POE和mPE增韧木塑复合材料的研究

采用废木粉填充高密度聚乙烯制备木塑复合材料,采用茂金属聚乙烯(mPE)和乙烯-辛烯共聚物(POE)对复合材料进行增韧,并阐述了它们的增韧机理,讨论了增韧剂用量对复合材料的力学性能如拉伸强度、弯曲强度、弯曲模量、冲击强度和硬度的影响,综合评价了两种冲击改性剂的增韧效果。研究结果表明:两者对高密度聚乙烯基木塑复合材料均有良好的增韧效果。单就增韧效果而言,POE优于mPE,但在其他性能如拉伸强度、弯曲强度、弯曲模量、硬度以及耐热性等方面,mPE明显优于POE。     

磷石膏/聚乙烯复合材料的制备及性能研究

采用熔融共混制备磷石膏(PG)/高密度聚乙烯(HDPE)复合材料.研究了 PG粒径、PG填充量和表面改性剂硬脂酸(SA)用量对PG/HDPE复合材料性能的影响.结果表明:当PG粒径为2.619 μm,PG填充量为20％,SA用量为2％时,PG/HDPE复合材料的综合性能最好,拉伸强度、弯曲强度、弯曲模量相较于纯HDPE...     

芦苇纤维/废旧聚乙烯复合材料的研究

采用芦苇纤维填充废旧聚乙烯,研究了芦苇纤维偶联处理、增容剂用量、芦苇纤维用量、芦苇纤维粒径大小对复合材料性能的影响。结果表明,偶联剂用量为芦苇纤维用量的1.3%(质量分数)左右、增容剂为15份时复合材料综合性能最佳,随芦苇纤维用量的增加和粒径的增大会使复合材料拉伸强度、冲击强度下降。     

陶瓷纤维填充聚烯烃复合材料的导热性能研究

制备了硅酸铝纤维、氧化铝纤维填充聚乙烯(PE)复合材料和硅酸铝纤维、氧化铝纤维填充聚丙烯(PP)复合材料：用稳态法考察了纤维用量对复合材料导热性能的影响。结果表明：硅酸铝纤维和氧化铝纤维填充PP、PE复合材料的热导率基本随纤维用量的增加而增加，在某些用量时稍有波动，纤维质量分数为35％的试样导热效果最好。     

陶瓷纤维填充聚烯烃复合材料的导热性能研究

制备了硅酸铝纤维、氧化铝纤维填充聚乙烯(PE)复合材料和硅酸铝纤维、氧化铝纤维填充聚丙烯(PP)复合材料；用稳态法考察了纤维用量对复合材料导热性能的影响。结果表明：硅酸铝纤维和氧化铝纤维填充PP、PE复合材料的热导率基本随纤维用量的增加而增加，在某些用量时稍有波动，纤维质量分数为35％的试样导热效果最好。     

木粉的碱化处理对木塑复合材料性能的影响

采用木粉填充高密度聚乙烯（HDPE）制备复合材料。为增强亲水性的木粉和憎水性的HDPE基质之间的化学亲和力,对木粉碱化处理。研究了相容剂用量和木粉的碱化处理对复合材料力学性能的影响。结果显示,马来酸酐接枝HDPE可明显提高复合材料的力学性能．表现出很好的增容效果：与用未碱化处理的木粉填充的复合材料相比,木粉的碱化处理使复合材料的弯曲强度和弯曲模量分别下降20．4％和36．2％：在不使用相容剂的情况下,木粉的碱化处理也会使复合材料的拉伸强度下降．但在使用适量相容剂后．则可使复合材料的拉伸强度从未处理时的30．3MPa提高到36．5MPa,与纯HDPE相比,拉伸强度提高了44.8％。     

聚乙烯热熔胶增容聚乙烯基木塑复合材料的研究

采用废木粉和高密度聚乙烯制备复合材料,并采用一种聚乙烯热熔胶作为相容剂以增进憎水性的聚乙烯基材和亲水性的木粉界面的相互作用。评价了该热熔胶的增容效果,并对其增容机理进行了详细论述。研究结果表明:该热熔胶的主要成分为马来酸酐接枝高密度聚乙烯(PE-HDg-MAH)和乙烯-醋酸乙烯酯共聚物(EVA);添加木粉有利于弯曲强度和弯曲模量的提高,但使冲击强度和拉伸强度迅速下降;该热熔胶可明显提高复合材料的力学性能,并且木粉的填充量越高,则增容作用就越明显;当木粉的用量为50％时,使用该热熔胶可使复合材料的拉伸强度、弯曲强度、弯曲模量和冲击强度分别提高115．6％、66．7％、38．1％和67％;基于这些结果可知,该热熔胶可显著提高聚乙烯基材／木粉界面处的亲和力,是聚乙烯基木塑复合材料理想的增容剂。     

