长玻纤增强ABS复合材料的动态力学性能

采用熔体浸渍工艺制备了高性能丙烯腈-丁二烯-苯乙烯共聚物(ABS)复合材料,利用动态热机械分析仪(DMA)对长玻纤增强ABS复合材料进行动态力学性能测试和表征,结果表明:玻纤含量和扫描频率对长玻纤增强ABS复合材料的动态力学性能有一定程度的影响,长玻纤增强复合材料的储能模量随着玻纤含量的增加而逐渐增加,复合材料的损耗因子随着扫描频率的增加而降低,同时采用Arrhenius方程计算长玻纤增强ABS复合材料在α转变时的分子运动活化能。另外,还研究了玻纤含量对长玻纤增强ABS复合材料力学性能的影响。     

DCP对长玻纤增强聚丙烯复合材料性能的影响

长玻纤增强聚丙烯复合材料采用熔体浸渍工艺制备,研究过氧化二异丙苯(DCP)对长玻纤增强聚丙烯复合材料性能的影响。结果表明:随着DCP用量的增加,长玻纤增强聚丙烯复合材料的拉伸强度、弯曲强度、缺口冲击强度、弯曲模量均先增加后降低,通过动态力学性能和形态分析得出,当DCP添加量为0.4%时,长玻纤增强聚丙烯复合材料的拉伸强度、弯曲强度、弯曲模量和缺口冲击强度均最高。     

树脂基体对玻纤单向复合材料力学性能的影响

采用玻璃纤维增强聚氨酯(PU)树脂与环氧树脂(EP)分别制备了两种单向复合材料,通过动态接触角与纤维拔出法表征了玻纤与树脂的润湿性和界面强度,并研究了单向复合材料静态与动态力学性能。结果表明,与环氧树脂相比,聚氨酯树脂黏度低和表面张力小,与玻纤之间具有更低的动态接触角和更高的界面强度,使得PU/玻纤复合材料具有更优异的静态力学性能;但在动态测试下,与EP/玻纤复合材料相比,PU/玻纤复合材料具有较低的储能模量、较高的损耗模量和玻璃化转变温度。     

长玻纤增强ABS复合材料的制备与性能

采用熔体浸渍工艺制备了长玻纤增强丙烯腈-丁二烯-苯乙烯共聚物(ABS)复合材料,研究了不同长玻纤含量对长玻纤增强ABS复合材料力学性能、动态力学性能和形态的影响。结果表明:随着长玻纤含量的增加,长玻纤增强ABS复合材料的力学性能和动态力学性能逐渐增加;长玻纤在基体树脂中具有良好的分散性。     

一种高模量玻璃纤维增强聚丙烯材料的制备与研究

通过对玻纤增强聚丙烯模量影响因素分析,研究了玻纤质量分数、基体树脂选型及纤维直径与保留长度对其复合材料模量的影响.结果 表明:玻纤质量分数对模量影响最为直接,基体树脂流动性越好,模量越高;纤维保留长度越长,复合材料模量越高;在一定范围内,不同纤维直径对复合材料模量影响不明显.     

汽车聚丙烯风道支架材料弯曲性能研究

以汽车风道支架常用的20%(质量分数,下同)滑石粉填充聚丙烯(PP)材料、20%短玻纤增强PP材料、5%长玻纤增强PP材料和20%长玻纤增强PP材料为研究对象,通过扫描电子显微镜对材料中滑石粉和玻纤的取向性进行了观察,并对其注塑样板中流动方向和垂直流动方向的弯曲模量进行测试。结果表明：滑石粉、玻纤在PP基体中均具有明显的取向性,且玻纤长度越短取向性越强。玻纤增强PP材料流动方向的弯曲模量保留率明显高于滑石粉填充PP材料,且玻纤长度越长、含量越高,其弯曲模量保留率越高;玻纤长度越短,材料垂直流动方向的弯曲模量越低。滑石粉填充PP材料流动与垂直流动方向的弯曲模量差异性较小,玻纤增强PP材料长径比越大、含量越少,材料流动与垂直流动方向的弯曲模量差异越小。     

长玻纤增强聚甲醛复合材料的制备与性能

采用熔体浸渍工艺制备了长玻纤增强聚甲醛共聚物复合材料,研究了不同玻纤含量对长玻璃纤维增强聚甲醛复合材料力学、动态力学性能和形态的影响。结果表明:随着玻纤含量的增加,长玻璃纤维增强聚甲醛复合材料的力学和动态力学性能逐渐增加;SEM图片可以看出玻璃纤维在基体树脂中具有良好的分散性。     

长玻璃纤维增强尼龙66力学性能的研究

采用自行研制的熔体浸渍包覆长玻纤装置,制备了长玻纤增强尼龙66(LFT-PA66)复合材料.研究了玻纤用量、预浸料粒料长度和相容剂聚丙烯接枝马来酸酐(PP-G-MAH)对长纤维增强尼龙66的拉伸强度和冲击强度的影响.结果表明:长玻纤增强尼龙66的力学性能明显优于短玻纤增强尼龙66(SFT-PA66),相容剂PP-G-MAH的加入增强了界面黏结强度,提高了长玻纤增强尼龙66复合材料的拉伸强度和冲击强度.     

