长玻纤增强PET复合材料的力学性能研究

采用自制的浸润装置，以PET浸渍长波纤，经切粒后得到长度为6mm的长纤维增强PET预浸料切片，经一定温度热处理，可得到长纤增强PET复合材料。研究了注塑样条中玻纤含量对其力学性能及玻纤长度分布的影响，并采用SEM观察了长玻纤增强PET注塑样条的断面形貌。结果表明，复合材料力学性能随玻璃纤维含量的提高均有不同程度的提高，当玻纤的质量分数在40％～50％时，力学性能基本达到最佳，且由本方法制备的长玻纤增强PET复合材料的力学性能已达到并超过了国外同类产品的水平。     

长玻纤增强聚丙烯复合材料性能研究

采用熔体浸渍包覆长玻璃纤维装置制备了长玻纤增强聚丙烯(PP/LFT)复合材料,通过双螺杆挤出机制备了同等配比的短玻纤增强聚丙烯(PP/SFT)复合材料。研究了增容剂含量、预浸料颗粒长度以及加工工艺对玻纤增强聚丙烯(PP/GF)复合材料力学性能的影响。结果表明:PP/LFT复合材料的力学性能明显优于PP/SFT复合材料,其拉伸强度及缺口冲击强度分别可达115.0 MPa和42.4 kJ/m~2;增容剂马来酸酐接枝聚丙烯(PP-g-MAH)的加入明显改善了GF与PP间的界面黏结强度,进一步提升了复合材料的力学性能,相比之下,增容剂对PP/SFT复合材料的性能提升效果更为明显;提高预浸料颗粒长度有利于复合材料纤维保留长度和力学性能的提升;适度提高加工温度,可进一步提高浸渍效果和复合材料的力学性能。     

连续玻纤增强PVC预浸料的制备成型工艺

以聚氯乙烯(PVC)树脂为基相,连续玻纤为增强相,利用湿法粉末浸渍法制备了连续玻璃纤维增强PVC预浸料,研究了牵拉速度、悬浮液浓度和树脂槽压辊包覆角对预浸料纤维含量的影响。结果表明:增加牵拉速度、降低悬浮液浓度和包覆角可以提高预浸料中纤维质量分数,但是当悬浮液浓度大于15%,包覆角大于300°时,纤维含量基本保持不变。将制得的预浸料经热压和冷压后制备了连续玻纤增强PVC复合板材,研究了纤维含量和丙烯酸酯聚合物(ACR)流动改性剂对复合材料力学性能的影响,结果表明:材料拉伸强度和弯曲强度随着纤维含量增加而呈先升后降趋势,在65%时达到最优性能,分别为302MPa和261MPa,加入ACR流动改性剂后材料拉伸强度提升15%左右,弯曲强度提升19%左右。     

注塑工艺对长玻纤增强聚丙烯材料性能及外观的影响研究

通过熔融挤出浸渍方法,制备了30%纤维含量的长玻纤增强聚丙烯材料(PP-LGF30),研究了在不同注塑工艺条件下,PP-LGF30复合材料的力学性能变化规律,纤维保留长度,以及制品外观状态。结果表明,提高注塑温度,增大射咀口径,降低储料与射胶过程的速度与压力,可使PP-LGF30复合材料的拉伸强度与缺口冲击强度提高;增大射咀口径可提高纤维在制品中的保留长度;提高注塑温度,增大射胶速度与压力,可降低纤维外漏程度,改善制品的外观状态。     

具有电磁屏蔽功能聚苯硫醚复合材料的制备与性能研究

本文采用粉末浸渍工艺制得连续玄武岩纤维和不锈钢纤维增强聚苯硫醚预浸料,预浸料的编织物经层压成型制备了聚苯硫醚复合材料,对复合材料的力学和电磁屏蔽性能进行了研究。结果表明:不锈钢纤维/聚苯硫醚预浸料与玄武岩纤维/聚苯硫醚预浸料层压所形成的复合材料其力学性能和电磁屏蔽性能均优于铝箔与玄武岩纤维/聚苯硫醚预浸料层压所形成的复合材料;当电磁波频率小于200 MHz时,复合材料的电磁屏蔽效能较高,不锈钢纤维/聚苯硫醚预浸料中不锈钢纤维质量分数(含量)为30%时,复合材料的电磁屏蔽效果达到较高值,当电磁波频率在200～1 500 MHz范围内,材料的屏蔽效能在20～30dB间波动。     

