的红磷阻燃母料(RPM)与氢氧化镁(MH)协同阻燃高抗冲聚苯乙烯(HIPS)体系的阻燃性能和机械性能。并选取最佳红磷阻燃母料与氢氧化镁的配比,再分别与其他无卤阻燃剂如酚醛树脂、氧化锌、氰尿酸三聚氰胺盐、有机纳米蒙脱土复配来共同阻燃HIPS,并分别对其体系的机械性能和阻燃性能进行了研究。结果表明,在RPM/MH质量比为1,总质量分数为30%时,与7%的酚醛树脂或有机纳米蒙脱土复配,都可以使阻燃HIPS材料达到1.6 mm UL94的V-1级。     

HIPS增韧阻燃改性

采用超细SEBS、SEBS-g-MAH和ABS-g-MAH对高抗冲聚苯乙烯(HIPS)进行增韧改性研究,考察3种增韧剂对HIPS力学性能的影响.同时研究阻燃剂十溴二苯醚、八溴醚分别与三氧化二锑复配体系以及氢氧化镁对HIPS力学及阻燃性能的影响.实验结果表明:SEBS能大幅度提高HIPS的冲击强度,且对材料的其他性能影响较小;阻燃荆十溴二苯醚与三氧化二锑复配体系对超细SEBS的阻燃效果最佳,材料的力学性能最优.     

不同偶联剂处理Mg(OH)2对无卤阻燃HIPS性能的影响

分别采用钛酸酯偶联剂NDE311、硅烷偶联剂KH550处理氢氧化镁[Mg(OH)2],将偶联Mg(OH)2与微胶囊化红磷复配无卤阻燃高抗冲聚苯乙烯树脂(HIPS).比较添加偶联剂前后Mg(OH)2无卤阻燃HIPS的综合性能,发现偶联改性可改善材料的阻燃性能、弯曲性能;比较不同偶联剂处理Mg(OH)2的无卤阻燃HIPS的综合性能,发现经KH550偶联剂处理后的材料综合性能较好.     

TiO2分散对HIPS/纳米TiO2复合材料性能影响

用透射电子显微镜（TEM）、扫描电子显微镜（SEM）及电子能谱（EDS）表征了高抗冲聚苯乙烯（HIPS）基体中纳米TiO2粒子的分散，研究了HIPS／纳米TiO2复合材料中纳米粒子的分散对复合材料力学性能的影响。结果表明，EDS可较好地表征纳米TiO2的分散行为；在纳米HIPS／TiO2复合体系中，当纳米TiO2质量分数为1．0％时，纳米粒子在复合材料中呈较均匀分散，对HIPS基体起着提高强度和韧性的作用；随着纳米TiO2含量的提高，纳米粒子发生明显团聚，对HIPS的增强增韧作用减弱；TEM，SEM及EDS结合使用，可较好地表征纳米粒子在复合材料的分散行为。     

Morphology and mechanical properties of high‐impact polystyrene/elastomer/magnesium hydroxide composites

Ternary composites of high‐impact polystyrene (HIPS), elastomer, and magnesium hydroxide filler encapsulated by polystyrene were prepared to study the relationships between their structure and mechanical properties. Two kinds of morphology were formed. Separation of elastomer and filler was found when a nonpolar poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] triblock copolymer (SEBS) was incorporated. Encapsulation of filler by elastomer was achieved by using the corresponding maleinated SEBS (SEBS‐g‐MA). The mechanical properties of ternary composites were strongly dependent on microstructure. In this study, the composites with separate dispersion structure showed higher elongation, modulus and impact strength than those of encapsulation structure. Impact‐fracture surface observation showed that the toughening mechanism was mainly due to the massive cavitation and extensive matrix yielding. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:5184–5190, 2006     

Interfacial modification of high impact polystyrene magnesium hydroxide composites effects on flame retardancy properties

High impact polystyrene (HIPS)/magnesium hydroxide (MH) composites were prepared by melt‐blending. Two kinds of interfacial modifiers were used in this research, maleinated poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] (SEBS‐g‐MA) triblock copolymer and PS. The effects of the use levels of SEBS‐g‐MA on the flame retardancy of HIPS/elastomer/MH based on unmodified and PS‐modified surface were investigated by TEM, FTIR, and combustion tests (horizontal burning test and cone calorimetry). The combustion results showed that comparing composites containing unmodified MH, the flame retarding properties of composites containing PS‐modified MH were obviously improved. The increased performance can be explained that the PS covered on the surface of MH could further improve dispersion of the filler in matrix. Furthermore, there existed a critical thickness of interfacial boundary for optimum flame‐retarding properties in both ternary composites based MH and PS‐modified MH. When the interfacial boundary relative thickness is less than 0.53, the introduction of SEBS‐g‐MA can improve the dispersion degree, leading the improvement of flame retardancy properties. However, with the increase of interfacial boundary thickness, the SEBS‐g‐MA coating around MH acted as a heat and mass transfer barrier, leading to the reduction of flame retardancy. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

氢氧化镁对氯化聚乙烯橡胶性能的影响

研究单独使用氢氧化镁及氢氧化镁／氯化石蜡／三氧化二锑并用阻燃体系对氯化聚乙烯橡胶（CM）性能的影响。结果表明，单独使用氢氧化镁，随着氢氧化镁用量的增大，CM硫化胶氧指数增大，但氢氧化镁用量过大，CM硫化胶物理性能明显下降；与单独使用氢氧化镁相比，达到相同的阻燃效果时，采用氢氧化镁／氯化石蜡／三氧化二锑并用阻燃体系的CM硫化胶物理性能较好；采用配方优化设计系统确定氢氧化镁、氯化石蜡和三氧化二锑的用量分别为66．3，4．7和11．8份时，CM硫化胶的阻燃性能和物理性能较好。     

