连续式蒸汽爆破对PBS/棉秆皮纤维复合材料拉伸性能的影响

采用连续式蒸汽爆破装置对含水量分别为20%、30%、40%及50%的棉秆皮纤维进行预处理,并制备预处理后棉秆皮纤维填充量分别为20%、30%、40%及50%的聚丁二酸丁二醇酯(PBS)/棉秆皮纤维复合材料标准拉伸样条。从外观形态、扫描电镜观察方面分析棉秆皮纤维含水量对其蒸汽爆破改性效果的影响;通过扫描电镜观察分析复合材料拉伸断面形貌,从拉伸强度、拉伸模量及断裂伸长率三方面研究了连续式蒸汽爆破对PBS/棉秆皮纤维复合材料拉伸性能的影响。结果表明,连续式蒸汽爆破预处理方法能有效改善棉秆皮纤维与PBS基体的界面黏结;爆破前纤维含水量及爆破后纤维填充量对PBS/棉秆皮纤维复合材料拉伸性能起决定性作用;综合考虑,当爆破前纤维含水量为40%、爆破后纤维填充量为40%时,PBS/棉秆皮纤维复合材料拉伸性能最佳。     

蒸汽爆破预处理对LDPE／棉皮纤维复合材料力学性能的影响

采用蒸汽爆破预处理过的棉皮作为增强纤维,通过模压成型制备LDPE/棉皮纤维复合材料,研究了爆破压力、棉皮纤维质量分数对LDPE/棉皮纤维复合材料力学性能的影响.实验结果表明,该复合材料的力学性能得到了改善,当压力为1.8 MPa、棉皮纤维质量分数为35%时,所获得的拉伸强度和弯曲强度为最佳.     

蒸气爆破预处理棉皮纤维对复合材料力学性能的影响

采用自行设计的蒸气爆破装置对棉秆皮进行预处理并对处理后纤维的外观形态等方面进行了研究;使用正交试验设计来研究蒸气爆破预处理的爆破压力、含水率、保压时间等参数以及纤维的含量对线型低密度聚乙烯(LDPE)棉/皮纤维复合材料力学性能的影响程度和显著性。结果表明:植物纤维的含量对复合材料的拉伸强度和弯曲强度性能影响呈高度显著,爆破压力对复合材料的拉伸强度和弯曲强度性能影响呈显著,含水率对拉伸强度有影响,但对弯曲强度影响不显著,而保压时间对两个试验指标的影响都不显著。     

熔融浸渍法制备PE-HD/黄麻纤维复合材料工艺及性能研究

采用特殊设计的天然纤维熔融浸渍模具制备黄麻长纤维颗粒,通过注塑工艺,制备了长黄麻纤维增强高密度聚乙烯（PE-HD）复合材料。研究了纤维含量、浸渍模具温度对PE-HD/黄麻纤维复合材料力学性能、微观断面形貌的影响。结果表明,利用熔融浸渍工艺制备PE-HD/黄麻纤维复合材料,有效地保障了黄麻纤维的长度,可显著提高复合材料的力学性能;当黄麻纤维含量为45 %,浸渍模具温度为210 ℃时,PE-HD/黄麻纤维复合材料的拉伸强度和弯曲强度最优,相对纯PE-HD分别提高了49.1 %和137 %。     

棉秆塑木复合材料的制备及性能研究

以棉秆粉和回收聚乙烯为原料、钛酸酯为偶联剂,采用热压法制备了棉秆塑木复合材料,利用正交试验法探讨了棉秆粉含量、热压温度和保温时间对塑木复合材料性能的影响,并通过物理力学性能测试单独考察了棉秆粉含量对塑木复合材料性能的影响。正交试验法的结果表明:棉秆粉含量对复合材料的弯曲强度、弹性模量和吸水率影响最大,热压温度和保温时间对复合材料的弯曲强度和弹性模量影响较大,对吸水率影响不大;当棉秆粉含量为40%、热压温度为160℃、保温时间为10 min时,塑木复合材料具有最优的综合性能。物理力学性能测试结果表明:复合材料的弯曲强度和弹性模量随棉秆粉含量的增加均呈现先增大后减小的趋势,在棉秆粉含量为40%时均达到最大值;吸水率随棉秆粉含量的增加而增大。     