高岭土与膨润土复配填充丁苯橡胶复合材料的性能

以高岭土与不同类型的膨润土JZ-PRT、Na-PRT和Ca-PRT复配,用硅烷偶联剂Si-69进行球磨改性,得到复配黏土K-JZPRT、K-Na PRT和K-Ca PRT,将其作为增强剂填充到丁苯橡胶(SBR)中,制备了复配黏土/SBR复合材料,用X射线衍射仪、傅里叶变换红外光谱仪以及冷场发射扫描电子显微镜对复配黏土及复合材料进行了表征,并考察了复合材料的加工性能、力学性能和气阻隔性能。结果表明,复配黏土中膨润土的特征衍射峰强度都有所降低,高岭土除d001衍射峰外,其他特征衍射峰强度都有不同程度的弱化。与填充K-JZPRT的SBR复合材料相比,填充K-Na PRT和K-Ca PRT的复合材料的硫化速率更快,门尼黏度更低,因而加工性能也更好。填充复配黏土的复合材料的力学性能和气阻隔性能较SBR均有明显改善,其中K-Na PRT的填充效果最好,拉伸强度增加了652%,透气率降低了43%。复配黏土在SBR基体中分散比较均匀,与橡胶分子的结合良好。     

受阻酚AO-60与CM复合材料的性能

以受阻酚AO-60为填充材料,考察了其用量对氯化聚乙烯（CM）弹性体/受阻酚复合材料耐老化性能、硫化特性、力学性能和分散性的影响。结果表明,随着受阻酚AO-60用量的增加,复合材料的耐老化性能变好,拉断伸长率降低。当AO-60用量为30份时,拉伸强度为16.7MPa;撕裂强度为38.5kN/m。由炭黑分散度测定仪观察,AO-60用量在30份以下时,分布效果较好;AO-60用量在50份以上时,与CM基体出现相分离。综合考虑,AO-60用量为30份时为宜。     

PVC/ABS复合材料的制备及增韧改性

分别采用乙烯–乙酸乙烯酯共聚物(EVAC)、氯化聚乙烯(CPE)和苯乙烯–丁二烯–苯乙烯共聚物(SBS)三种弹性体为增韧剂,研究增韧剂种类及用量对聚氯乙烯(PVC)/丙烯腈–丁二烯–苯乙烯塑料(ABS)复合材料冲击强度、拉伸强度和极限氧指数的影响,并对纳米CaCO_3填充改性PVC/ABS复合材料的力学性能、熔体流动速率和极限氧指数(LOI)进行探讨。结果表明,采用CPE增韧改性的PVC/ABS复合材料的力学性能和阻燃效果均优于EVAC和SBS改性体系;PVC/ABS/CPE/CaCO_3复合材料的缺口冲击强度在纳米CaCO_3用量为6份时达到极大值,随着纳米Ca CO3用量的增加,拉伸强度和弯曲强度逐渐下降,LOI有所降低,在纳米CaCO_3用量为4份时材料的加工流动性较好。     

HDPE/空心玻璃微珠复合材料性能研究

采用硝酸钕对空心玻璃微珠进行了表面改性,通过熔融共混挤出的方法,制备了空心玻璃微珠(HGB)质量分数不同的HDPE/HGB复合材料.研究了空心玻璃微珠对复合材料微观结构、力学性能和结晶性的影响.结果表明,经过硝酸钕表面改性的HGB与HDPE的相容性较好;随着HGB用量的增加,复合材料的拉伸强度、弯曲强度均表现出先增大后减小的趋势,断裂伸长率和冲击韧性逐步下降.结晶研究发现,HGB的加入提高了HDPE的结晶度,HGB用量低于10%时可以提升HDPE的结晶速率.     