Flame retardancy and mechanical properties of EVA nanocomposites based on magnesium hydroxide nanoparticles/microcapsulated red phosphorus

The flame retardancy and mechanical properties of ethylene vinyl acetate (EVA) polymer nanocomposite based on magnesium hydroxide (MH) nanoparticles with lamellar‐shape morphological structures and synergistic agent microcapsulated red phosphorus (MRP) have been studied by limiting oxygen index (LOI), cone calorimeter test (CCT), UL‐94 test, tensile strength (TS), and elongation at break (EB). Results showed that LOI values of lamellar‐like nanosized MH (50 × 350 nm²) samples were 1–7 vol. % higher than those of the common micrometer grade MH (1–2 μm) in all additive levels. When 1–3 phr MRP substituted for nanosized MH filler, LOI value increased greatly from original 37 to 55, and met the V‐0 rating in the UL‐94 test. The values of TS for MH nanoparticles composites increased from 10.4 to 17.0 MPa as additive loading levels increased from 80 to 150 phr, respectively, while the corresponding values for common micrometer MH composites decreased steadily from 9.7 to 7.1 MPa. Thermogravimetric analysis (TGA) and dynamic Fourier‐transform infrared spectroscopy (FTIR) results revealed two‐step flame‐retardant mechanism. First, MH particles decompose endothermically with the release of 30.1% hydration water in the 320–370°C temperature range. Second, MRP promote the formation of compact charred layers slowly in the condensed phase in the 450–550°C temperature range. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

不同无卤阻燃剂对PPO/HIPS合金性能影响研究

制备了不同质量比的聚苯醚/高抗冲聚苯乙烯(PPO/HIPS)合金材料,PPO/HIPS质量比为60∶40时合金的综合性能最佳。研究了不同无卤阻燃剂三苯基氧化膦(PX220)、PX220/三聚氰胺聚磷酸盐(MPP)及红磷阻燃剂(RPM650)对PPO/HIPS合金材料阻燃性能、力学性能及热性能的影响。结果表明:在添加相同质量阻燃剂的情况下,PX220/MPP复配阻燃剂可使PPO/HIPS合金材料具有较高的负荷变形温度和熔体质量流动速率,以及优异的阻燃性能和力学性能;无卤阻燃剂的加入使PPO/HIPS合金的初始分解温度降低,最大热失重速率峰值向低温区移动。     

Morphology and flame‐retardancy properties of ternary high‐impact polystyrene/elastomer/polystyrene‐encapsulated magnesium hydroxide composites

The effects of elastomer type on the morphology, flammability, and mechanical properties of high‐impact polystyrene (HIPS)/polystyrene (PS)‐encapsulated magnesium hydroxide (MH) were investigated. The ternary composites were characterized by cone calorimetry, mechanical testing, and scanning electron microscopy. Morphology was controlled with poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] (SEBS) triblock copolymer or the corresponding maleinated poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] (SEBS‐g‐MA). The HIPS/SEBS/PS‐encapsulated MH composites exhibited separation of the filler and elastomer, whereas the HIPS/SEBS‐g‐MA/PS‐encapsulated MH composites exhibited encapsulation of the filler by SEBS‐g‐MA. The flame‐retardant and mechanical properties of the ternary composites were strongly dependent on microstructure. The composites with an encapsulation structure showed higher flame‐retardant properties than those with a separation structure at the optimum use level of SEBS‐g‐MA. Furthermore, the composites with a separation structure showed a higher modulus and impact strength than those with an encapsulation structure. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

全程动态注塑对HIPS制品力学性能影响研究

在振频0-12 Hz,振幅0-0．28 mm的范围内,使用自主发明的电磁动态注塑机研究了振动参数的变化对 HIPS制品力学性能和冲击断面形态结构的影响。结果表明:制品的力学性能对振动参数的响应不完全是一个单调趋势,而是存在一个最佳的响应范围。电磁动态注塑机引入的全程动态注塑过程能够同时提高制品的拉伸性能和冲击性能,冲击强度和拉伸强度最大提高幅度分别为20％和14．4％。而制品的冲击断面微观结构也表明,全程动态注塑过程能有效改善HIPS制品的微观结构。     

氢氧化镁的表面处理研究

为了解决氢氧化镁与聚合物相容性不好等问题，表面改性是有效的途径之一。分别采用稀土偶联剂、硬脂酸钙偶联剂，以及其联合偶联剂，以干法和湿法对4种不同的氢氧化镁进行了表面包覆工作。包覆后的氢氧化镁真密度都有下降，而表观密度和灼烧失重都有所增加。通过对比得出了以稀土为偶联剂，采用干法对氢氧化镁进行处理得到的效果最好。     

Influence of gamma radiation on compatibilized LLDPE/magnesium hydroxide/sepiolite composites

The influence of gamma irradiation on the properties of compatibilized linear low‐density polyethylene/magnesium hydroxide (MH)/sepiolite composites has been investigated. Vinyl triethoxy silane and maleated polyethylene have been used as compatibilizers. The compatibilizing effect in the composites is confirmed by the Fourier transform infrared spectra, which showed the presence of additional chemical bonds, which are responsible for the enhanced polymer‐filler interaction. As a result, the miscibility of the polar additives into the nonpolar polymer matrix is enhanced. The scanning electron micrographs revealed that the additives are well embedded and uniformly dispersed in the polymer matrix without any voids. The known thermal decomposition temperature of MH (～ 350°C) is also increased in the compatibilized composites. In addition, 150 kGy irradiated composite showed a remarkable improvement of 37°C in the onset degradation temperature of unirradiated composite. Furthermore, the formation of radiation crosslinked structure in the composites also improved the mechanical properties of the composites. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013