PP-g-Si对PP／GF的增容作用

制备了硅烷接枝聚丙烯(PP-g-Si)，研究了PP-g-Si作为聚丙烯／玻纤(PP／GF)复合体系的界面相容剂对界面结合和力学性能的影响，并与马来酸酐接枝聚丙烯(PP-g-MAH)的增容效果进行了比较。结果表明，PP-g-Si对PP／GF体系有增容作用，不仅可以改善PP／GF复合体系的拉伸强度，而且可以改善其韧性。硅烷接枝聚丙烯可以降低PP／GF复合体系的最大扭矩。玻纤的加入可以提高聚丙烯的热变形温度，硅烷接枝聚丙烯对PP／GF复合体系的热变形温度有稍微改善。扫描电镜观察表明，玻纤与基体间具有强有力的界面结合，硅烷接枝聚丙烯的增容效果优于马来酸酐接枝聚丙烯。     

硅烷偶联剂对玻纤/聚丙烯复合材料的影响

分别选用KH550、KH570两种硅烷偶联剂处理无碱无捻粗纱,采用挤出、注塑成型技术制备玻纤增强聚丙烯复合材料,对复合材料进行了分析和研究。结果表明：硅烷偶联剂具有提高GF/PP复合材料性能的作用。SEM显示KH570处理GF与PP基体之间形成了良好的界面,界面层起到很好的应力传递作用,达到良好的增强效果。     

GF对微发泡PP/GF复合材料力学性能影响

将经过改性的玻璃纤维(GF)以不同的含量加入到聚丙烯(PP)中,在二次开模条件下制备微发泡PP/GF复合材料,分析了不同含量GF对微发泡PP复合材料力学性能的影响。结果表明,GF具有明显的填充增强作用,当GF质量分数为20%时,微发泡PP复合材料的拉伸强度达到50.24 MPa,比未发泡纯PP的提高了59.5%;微发泡材料的冲击强度为7.37kJ/m2,发泡后材料的冲击强度与纯PP的相比提高了93.9%;发泡后材料密度相对于未发泡的显著下降。     

GF/PP混纤纱及其复合材料性能初探

通过实验,对混纤纱制备热塑性复合材料进行了相关的工艺探索,并对试样进行了测试。结果表明,采用混纤纱法制备的热塑性复合材料制品的综合力学性能比SFT、LFT、GMT均优异,仅次于Twintex。随着玻纤含量的提高,混纤纱的拉伸强度、拉伸模量均明显提高,而弯曲强度和弯曲模量则呈现出先升后降的趋势。试验指出了存在的有关原材料本身和混纤工艺存在的问题,并提出了解决方法和今后的研究方向。     

硅烷偶联剂的应用进展

简要介绍了硅烷偶联剂的偶联机理、选用原则及其在复合材料中的应用，包括用作玻璃纤维的处理剂、无机粉末填料的处理剂和胶粘剂、密封剂的增粘剂；另外，还介绍了硅烷偶联剂对橡胶性能的影响。     

GF增强PP复合材料的尺寸稳定性与力学性能

研究了马来酸酐接枝聚丙烯(PP-g-MAH)含量及玻璃纤维(GF)含量对GF增强聚丙烯(PP)复合材料尺寸稳定性与力学性能的影响。结果表明,加入PP-g-MAH后,复合材料的线性膨胀系数和收缩率下降,结晶度、拉伸强度、弯曲强度和悬臂梁缺口冲击强度提高,但断裂伸长率下降。相比不添加PP-g-MAH的复合材料,当PP-g-MAH质量分数达到6%时,复合材料在流道方向上的线性膨胀系数从29.88μm/(m·℃)降低至24.93μm/(m·℃),在流道方向上的收缩率从0.20%下降至0.18%,拉伸强度、弯曲强度和悬臂梁缺口冲击强度基本达到最大值,分别提高130.18%,96.52%和49.20%;随着GF质量分数的增加,复合材料的线性膨胀系数和收缩率均显著下降,拉伸强度、弯曲强度和悬臂梁缺口冲击强度提高,而断裂伸长率和结晶度下降。相比不添加GF的复合材料,当GF质量分数为40%时,复合材料在流道方向上的线性膨胀系数从101.30μm/(m·℃)降低至18.08μm/(m·℃),在流道方向上的收缩率从1.43%下降至0.08%,结晶度从45.05%下降至23.96%,拉伸强度、弯曲强度和悬臂梁缺口冲击强度分别提高168.87%,306.40%和129.52%。     

Polypropylene–intumescent flame‐retardant composites based on meleated polypropylene as a coupling agent

