木粉含量对PE基木塑挂墙板性能的影响

以木粉和废HDPE为主要原料,用挤出成型的方法制备木塑挂墙板,试验研究了木粉含量对木塑挂墙板性能的影响。通过性能测试和断面SEM分析,结果表明:随着木粉含量的增加,弯曲模量逐渐增加,弯曲强度和落锤冲击高度先增加后降低,在木粉含量为54%时达到最大值;木粉含量增加,吸水率明显增加,但木粉分散性和耐磨性变差。     

棉花秸秆/聚乙烯木塑材料的制备

以棉花秸秆为植物纤维来源,采用普通相容剂和含稀土相容剂制备木塑材料,使用红外和热分析对相容剂的结构进行分析,比较两种相容剂对棉花秸秆/聚乙烯木塑材料性能的影响.结果表明:采用含稀土的相容剂制备木塑材料中棉花秸秆粉的添加量可达到200份,而且木塑材料的拉伸强度、冲击强度、弯曲强度均高于纯树脂.扫描电镜照片显示:稀土相容剂可以改善棉花秸秆和PE的相容性.     

相容剂改性竹粉基木塑复合材料

比较了MA-g-LDPE和MA-g-EVA两种相容剂对木塑复合材料的性能影响效果。结果表明:当马来酸酐接枝物的加入量为10～15份时,木塑复合材料的综合性能最好。利用MA-g-LDPE改性时,复合材料的拉伸强度、弯曲强度和耐热性较好,而利用MA-g-EVA改性时,复合材料在冲击强度、流动性和耐水性方面则提高较多。     

一种高性能木塑墙板的制备及性能研究

以陶瓷纤维为填料,添加到PE基木塑材料(WPC)中,制备了高性能木塑墙板。与不添加陶瓷纤维的木塑墙板相比,添加陶瓷纤维的木塑墙板其冲击强度增加147.54%,拉伸强度增加43.24%,三点弯曲强度增加76.28%,四点弯曲强度增加79.07%,陶瓷纤维的适宜添加量为10~14份,PE树脂最佳用量为31~34份。     

MAPE含量对PE木塑复合材料冲击强度的影响

以高密度聚乙烯(PE-HD)和马来酸酐接枝聚乙烯(MAPE)共混物为塑料基体,以木粉(WF)为填料,采用压制成型法制备了木塑复合材料。研究了MAPE含量对塑料基体和木塑复合材料冲击强度的影响。结果表明,MAPE含量对MAPE/PE-HD塑料基体和木塑复合材料的冲击强度影响显著;保持MAPE和PE-HD的总含量不变时,当木粉含量为30 %时,木塑复合材料的冲击强度随MAPE含量的增大而逐渐减小;当木粉含量为70 %时,木塑复合材料的冲击强度随MAPE含量的增加而逐渐增大。     

聚合物／甘蔗渣复合材料研究进展

甘蔗渣是一种可再生的生物资源,将其与聚合物共混制备木塑复合材料则是当代甘蔗渣高值化利用的发展方向之一。系统地介绍了甘蔗渣的预处理技术、加工温度和甘蔗渣加入量等因素对聚合物／甘蔗渣复合材料性能的影响。在制备复合材料的过程中除了要注重甘蔗渣的加入量和预处理方法外,还要着重选择良好的相容剂和不同的改性方法,才能改善甘蔗渣与聚合物的相容性,充分展现甘蔗渣在木塑复合材料中的优势。     

界面相容剂对HDPE/黄麻纤维复合材料性能的影响

研究了马来酸酐接枝聚乙烯(MAPE)、γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)及γ-甲基丙烯酰氧基丙基三甲氧基硅烷接枝聚乙烯(KH-g-PE)三种界面相容剂对高密度聚乙烯(HDPE)/黄麻纤维复合材料的力学性能和耐水性的影响;考察了MAPE的用量对复合材料拉伸性能的影响;并用扫描电子显微镜对拉伸断口形貌进行了观察.结果表明:添加界面相容剂后,复合材料的拉伸性能和耐水性均有不同程度的提高.其中,大分子偶联剂MAPE和KH-g-PE的加入使复合材料的拉伸强度提高更为明显.     