硅烷偶联剂对HDPE/木粉复合材料性能的影响

使用经硅烷偶联剂HP-172和HP-174改性的木粉制备了HDPE/木粉复合材料,研究了偶联剂用量对其性能的影响。实验结果表明:当使用1.5%的HP-172处理木粉后,可使复合材料的各项力学性能提高30%以上;HP-174的用量为1%~1.5%也得到了较好的改性效果。通过FIR和SEM分析发现,硅烷偶联剂可与木粉表面发生化学反应,从而提高了HDPE与木粉的界面粘合强度,使复合材料的力学性能得以提高     

Influence of nanoclay on properties of HDPE/wood composites

Composites based on high density polyethylene (HDPE), pine flour, and organic clay were made by melt compounding and then injection molding. The influence of clay on crystallization behavior, mechanical properties, water absorption, and thermal stability of HDPE/pine composites was investigated. The HDPE/pine composites containing exfoliated clay were made by a two‐step melt compounding procedure with the aid of a maleated polyethylene (MAPE). The use of 2% clay decreased the crystallization temperature (T_c), crystallization rate, and the crystallinity level of the HDPE/pine composites, but did not change the crystalline thickness. When 2% MAPE was added, the crystallization rate increased, but the crystallinity level was further lowered. The flexural and tensile strength of HDPE/pine composites increased about 20 and 24%, respectively, with addition of 1% clay, but then decreased slightly as the clay content increased to 3%. The tensile modulus and tensile elongation were also increased with the addition of 1% clay. The impact strength was lowered about 7% by 1% clay, but did not decrease further as more clay was added. The MAPE improved the state of dispersion in the composites. Moisture content and thickness swelling of the HDPE/pine composites was reduced by the clay, but the clay did not improve the composite thermal stability. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Morphological,mechanical, tribological,and thermal expansion properties of organoclay reinforced polyethylene composites

The morphological, mechanical, thermal, and tribological properties of high‐density polyethylene (HDPE) composites reinforced with organo‐modified nanoclay (3 and 6 wt%) were studied. A commercial maleic anhydride‐based polymeric compatibilizer (PEgMA) was used to improve the adhesion between the polyethylene and clay. Transmission electron microscopy (TEM) characterization of composites revealed that nanoclay exists mainly in a multilayered structure in the HDPE matrix. Mechanical testing of composites showed that Young's modulus and tensile strength increased with nanoclay content. Coefficients of the linear thermal expansion (CLTE) of HDPE–PEgMA–clay composites were slightly lower in the flow direction than those of HDPE–PEgMA. The tribological properties were measured in dry conditions against a steel counterface. The friction coefficient of the matrix was decreased by the addition of clay. Electron microscopic results suggested that the wear mechanism for HDPE and HDPE composites was mainly adhesive. Clay agglomerates were observed on the worn surfaces of the composites, which may partly explain decreased friction. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers     

Mechanical,dynamic mechanical,and thermal characterization of fly ash and nanostructured fly ash‐waste polyethylene/high‐density polyethylene blend composites

Disposal of polyethylene used as carry bags is the greatest challenge increasing day by day. Composite materials were prepared by mixing Fly ash (FA) and nanostructured fly ash (NFA) from thermal power station as filler and blends of Waste polyethylene (WPE)(carry bags) collected from municipal solid waste (MSW) with virgin high‐density polyethylene (HDPE) as matrix. Different modifications were induced to improve the overall properties of these composites. At first, the WPE/HDPE blend matrix was modified by grafting with maleic anhydride (MA) and the composite prepared with FA/NFA. Then, the WPE/HDPE‐FA/NFA composite as a whole was treated with electron beam irradiation at 250 kGy radiation dose and finally the FA/NFA filler was treated with radiation dose of 250 kGy and the composite prepared. Significant enhancement in tensile strength, flexural strength, flexural modulus, and hardness are observed for MA modified and irradiated composites, the increase being more prominent in irradiated composites. Furthermore, an increase in storage/loss moduli with enhanced thermal stability was observed with the addition of FA/NFA and upon modifications. The analysis of the tensile fractured surfaces by scanning electron microscopy was in well correlation with the mechanical properties obtained. In summary, after analyzing the effects of the three different modifications on mechanical, dynamic mechanical and thermal properties, the irradiation on to the WPE/HDPE‐FA/NFA composites investigated was selected as the most appropriate for future applications. POLYM. COMPOS., 37:3256–3268, 2016. © 2015 Society of Plastics Engineers     