棉皮纤维增强LDPE复合材料的拉伸性能

采用蒸汽爆破装王对棉皮进行预处理,在高温高压水蒸汽的条件下改变棉皮内部结构,并制备LDPE/棉皮纤维复合材料标准拉伸样条.从外观形态、扫描电镜方面对蒸汽爆破改性后棉皮纤维进行分析,并研究了蒸汽爆破压力对LDPE/棉皮纤维复合材料拉伸性能的影响,结果表明:蒸汽爆破预处理方法能有效解决界面粘结问题,提高LDPE/棉皮纤维复合材料的拉伸性能,当压力为1.6 MPa时,所获得的拉伸强度最佳.     

废纸/麦秸秆增强PE-HD复合材料性能对比研究

以废纸(WP)、麦秸秆(WF)和高密度聚乙烯(PE-HD)为原料,采用注射成型法制备了PE-HD/WP与PE-HD/WF复合材料,研究了WP与WF纤维含量以及硅烷偶联剂(KH570)含量对复合材料性能的影响,并对力学、吸水及界面性能进行了对比分析。结果表明,复合材料的力学性能均随WP与WF的加入呈先增加后降低的趋势,WP和WF的最佳含量分别为20%(质量分数,下同)和30%;KH570的加入改善了复合材料的界面相容性,提高了力学性能,降低了吸水性能,PE-HD/WP与PE-HD/WF复合材料的KH570最佳含量分别为1%和2%;WP与WF的长径比分别为24.2与12.5;当纤维含量为20%时,PE-HD/WP复合材料的力学性能、吸水性能及界面相容性均优于PE-HD/WF复合材料。     

PLA/蔗渣复合材料的制备及其性能的研究

以蒸汽爆破后的甘蔗渣纤维(BF)和聚乳酸(PLA)为原料,采用模压的方法制备了PLA/BF复合材料,研究了温度以及蒸汽爆破预处理对复合材料力学性能的影响,并通过红外光谱和电子扫描电镜分析了其作用机理。结果表明,随着温度的升高,纤维的分散性变好,BF与PLA得界面黏结性能变好,复合材料的力学性能提高,温度为230℃时复合材料的力学性能最佳;而蒸汽爆破预处理可提高纤维素的含量,增大纤维的比表面积,使复合材料的力学性能得到改善。     

乙酸酐处理棉秆皮纤维增强聚丙烯复合材料的制备及性能研究

以棉秆皮纤维为增强相、聚丙烯为基体相,制备4 mm厚、棉杆皮纤维含量为 30 %（质量分数,下同）的聚丙烯/棉秆皮纤维复合材料薄片,棉秆皮纤维先经NaOH预处理,再经过乙酸酐（浴比30∶1、浸泡30 min、温度30 ℃）改性处理后,复合材料的拉伸断裂强度和弯曲断裂强度都达到最高,相比未改性的分别增大了6.33 %和11.72 %。     

棉皮纤维增强聚丁二酸丁二醇酯复合材料的热性能及力学性能研究

采用连续式蒸汽爆破法对棉皮纤维进行预处理,将其与聚丁二酸丁二醇酯(PBS)进行共混,制备了PBS/棉皮纤维复合材料。利用扫描电镜对棉皮纤维及PBS/棉皮纤维复合材料的微观形貌进行了分析,并研究了棉皮纤维含量对PBS/棉皮纤维复合材料熔融及结晶行为、热降解性能、热变形温度以及力学性能的影响。结果表明:经蒸汽爆破处理后,棉皮纤维直径变小,比表面积变大,在PBS基体中分散均匀;棉皮纤维的存在改变了PBS的熔融峰值温度,提高了其结晶度;与纯PBS相比,PBS/棉皮纤维复合材料在高温条件下的热稳定性得到改善维,卡软化温度和弯曲强度提高。     