塑料基体中MAPE/HDPE比例对木塑复合材料力学性能的影响

以高密度聚乙烯(HDPE)和马来酸酐接枝聚乙烯(MAPE)共混物为塑料基体,以木粉为填料,用注塑成型法制备木塑复合材料,研究MAPE/HDPE质量比变化对塑料基体和木塑复合材料力学性能的影响.结果表明:MAPE/HDPE比变化对MAPE/HDPE共混形成的塑料基体强度基本没有影响,但对由该共混物所制得的木塑复合材料的强度影响显著;在相同的木粉含量下,保持配方中MAPE和HDPE的总含量不变,木塑复合材料的拉伸强度随MAPE/HDPE比率增大先迅速增加,然后趋于平缓.冲击强度随MAPE/HDPE比增大逐渐减小.     

芦竹/聚丙烯木塑复合材料的制备

研究了芦竹粉目数、相容剂用量和存放时间对芦竹/聚丙烯木塑复合材料力学性能和吸水率的影响。结果表明:选择80目新的芦竹粉且使用量为50%、相容剂用量为6%时木塑复合材料的性能最好。在纤维用量相同时,采用芦竹粉制备的木塑复合材料的性能比采用杂木粉、水稻秸秆粉制备的木塑材料的性能要好。     

木塑复合材料的力学性能、微观结构与流变性能的研究

以高密度聚乙烯(HDPE)和木粉为原料制备了木塑复合材料。研究了木粉、相容剂含量对木塑复合材料力学性能、流变性能及微观结构的影响。结果表明:木粉含量的增加,可提高复合材料的刚性、熔体黏度以及剪切敏感性,但韧性有所降低;而添加适量的相容剂改善了复合材料的界面微观结构,从而改善了木塑复合材料的力学性能,而且还在一定程度上改善了复合材料的加工流动性。     

Effects of silane and MAPE coupling agents on the properties and interfacial adhesion of wood-filled PVC/LDPE blend

Composite samples were prepared from Poly(vinyl chloride)/low-density polyethylene (PVC/LDPE) blend, compatibilized by PA20 (methyl methacrylate-co-butyl acrylate copolymer), and reinforced by different levels of rubber-wood sawdust. To improve the mechanical properties of the composites, Silane A-137 (Octyltriethoxy silane), Silane A-1100 (γ-aminopropyltriethoxy silane), or MAPE (maleic anhydride-grafted-polyethylene) were introduced. It was found that the additions of Silane A-137, Silane A-1100, and MAPE could improve tensile and impact properties of the composites, regardless of the sawdust contents. Physical or chemical interactions for all coupling agents with the wood-PVC/LDPE composites used were proposed in this work. Silane A-137 or MAPE tended to give better improvement in the mechanical properties of the composites than Silane A-1100, because of the presence of the nonpolar chain ends of Silane A-137 or MAPE molecules. Besides, the addition of either Silane A-137 and MAPE or Silane A-1100 and MAPE at different ratios into the wood-PVC/LDPE composites was also studied. The experimental results suggested that the optimum mechanical properties could be obtained using Silane A-137 : MAPE of 1% : 2% wt sawdust. The morphological and thermal properties of the composites were also examined using SEM and DMA techniques, respectively. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

油茶果壳对PE-HD力学性能的影响

以废弃油茶果壳和高密度聚乙烯(PE-HD)为原料,采用挤出成型工艺制备了PE-HD/油茶果壳复合材料.采用热重法测试了油茶果壳的热稳定性,研究了油茶果壳平均粒径、添加量及相容剂马来酸酐接枝聚乙烯(MAPE)添加量对复合材料力学性能的影响.结果表明,油茶果壳初始热解温度为211℃,热解残炭率达31.35％.随着油茶果壳平...     