高强度聚甲醛复合材料的动态力学性能

采用熔体浸渍工艺制备了增强聚甲醛复合材料,利用动态热机械分析仪(DMA)对增强聚甲醛复合材料进行动态力学性能测试和表征,结果表明,增强聚甲醛复合材料中玻纤含量和扫描频率对增强聚甲醛复合材料的动态力学性能有一定程度的影响,随着玻纤含量的增加,增强聚甲醛复合材料的储能模量逐渐增加,随着扫描频率的增加,复合材料的损耗因子降低,同时采用Arrhenius方程计算增强聚甲醛复合材料在α转变时分子运动活化能。另外,还研究了玻纤含量对增强聚甲醛复合材料的力学性能的影响。     

玻纤增强尼龙材料强度的Weibull统计分析

对不同短玻纤含量的尼龙复合材料的拉伸强度和弯曲强度的Weibull分布的特征进行初步分析,指出不同玻纤含量的尼龙复合材料的拉伸强度具有相近的Weibull模量,而不同玻纤含量的尼龙复合材料弯曲强度的Weibull模量相差较大。     

长玻璃纤维增强热塑性塑料的开发应用

通过对玻璃纤维（GF）增强聚丙烯（PP）改性、长GF的表面浸润与分散性的研究,开发出与PP相容、充分适应长纤维增强热塑性塑料（LFT）加工要求的专用无捻粗纱,并通过长纤维造粒技术和注塑工艺制备性能优良的制品．其力学性能明显优于短GF增强PP。最后介绍了长GF增强热塑性塑料的应用前景。     

Fabrication of long glass fiber reinforced polyacetal composites: Mechanical performance,microstructures, and isothermal crystallization kinetics

A thermoplastic pultrusion was carried out to prepare the long fiber reinforced thermoplastic (LFT) composites based on polyacetal (POM) matrix on the custom‐designed pultrusion equipment. The investigation on mechanical performance revealed that the POM‐based LFT composites achieved much higher tensile, flexural, and impact strength than the short glass fiber reinforced ones at the same fiber loadings. Such a promising reinforcement effect is attributed to the feature that the residual fiber length in the injection‐molded LFT products is greatly superior to that in short fiber reinforced ones. This takes full advantage of the strength of the reinforcing fiber itself. The scanning electronic microscopy demonstrated that the fiber fracture and fiber pull‐out concurred on the tensile and impact fracture surfaces, and the former preceded the latter. The isothermal crystallization kinetics of the POM‐based LFT composites was also intensively studied, and the results indicated that the crystallinity of POM domain was enhanced by the heterogeneous nucleation of glass fiber, but the crystallization rate was postponed due to the interspace restriction toward crystalline growth caused by long glass fiber. These kinetic parameters provided information on the processing conditions of POM‐based LFT composites for the injection and compression molding. POLYM. COMPOS., 36:1826–1839, 2015. © 2014 Society of Plastics Engineers     

Mechanical and high velocity impact performance of a hybrid long carbon/glass fiber/polypropylene thermoplastic composite

This research explores mechanical and high velocity impact response of hybrid long carbon/glass fiber-reinforced polypropylene thermoplastic composites (HLFT) with different fiber lengths. The work examines three hybrid long fiber thermoplastic composites, i.e., 5, 10 and 20 mm. The HLFTs were prepared by a combination of extrusion and pultrusion processes and using a cross-head die. Tensile and Izod impact tests were carried out to evaluate the mechanical performance of each HLFT compound. A gas gun with a spherical projectile was used to conduct high velocity impact tests at three velocities of 144, 205 and 240 m/s. The results showed that internal mixing operation caused extensive reduction in fiber length of all three LFT lengths. Tensile strength, modulus and Izod impact test results were the indications of higher values with increase in HLFT length. Comparison of these results for the HLFT with that of corresponding glass/PP LFTs, adopted from earlier work by Shayan Asenjan et al. (J Compos Mater 53:353–360, 2019), showed better performance of HLFT. The high velocity impact results showed a steady higher impact performance with the increase in HFLT fiber length for all impact velocities tested. Comparison of HLFT high velocity impact performance revealed better results for all impact velocities tested with that of the corresponding glass/PP LFT composite.     