The phosphoric acid‐pentaerythritol‐melamine copolymer, which is composed of three main components of intumescent flame retardant (IFR) and has optimal intumescent degree, was selected as IFR. The influence of meleated polypropylene (PP‐g‐MAH) on the properties and compatibility of IFR polypropylene (PP) composites were studied. The results obtained from mechanical tests, rheological behavior of composites, and scanning electron microscope showed that PP‐g‐MAH was a true coupling agent for IFR/PP blends and did not change the necessary flame retardancy. The cocrystallization between bulk PP and PP segments of PP‐g‐MAH was also proven by WAXD analysis. Flow test showed that the flow behaviors of composites in the melt are those of a pseudoplastic and it is very small for PP‐g‐MAH affecting rheological behavior of the PP/IFR composite. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 257–262, 2002     

聚丙烯/玻纤缠绕复合管的制备与应用

以聚丙烯管为内衬，表面经处理后，缠绕浸胶玻纤，形成独特的聚丙烯／玻纤缠绕复合管。该复合管材的轴向拉伸强度、轴向压缩强度和界面剪切强度分别大于130MPa、150MPa及8MPa。实际使用表明，该复合管具有良好的耐化学药品性、耐热性，力学强度高，密度小，而且施工简便，使用寿命长，可代替不锈钢等金属管。     

复配增容剂增容PPO/PP/GF研究

研究复配增容剂(SEPS/PP-g-MAH)对玻璃纤维(GF)增强聚苯醚(PPO)/聚丙烯(PP)力学性能、熔体流动性以及耐热性能的影响,并用扫描电子显微镜观察了不同共混体系的形态结构.结果表明,复配增容剂改善了PPO/PP/GF共混体系的相容性,提高了共混体系的拉伸强度、弯曲强度、冲击强度和熔体流动速率,但同时降低了...     

Effect of silane‐grafted polypropylene on the mechanical properties and crystallization behavior of talc/polypropylene composites

Talc‐filled polypropylene (PP) composites coupled with silane‐grafted polypropylene (PP‐g‐Si) were prepared. Effect of PP‐g‐Si on the mechanical properties, crystallization, and melting behavior of PP composites was investigated. Compared with the uncoupled composites, the mechanical properties of Talc/PP composites coupled with a small amount of PP‐g‐Si were increased to some extent. Meanwhile, PP‐g‐Si can promote crystallization rate and increase crystallization temperature of PP in the composites. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2974–2977, 2000     

Effects of rice husk (RH) particle size,glass fiber (GF) length,RH/GF ratio,and addition of coupling agent on the mechanical and physical properties of polypropylene‐RH‐GF hybrid composites

Polypropylene (PP) hybrid composites based on rice husk (RH) with different particle size and glass fiber (GF) with different length were prepared. The composites were subjected to mechanical and water immersion tests. From the results obtained, it was found that the mechanical properties of the hybrid composites were strongly dependent on the size of RH particle and length of GF. It could be further enhanced with the presence of coupling agent. In this study, two types of coupling agents, i.e., Epolene E‐43 (E‐43) and 3‐(trimethoxysilyl)‐propylmethacrylate (TPM), were employed. In general, E‐43 imparted significant improvement in the mechanical properties. From the water immersion results, it was found that the hydrophobicity of the composites was increased with the presence of coupling agent. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

硅烷偶联剂改性玻璃纤维增强硅气凝胶的研究

为了达到增强硅气凝胶力学性能的目的,采用硅烷偶联剂KH550与KH560二步改性接枝玻璃纤维,进而制备纤维增强硅气凝胶。利用扫描电子显微镜、红外光谱仪、比表面及孔径分布仪、热重-差热分析仪、导热系数仪、电子动静态疲劳试验机等对其表征。实验结果表明：硅烷偶联剂改性玻璃纤维与硅气凝胶复合后网络结构更加均匀、骨架强度更加稳定、孔径多在30 nm以下、具有良好的热稳定性;同时,改性玻璃纤维的最佳添加量为20%（质量分数）,此时其密度为0.167 g/cm³,导热系数为0.018 5 W/（m·K）,接触角为127°,抗弯强度为1.042 MPa,抗压强度为0.669 MPa,达到预期实验目的。     

MAH—g—PP孚L液对PP／GF复合材料界面的影响

利用自制的MAH—g—PP乳液和KH-550溶液组合进行玻纤的表面处理。考察了MAH—g—PP乳液和KH-550溶液处理对PP／GF界面粘结的影响,研究了MAH—g—PP乳液处理玻纤表面的适宜温度和时间,探讨了MAH—g—PP乳液对PP／GF的偶联机理。结果表面：玻纤表面经MAH—g—PP乳液和KH-550溶液处理后,在PP／GF界面上形成了牢固的化学键连接,出现了明显的横晶层;MAH—g—PP乳液处理玻纤表面的适宜温度和时间为105℃、1h;MAH—g—PP乳液对PP／GF的偶联机理为乳液中的羧基与玻纤表面KH-550的氨基发生化学键合。     

Effect of a silane coupling agent on the properties of white rice husk ash–polypropylene/natural rubber composites