Effect of Coupling Agent Concentration,Fiber Content,and Size on Mechanical Properties of Wood/HDPE Composites

In this study, the influence of coupling agent concentration (0 and 3 wt%), wood fiber content (50, 60, 70, and 80 wt%), and size (40–60, 80–100, and 160–180 mesh) on the mechanical properties of wood/high-density-polyethylene (HDPE) composites (WPCs) was investigated. WPC samples were prepared with poplar wood-flour, HDPE, and polyethylene maleic anhydride copolymer (MAPE) as coupling agent. It was found that the tensile properties and the flexural properties of the composites were improved by the addition of 3 wt% MAPE, and the improved interfacial adhesion was well confirmed by SEM micrographs. It was also observed that the best mechanical properties of wood/HDPE composites can be reached with larger particle size in the range studied, while too-small particle size was adverse for the mechanical properties of wood/HDPE composites. Moreover, the tensile modulus, tensile strength, and flexural strength of WPCs decreased with the increase in fiber content from 50 to 80 wt%; the flexural modulus of WPCs increased with the increase in fiber content from 50 to 70 wt% and then decreased as the fiber content reached 80 wt%. The variances in property performance are helpful for the end-user to choose an appropriate coupling agent (MAPE) concentration, wood fiber content, and particle size based on performance needs and cost considerations.     

Evaluation of wood composite additives in the mechanical property changes of PE blends

Maleated polyethylene (MAPE) and dicumyl peroxide (DCP) are both popularly used in polyethylene‐based composites combining with organic fillers such as natural fibers and inorganic fillers such as nanoclay. Systematic studies were undertaken to investigate the influences of MAPE and DCP on the mechanical properties and plasticity of PE composites with or without natural fibers. In addition, the effect of the fiber adding sequence was examined to obtain superior mechanical properties. POLYM. COMPOS., 36:287–293, 2015. © 2014 Society of Plastics Engineers     

Optimal formulation of rice husk reinforced polyethylene composites for mechanical performance: A mixture design approach

Rice husk (RH) and linear medium density polyethylene (LMDPE) were used along with maleic anhydride grafted polyethylene (MAPE) to study the effects of component composition on the mechanical properties of the composites. Ten different blends along with four replicated blends were prepared with different selected percentages of RH, MAPE and LMDPE using mixture design approach. Trace and contour plots were used to examine the effects of RH, MAPE and LMDPE on the mechanical properties of the manufactured composites. Regression coefficients were also estimated for each fitted response (mechanical property). The results show that tensile and flexural properties of the composites improved with an increase in amount of RH, whereas Charpy impact strength decreased with increasing fibre loading. Tensile strength, flexural strength and Charpy impact strength increased with an increase in MAPE loading up to a certain percentage of MAPE, beyond which any further increase decreased these properties. The effect of MAPE on tensile and flexural modulus was not significant. The fitted models were used to optimise formulation of RH, MAPE and LMDPE for multiple responses for overall “best” mechanical properties. The optimal formulation for the overall “best” mechanical properties were found to be 50 wt% for RH, 4.1 wt% for MAPE and 45.9 wt% for LMDPE. The mechanical properties of the composite manufactured with this formulation closely matched the values predicted by the models. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40647.     

Rigid cellular PVC—the next house siding material?

The technology for extruding rigid cellular PVC has grown substantially over the past decade. Formulation additives, tooling, and processing expertise have made possible a variety of applications—relatively complex profiles, foam-core pipe, thermoformable foam sheet, and house siding. In the U.S. market, vinyl house siding is typically a relatively thin extrusion that is folded into a final shape that resembles wood cladding in appearance. An alternative to conventional form vinyl siding could be a foam structure that is thicker and stiffer than the solid form, and with a density similar to that of wood. This paper presents several performance advantages of rigid cellular PVC cladding in comparison to the current solid product, in addition to mentioning certain limitations that exist in the foam product that is produced with the technology available today.     