POE/HDPE/PP三元复合材料的形貌和力学性能研究

用熔融共混法制备了高密度聚乙烯/聚丙烯(HDPE/PP)和乙烯-辛烯弹性体/高密度聚乙烯/聚丙烯(POE/HDPE/PP)复合材料。通过冲击、弯曲和拉伸测试研究了复合材料的力学性能,采用扫描电镜(SEM)观察了材料的形貌。结果表明,由于HDPE和PP的相容性有限,限制了HDPE对PP综合力学性能的提高;通过添加POE,能改善HDPE/PP共混物的相容性,使HDPE/PP复合材料在保持较高弯曲和拉伸性能的前提下,抗冲击性能获得明显提高。当HDPE/PP的含量比为12/88和POE含量为8wt%时,POE/HDPE/PP三元复合材料的综合力学性能较好。     

Mechanical Properties of High Density Polyethylene/Modified Calcium Silicate Composites

High density polyethylene (HDPE)/calcium silicate (CS) composites containing vinyltriethoxysilane treated calcium silicate contents varying from 0–10 phr were prepared by injection molding. Thus obtained HDPE/CS composites were characterized by the thermal analyses. The mechanical properties were evaluated. It was found that the incorporation of the calcium silicate into high density polyethylene resulted in a slight increase in the yield stress (6.85–11.76 %) as well as tensile strength (7.02–12.84 %). However, the elongation at yield and the elongation at break decreased by 9.23–24.87 % and by 11.03–60.73 %, respectively, with the increasing calcium silicate content. The vinyltriethoxysilane modified CS exhibited the dispersibility in HDPE matrix arising from the compatibility between high density polyethylene matrix and the disperse phase (treated calcium silicate particles) which led to the effect on the mechanical properties of the composites. It could be concluded that the modified calcium silicate played a role in reinforcing the mechanical properties into the high density polyethylene.     

偶联剂对nano-ZnO/HDPE复合材料性能的影响

通过熔融共混法制备出不同硅烷偶联剂(KH550,KH560)改性的nano-ZnO/HDPE复合材料,并考察了偶联剂及ZnO含量对复合材料性能的影响。结果表明:改性nano-ZnO对HDPE基体起到了明显的增强增韧的效果,当改性nano-ZnO含量为0.2%～0.5%时,复合材料的力学性能最好。此外,nano-ZnO在HDPE中起异相成核剂的作用,从而使体系的熔融温度、结晶温度和结晶度升高。经KH560处理的nano-ZnO/HDPE复合材料的力学性能和结晶性能均优于经KH550处理的nano-ZnO/HDPE复合材料的性能。     

管材用回收高密度聚乙烯/胶粉复合材料的研究

采用一步法活化增容制备了回收高密度聚乙(烯RHDPE/)胶粉管材专用料,并研究了引发剂过氧化二异丙苯强度从37.5 kJ/m2提高到48 kJ/m2;弯曲强度从10.5 MPa提高到12.9 MPa;弯曲模量从356 MPa提高到405(DCP)、接枝单体马来酸酐(MAH用)量对体系力学性能的影响。结果表明:当DCP、MAH用量分别为0.1份、1.0份时,RHDPE/胶粉体系获得最佳的力学性能,与简单共混物比较,拉伸强度从18.8 MPa提高到23.8 MPa;缺口冲击MPa。通过流变性能测试结果和扫描电(镜SEM)照片分析活,化增容对RHDPE/胶粉体系有效。     

HDPE/功能化石墨烯复合材料制备及性能研究

氧化石墨烯(GO)具有较高的比表面积,层间距大,表面拥有丰富的官能团,可以很好地分散到聚合物中,但GO导电性差。研究对GO进行还原和表面修饰,以改善石墨烯和HDPE的相容性。采用熔融混炼法制备了HDPE/石墨烯复合材料,结合力学性能、导电性能、微观结构测试,考察不同HDPE/石墨烯复合材料的导电阈值,分析影响复合材料导电性的因素,进而得出较优化的制备工艺。研究发现石墨烯添加量为7.5%时,导电通路开始形成,当石墨烯含量达到7.5%时,拉伸强度提升22.14%,拉伸模量提升21.19%。