White rice husk ash (WRHA)–polypropylene (PP)/natural rubber (NR) composites were prepared using a Brabender Plasticorder at 180 °C and a rotor speed of 50 rev min^?1. The mechanical and water‐absorption properties were studied. The incorporation of WRHA into the PP/NR matrix has resulted in the improvement of the tensile modulus; however, the tensile strength, elongation at break and stress at yield decreased with increasing WRHA loading. Poor filler matrix interactions are believed to be responsible for the decrease in the properties. Incorporation of a silane coupling agent, 3‐aminopropyl triethoxysilane (3‐APE), improved tensile modulus, tensile strength and stress at yield of the composites. Water‐absorption studies indicate that the use of the coupling agent reduced the amount of water absorbed by the composites. © 2001 Society of Chemical Industry     

偶联剂对白炭黑／SBR复合材料力学性能的影响

研究了4种偶联剂KH-550、KH-792、WD-60和HG-305对白炭黑／SBR复合材料力学性能和热空气老化性能的影响。研究结果表明：当KH-550用量为4．0份时,复合材料的综合力学性能最好,与未改的白炭黑／SBR复合材料相比,其拉伸强度和撕裂强度分别提高了77％和24％;复合材料的老化实验结果表明,经偶联剂改性的复合材料的耐热老化性能有所下降,其中HG-305改性的复合材料抗老化性较好。     

玻璃纤维增强聚丙烯复合材料研究进展

对玻璃纤维增强聚丙烯复合材料的研究近况进行了简单介绍,对其界面改性、增韧增强、结晶行为、长切玻璃纤维增强、材料性能及成型工艺条件进行了较详细的讨论,并对该复合材料今后的研究进行了展望。     

GF表面的多步接枝改性及其对PP/GF复合材料拉伸性能的影响

为提高热塑性树脂聚丙烯(PP)与玻璃纤维(GF)之间的界面相容性和粘结强度,提出了一种对GF三步浸渍的方法,将GF逐步用(3-氨丙基)三乙氧基硅烷(γ–APS),1,6-己二异氰酸酯(HDI)及苄胺或十八胺处理,从而在GF表面接枝上长的分子链。利用接触角测定仪、衰减全反射傅立叶变换红外光谱(ATR–FTIR)仪和X射线光电子能谱(XPS)仪等手段,对改性后的GF表面进行了表征,证明了接枝反应的成功进行。将不同方法改性的GF与PP制备成单向PP/GF复合材料,对其进行了拉伸性能测试。结果表明,随着GF表面接枝的碳链增长,复合材料的拉伸强度逐渐增大。     

POE-g-Si对PP/木粉复合材料结构和性能的影响

以硅烷接枝乙烯-1-辛烯共聚物(POE-g-Si)为增容剂,制备了聚丙烯(PP)/POE-g-Si/木粉复合材料。研究了POE-g-Si对PP/木粉复合材料的晶态结构、界面相容性、动态力学性能及力学性能的影响。加入POE-g-Si有效改善了复合材料的界面相容性;PP中β晶型消失,结晶度由71.50%降至61.91%,木粉与基体界面处出现横晶;α,β转变峰均增强;复合材料拉伸强度、抗冲击性能均明显提高。     

硅烷偶联剂KH-550对IIR/炭黑N220/白炭黑纳米复合材料性能的影响

研究硅烷偶联剂KH-550对IIR／炭黑N220/白炭黑纳米复合材料的硫化特性、物理性能、动态性能及压缩模量的影响。扫描电子显微镜照片显示，硅烷偶联剂KH-550能较好地增强白炭黑与橡胶大分子之间的键合。试验表明，硅烷偶联剂KH-550可使纳米复合材料的MH增大。t10缩短,t90延长；当用量为3份时。纳米复合材料的物理性能最佳。其tanδ值减小，E’和E^N增大；纳米复合材料的压缩模量随硅烷偶联剂KH550用量的增大而增大。     

硅烷偶联剂对氢氧化镁表面改性及其在聚丙烯中的应用

选用具有相同亲水基团的4种硅烷偶联剂对工业级氢氧化镁进行常温湿法表面改性,并与聚丙烯(PP)熔融混合制得掺杂氢氧化镁质量分数为35%的复合材料,以SEM,FT-IR等手段对氢氧化镁及复合材料进行表征,考察了不同硅烷对复合材料阻燃性能和力学性能的影响。结果表明,硅烷偶联剂湿法改性可以提高氢氧化镁的分散性和与材料的相容性,改善氢氧化镁/PP的力学性能,但对阻燃性能影响不大;十二烷基三甲氧基硅烷在水相中稳定性好,可以较多地包覆于氢氧化镁表面,改性后材料的悬臂梁缺口冲击强度提高50%,断裂伸长率提高6倍,达到很好的改性效果。