Superior balance of weatherability and impact performance with acrylic‐capped vinyl siding

Vinyl siding, particularly in darker colors, has to be durable and be able to retain most of its original color when exposed outdoors. As the color palette for vinyl siding has been expanding and more and more colors are being offered to the homeowner, the need exists to improve color hold. A new acrylic capstock polymer, based on core‐shell technology, which can be coextruded onto vinyl siding, has been shown to provide excellent color retention, with good processability, impact and impact retention, and suitable gloss. The properties of this new capstock polymer are compared to other choices for capping vinyl siding. J. VINYL ADDIT. TECHNOL., 13:26–30, 2007. © 2007 Society of Plastics Engineers.     

Effect of glass fiber on the electrical resistivities of polyoxymethylene/maleic anhydride‐grafted polyethylene/multiwalled carbon nanotube composites

The effect of glass fiber (GF) on the electrical resistivities of polyoxymethylene (POM)/maleic anhydride‐grafted polyethylene (MAPE)/multiwalled carbon nanotube (MWCNT) composites is investigated. The POM/MAPE/MWCNT composites at a MWCNT loading of 0.75% are nonconductive because most of MWCNTs are isolated in the MAPE islands, and their electrical resistivities decrease significantly after the addition of GF because of the formation of MAPE‐coated GF structure, which facilitates the formation of conductive paths and was confirmed by field emission scanning electron microscopy (FESEM). The formation of MAPE‐coated GF structure is attributed to the interaction between GF and MAPE during melt compounding, as contrasted by the uncoated GF using high‐density polyethylene (HDPE) instead of MAPE. Nonconductive POM/5–20% MAPE/0.75% MWCNT composites become conductive upon the addition of 20% GF. This preparation method for conductive materials can be generalized to POM/5–20% maleic anhydride‐grafted polypropylene (MAPP)/0.75% MWCNT composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41794.     

Effect of compatibilizing agents on the mechanical properties of high‐density polyethylene/olive husk flour composites

The main objective of this research was to investigate the effect on the thermal and mechanical properties of the addition of two different compatibilizing agents, malefic anhydride‐grafted polyethylene (PE) [synthesized in a solution state (MAPE) and commercial (XA255)], to olive husk flour, high‐density polyethylene (HDPE) composites. The composites contain 30 wt % of olive husk flour and a variable proportion of compatibilizer (3, 5, and 7 wt %). The grafting reaction was followed by Fourier transform infrared, and the grafting degree was evaluated by means of titration. The effect of grafting on the thermal properties of MAPE was observed by ATG/DTG. The mechanical and thermal properties of the composite were investigated. A morphological study of the composite reveals that there is a positive effect of compatibilizing agent on interfacial bonding. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Effects of different filler types on decay resistance and thermal,physical, and mechanical properties of recycled high-density polyethylene composites

In this study, flexural properties, impact strength, thermal performance, water absorption, biological durability, and morphology of wood-plastic composites (WPCs) filled with different filler types were investigated. Six different formulations of WPCs were fabricated from mixtures of carpenter waste and recycled high-density polyethylene (R-HDPE). The carpenter waste was derived from wood and particle board wastes, and R-HDPE was used as the polymer matrix, with and without addition of maleic anhydrite grafted polyethylene (MAPE). All formulations were compression moulded in a hot press for 3 min at 170 °C. Investigations on the compression moulded specimens revealed that water absorption values in the particleboard waste flour specimens were lower than in the wood-waste flour WPCs. However, the wood-waste flour-filled composites exhibited higher mechanical property values than the particleboard waste flour WPCs. Statistically, only the wood-waste flour-filled composites with MAPE were significantly different. The use of MAPE (3 wt%) had a positive effect on the water absorption, crystallinity degree, and flexural properties of the WPCs. In addition, the peak temperatures of the composites did not show any variation, while thermal decomposition of the composites showed minor variations under the thermogravimetric analysis. Furthermore, the decay resistance of the composites improved with the use of particleboard waste flour. The obtained results demonstrate that particleboard waste flour, such as wood-waste flour, is potentially suitable as a raw material in WPCs.