值得关注的预浸料市场

预浸料是用控制量的树脂(热固性或热塑性)浸渍纤维或织物后形成的中间材料。浸渍技术有溶剂浸渍、热熔体浸渍、粉末浸渍等。预浸料可以"B阶"状态或部分固化后储存。预浸带或预浸布用于手糊、自动铺带、自动铺纤或某些缠绕成型工艺中。单向预浸带(所有纤维平行)是最常见的预浸料形式,它们提供单向增强。机织布及其他平面织物预浸料提供二维增强,它们一般成卷销售。还有用纤维预成型体和编织物制成的预浸料,它们提供三维增强。     

注塑温度对长玻纤增强聚丙烯复合材料性能的影响

采用熔体浸渍工艺制备长玻纤增强聚丙烯材料,研究注塑温度对长玻璃纤维增强聚丙烯复合材料力学性能的影响.结果表明:注塑温度影响长玻璃纤维增强聚丙烯复合材料的力学性能;当注塑温度为290℃时,长玻璃纤维增强聚丙烯复合材料的力学性能最优.     

连续纤维增强热塑性预浸料制备工艺的研究进展

连续纤维增强热塑性复合材料综合性能优异,其应用与日俱增。作为热塑性复合材料制造用中间材料,连续纤维增强热塑性预浸料的制备和质量控制技术对于热塑性复合材料的发展来说至关重要。本文详细介绍了熔融浸渍法、溶剂浸渍法和粉末浸渍法三种工艺制备连续纤维增强热塑性预浸料的研究进展,总结了各种制备工艺的优缺点,并对高性能热塑性预浸料的发展趋势进行了展望。     

连续玻璃纤维增强聚丙烯预浸料粉末法浸渍过程及界面控制

本文研究了连续玻璃纤维增强聚丙烯复合材料的粉末浸渍过程,考察了聚合物粉末的粒径、浸渍槽内分散辊的数目及排布、聚合物在加热烘道中所能达到的温度、预浸料的牵引速率、接枝极性基团的改性聚丙烯的引入等对体系浸渍效果的影响,探索了控制 浸料中的树脂含量、孔隙率及调节复合体系界面结合的方法。     

连续碳纤维增强聚醚醚酮板材的研究

采用自行设计、组装的连续纤维增强热塑性树脂基复合材料粉末浸渍试验装置制备了连续碳纤维(CF)增强聚醚醚酮(PEEK)预浸带,再将浸渍带通过热压模塑成型制备出层合板材。通过万能材料试验机、悬臂梁冲击试验机研究了纤维含量和浸渍带铺放方式对板材力学性能的影响。结果表明,在一定范围内CF/PEEK板材弯曲、冲击强度随着纤维含量的增大而提高,拉伸强度达1 124. 89 MPa,约是PEEK纯料的11倍,浸渍带以0°铺放压制的纤维含量为60%的板材力学性能相对最优。扫描电子显微镜(SEM)结果表明,纤维被树脂基体紧密包覆,纤维分散均匀、排列紧密、界面黏结性较好。     

注塑条件对长玻纤增强聚丙烯性能影响研究

利用熔融浸渍装置,采用长玻纤(LGF)增强双马来酰亚胺等改性的聚丙烯(PP),制备了LGF增强PP复合材料。研究了在螺杆转速为80～250 r/min、背压为8～10 MPa的注塑条件下,复合材料的纤维长度、力学性能与热变形温度的变化。在研究范围内,注塑工艺参数的变化对复合材料的弯曲强度和热变形温度没有明显的影响,但随着螺杆转速的提高,纤维长度下降,所得复合材料的冲击强度先降低后升高。     