锦葵纤维增强聚丙烯基复合材料力学性能研究

分别制备了锦葵纤维含量为10 %（质量分数,下同）、20 %、30 %、40 %和50 %的锦葵纤维增强增强聚丙烯基复合材料,研究了纤维含量对该复合材料拉伸性能和弯曲性能的影响,并与苎麻纤维增强聚丙烯基复合材料进行了对比。结果表明,随着锦葵纤维含量的增加,锦葵纤维增强聚丙烯基复合材料的拉伸强度和拉伸弹性模量逐渐增加,而弯曲强度和弯曲弹性模量呈现先增大后减小的趋势,当纤维含量为40 %时达最大值;纤维含量均为30 %时,除拉伸弹性模量外,锦葵纤维增强聚丙烯基复合材料的各项指标均低于苎麻纤维增强聚丙烯基复合材料。     

Mechanical,Water Absorption and Dimensional Stability Studies of Kenaf Bast Fibre-Filled Poly(butylene succinate) Composites

The effects of fibre loadings (10?40 wt.%) on mechanical properties, water absorption and dimensional stability of poly(butylene succinate)-filled kenaf bast fibre composites were investigated. The flexural strength and modulus of the composites increased with increasing fibre loading, while the impact strength of the composites decreased with increasing fibre loading. The higher the KBF loading was the higher absorption rate, equilibrium moisture content and the poorer dimensional stability of the composites. The poor retention and recovery of the composites from effect of water absorption were reflected by the poor flexural properties of the wet and re-dried composites after exposed to 90 days' water immersion.     

连续式蒸汽爆破对PP/棉杆纤维复合材料力学性能的影响

以连续式蒸汽爆破预处理的棉杆作为增强纤维,通过模压成型制得聚丙烯(PP)/棉杆纤维复合材料.研究了蒸汽爆破条件中纤维含水量及爆破次数对复合材料力学性能的影响.结果表明,该预处理使复合材料力学性得以改善.当纤维含水量为40%、爆破次数两次时,获得的复合材料综合力学性能最佳.     

Mechanical performance and moisture absorption of various natural fiber reinforced thermoplastic composites

Natural fibers are seeing increased use in composite applications due to their reduced cost, low density, and environmental benefits (more sustainable and lower carbon footprint). Although many natural fiber systems have been examined over the last decade, there have been relatively few studies which have compared a variety of fiber types and processing methods directly in the same experimental set. In this study, natural fiber composites made from low density polyethylene (LDPE) and a variety of Canadian based fiber feedstocks were examined including hemp bast, flax bast, chemically pulped wood, wood chips, wheat straw, and mechanically pulped triticale. The effect of fiber type, fiber fraction and maleic anhydride polyethylene (MAPE) coupling agent on the mechanical properties and long‐term moisture absorption behavior was quantified. In general, addition of natural fiber to LDPE results in an increase in modulus (stiffness) with a corresponding loss of material elongation and impact toughness. Of the fiber types tested, composites made from chemically pulped wood had the best mechanical properties and the least moisture absorption. However, the use of MAPE coupling agent was found to significantly increase the mechanical performance and reduce moisture absorption for all other natural fiber types. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 969‐980, 2013     

Sago starch‐filled linear low‐density polyethylene (LLDPE) films: Their mechanical properties and water absorption

Composites containing various percentages of sago starch and linear low‐density polyethylene (LLDPE) have been prepared. The mechanical properties and water uptake of the composites have been determined. The tensile strength and elongation at break decreased with increase in starch content. However, the modulus of the composites increased with increase in starch content. The yield strength was not significantly affected. Moisture uptake in humid air and in water increased with increase in starch content. At higher relative humidity the composites absorbed more moisture, thus indicating that the moisture barrier properties decreased with increase in relative humidity. Moisture uptake was highest when the composites were completely immersed in water. Scanning electron microscopy (SEM) shows agglomeration of the starch granules and hence, poor wetting between the starch granules and LLDPE matrix. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 29–37, 2001     