热氧老化对长玻璃纤维增强PP材料动态流变性能影响

通过熔融共混法制备长玻璃纤维增强聚丙烯(LGFPP)复合材料,采用旋转流变仪和扫描电子显微镜测试研究了不同热氧老化时间下复合材料的动态流变行为。结果表明,热氧老化过程PP发生降解,分子量降低,同时随老化程度的加深分子链的缠结以及分子间相互作用力逐渐被削弱,分子链松弛能力增加;树脂的降解过程容易在纤维与基体的界面区域进行,使得纤维与基体的界面性能下降,粘结力下降。因此,随老化时间的增加复合材料的储能模量、损耗模量、损耗因子以及复数黏度都呈现下降趋势。     

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。     

Long jute fiber‐reinforced polypropylene composite: Effects of jute fiber bundle and glass fiber hybridization

Two types of long jute fiber pellet consisting of twisted‐jute yarn (LFT‐JF/PP) and untwisted‐jute yarn (UT‐JF/PP) pellets are used to prepare jute fiber–reinforced polypropylene (JF/PP) composites. The mechanical properties of both long fiber composites are compared with that of re‐pelletized pellet (RP‐JF/PP) of LFT‐JF/PP pellet, which is re‐compounded by extrusion compounding. High stiffness and high impact strength of JF/PP composites are as a result of using long fiber. However, the longer fiber bundle consequently affects the distribution of jute fiber. The incorporation of 10 wt % glass fibers is found to improve mechanical properties of JF/PP composites. Increasing mechanical properties of hybrid composites is dependent on the type of JF/PP pellets, which directly affect the fiber length and fiber orientation of glass fiber within hybrid composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41819.     

长玻璃纤维增强聚丙烯复合材料的高性能、低成本化技术

本文通过直接挤出混炼的方法制备了长玻璃纤维增强聚丙烯复合材料,研究了长纤维增强聚丙烯复合材料高性能、低成本化的方法。通过与连续玻璃纤维增强聚丙烯织物的组合,获得了力学性能超过玻璃纤维毡增强聚丙烯复合材料的高性能复合材料。在树脂基体中掺混廉价的填料及回收的聚丙烯树脂,结合适当的填料表面处理方法及废弃回收树脂的增韧及抗老化改性,在力学性能保持一定水平的基础上,可有效降低材料的成本。     

长玻纤增强热塑性复合材料阻燃改性及老化性能研究进展

综述了近几年来长玻璃纤维(LGF)增强热塑性复合材料的发展现状,重点以聚丙烯为例,介绍了纤维含量、分布及纤维与基体之间相容性等因素对LGF增强热塑性复合材料性能的影响;重点以尼龙6为例,对LGF增强热塑性复合材料的阻燃改性及老化性能的相关研究进行了阐述。最后对未来LGF增强热塑性复合材料改性及抗老化研究的重点和方向进行了展望。     

单向芳纶/玻璃纤维混杂复合材料板材拉伸性能研究

本文对单向芳纶/玻璃纤维复合材料进行制作,对其纵向拉伸强度、拉伸模量和弹性伸长进行实验分析。实验结果表明,单向混杂复合材料的拉伸断裂大多为多次性,界面数越多,一次性断裂的可能性越大。界面数为1的混杂纤维复合材料的芳纶纤维体积含量在对拉伸强度影响上的存在临界值,表现出明显的混杂效应。界面数大于1的混杂复合材料在芳纶纤维铺层数一定的情况下,界面数的多少不影响混杂复合材料拉伸强度和拉伸弹性模量的大小。界面数大于1比界面数为1的复合材料的拉伸强度和拉伸模量明显偏高。同时对不同制作条件下纯玻璃纤维单向复合材料的拉伸性能进行剖析。     

Polymerization compounding composites of nylon‐6,6/short glass fiber

Nylon‐6,6 was grafted onto the surface of short glass fibers through the sequential reaction of adipoyl chloride and hexamethylenediamine onto the fiber surface. Grafted and unsized short glass fibers (USGF) were used to prepare composites with nylon‐6,6 via melt blending. The glass fibers were found to act as nucleating agents for the nylon‐6,6 matrix. Grafted glass fiber composites have higher crystallization temperatures than USGF composites, indicating that grafted nylon‐6,6 molecules further increase crystallization rate of composites. Grafted glass fiber composites were also found to have higher tensile strength, tensile modulus, dynamic storage modulus, and melt viscosity than USGF composites. Property enhancement is attributed to improved wetting and interactions between the nylon‐6,6 matrix and the modified surface of glass fibers, which is supported by scanning electron microscopy (SEM) analysis. The glass transition (tan δ) temperatures extracted from dynamic mechanical analysis (DMA) are found to be unchanged for USGF, while in the case of grafted glass fiber, tan δ increases with increasing glass fiber contents. Moreover, the peak values (i.e., intensity) of tan δ are slightly lower for grafted glass fiber composites than for USGF composites, further indicating improved interactions between the grafted glass fibers and nylon‐6,6 matrix. The Halpin‐Tsai and modified Kelly‐Tyson models were used to predict the tensile modulus and tensile strength, respectively.