Effect of bis(3‐triethoxysilylpropyl) tetrasulfide on the crosslink structure,interfacial adhesion,and mechanical properties of natural rubber/cotton fiber composites

Bis(3‐triethoxysilylpropyl) tetrasulfide (TESPT) was used to improve the interfacial adhesion between cotton fiber and natural rubber (NR). The crosslink density, interfacial adhesion, mechanical properties, dynamic mechanical properties, and morphology of NR/cotton fiber composites were investigated. The composites with TESPT had higher crosslink density, better mechanical properties, higher initial modulus, and higher yield strength than the composites without TESPT because of the difference in interfacial adhesion. The results of an interfacial adhesion evaluation, the high storage modulus and low damping values of the composites with TESPT, and the coarse surfaces of the pullout fibers implied the enhancement of interfacial adhesion. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

An investigation for the effect of recycled matrix on the properties of textile waste cotton fiber reinforced (T‐FRP) composites

The main objective of this research is to study the effect of recycled low density polyethylene (r‐LDPE) matrix on the tensile, impact, and flexural properties of the novel textile waste cotton fiber reinforced (T‐FRP) composites. For this purpose, the T‐FRP composites were manufactured by using two different matrix types; namely, virgin LPDE (v‐LDPE) and r‐LDPE, with different waste cotton fiber content. All composites were compatibilized by maleic anhydride‐LDPE (MA‐LDPE) in order to increase the interfacial adhesion between fibers and matrices. Differential scanning calorimetry, Fourier transform infrared spectroscopy, scanning electron microscopy, dynamic mechanical analyzer studies were performed in order to characterize the materials. The results have shown that best tensile and flexural properties have been obtained from the composites with the content of 30 wt% cotton fiber, 5 wt% maleic anhydride‐LDPE, and 65 wt% recycled LDPE matrix. However, the impact properties of the composites were decreased drastically compared to the pure LDPE matrix. POLYM. COMPOS., 38:1231–1240, 2017. © 2015 Society of Plastics Engineers     

聚甲醛/低密度聚乙烯接枝纳米二氧化硅复合材料的研究

通过熔融接枝及熔融共混法制备了聚甲醛/低密度聚乙烯接枝纳米二氧化硅(POM/PE-LD-g-SiO2)复合材料,并对复合材料的力学、热和摩擦磨损性能进行研究。结果表明,PE-LD-g-SiO2的加入对POM基体具有良好的增强增韧作用,且随着PE-LD-g-SiO2含量的增加复合材料的力学和热性能均呈现先增大后降低的趋势。当PE-LD-g-SiO2的质量分数为4%时,复合材料的力学和热性能均达到最大值;而摩擦系数和体积磨损量逐渐降低,当PE-LD-g-SiO2的质量分数为6%时,达到最小值。     

Effect of Sodium Bicarbonate on the Mechanical and Degradation Properties of Short Jute Fiber Reinforced Polypropylene Composite by Extrusion Technique

Short jute fibers and the pellets of polypropylene (PP) were compounded to make composites with the help of an extruder followed by compression molding. The mechanical properties of the composites increased with the increase of fiber content up to 20%, then decreased while the jute content varied from 5 to 30 wt%. Composites with varying percentages (5 to 20%) of sodium bi-carbonate at constant (20%) jute content were made by same process. The mechanical properties, soil degradation tests, and the water uptake capacity of the composites were investigated properly. Also, the density of the composite was reduced up to 21.54%.     

轻质环氧复合材料的制备与性能研究

制备了一种以空心玻璃微珠为填充材料的轻质环氧复合材料,确定了材料的固化工艺,并对不同型号的空心玻璃微珠进行了筛选.研究了玻璃微珠填充量对材料密度及力学性能的影响.研究发现,复合材料的密度随空心玻璃微珠填充量的加大呈现先降低后略有升高的趋势;拉伸强度和压缩强度均随填充量的增加而减小;拉伸弹性模量和压缩弹性模量随着填充量提...