添加PA66－MPP提高PP／GF增强塑料力学性能的研究

本文研究ＰＰ／ＧＦ（玻纤增强聚丙烯）的加工过程中，添加ＰＡ６６（尼龙）、ＭＰＰ（ＰＰ－ｇ－ＭＡＨ）进一步促进ＧＦ对ＰＰ的增强作用。考察了ＭＰＰ对ＰＰ／ＰＡ６６共混物的增容作用，ＰＡ６６、ＭＰＰ的组成配比对ＰＰ／ＧＦ增强塑料力学性能和微观结构的影响。结果表明：ＰＡ６６、ＭＰＰ的组成比对ＰＰ／ＧＦ的力学性能影响较大；较佳配比的ＰＡ６６、ＭＰＰ，可大幅度地提高增强塑料的力学性能。     

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。     

Mechanical properties of injection molded long fiber polypropylene composites,Part 1: Tensile and flexural properties

Innovative polymers and composites are broadening the range of applications and commercial production of thermoplastics. Long fiber‐reinforced thermoplastics have received much attention due to their processability by conventional technologies. This study describes the development of long fiber reinforced polypropylene (LFPP) composites and the effect of fiber length and compatibilizer content on their mechanical properties. LFPP pellets of different sizes were prepared by extrusion process using a specially designed radial impregnation die and these pellets were injection molded to develop LFPP composites. Maleic‐anhydride grafted polypropylene (MA‐g‐PP) was chosen as a compatibilizer and its content was optimized by determining the interfacial properties through fiber pullout test. Critical fiber length was calculated using interfacial shear strength. Fiber length distributions were analyzed using profile projector and image analyzer software system. Fiber aspect ratio of more than 100 was achieved after injection molding. The results of the tensile and flexural properties of injection molded long glass fiber reinforced polypropylene with a glass fiber volume fraction of 0.18 are presented. It was found that the differences in pellet sizes improve the mechanical properties by 3–8%. Efforts are made to theoretically predict the tensile strength and modulus using the Kelly‐Tyson and Halpin‐Tsai model, respectively. POLYM. COMPOS., 28:259–266, 2007. © 2007 Society of Plastic Engineers     

Effects of preferential encapsulation of glass fiber on the properties of ternary GF/PA/PP blends

Long fiber molding materials are expected to play an important role in the near future. This paper describes a series of experiments performed to examine properties of ternary blends containing glass fiber (GF), polyamide (PA), and polypropylene (PP). The continuous glass fiber was impregnated with one of the blend constituent polymers by our specially designed impregnation apparatus and cut into chips of 6 mm length. These chips and the other polymer were used to produce various testing specimens in a twin screw extruder or in injection molding machine. The results indicated that the effect of fiber addition on the mechanical and rheological properties is clearly dependent on the order of impregnation process. In the blends containing the GF/PA + PP, the GFs are preferentially encapsulated with PA, and therefore the mechanical properties are superior to the blends with the GF/PP + PA in which the PP phase is located surrounding the GFs. This improved wetting of fibers by sequential impregnation not only resulted in better properties but also protected the fibers from shear action of the screw, thereby allowing significant increase in average fiber length to be achieved in the injection molding process.     

长玻纤增强聚丙烯复合材料力学性能的研究进展

综述了长玻纤增强聚丙烯复合材料(LGFPP)力学性能的研究进展,包括玻纤含量、玻纤和聚丙烯树脂基体间的界面结合状态以及加工工艺等因素对LGFPP力学性能的影响,并对LGFPP的研究趋势进行了展望。     

PP-g-MAH预浸渍玻璃纤维毡对GMT界面改性的作用

采用含有马来酸酐接枝聚丙烯(PP–g–MAH,简称MPP)的聚丙烯(PP)树脂对玻璃纤维(GF)毡预浸渍,进行增强体改性,通过直接浸渍工艺、增强体预浸渍工艺、累加浸渍工艺等不同工艺制备GF毡增强PP热塑性复合材料(GMT)。对不同工艺制备的GMT界面形态进行了扫描电子显微镜分析,并测定了预浸渍处理后GF的疏水性,研究了预浸渍工艺中MPP的用量对GMT拉伸、弯曲、冲击等力学性能的影响。结果表明:采用含MPP的PP树脂进行增强体预浸渍改性的方法,改性树脂对GF的包覆效果良好,经预浸渍改性法处理的GF,其疏水性增强;并可以获得与PP/MPP改性树脂直接浸渍GF毡时相似的界面改性效果和相近的GMT力学性能;样品界面改性效果相近的情况下,增强体预浸渍改性方法所需的MPP用量明显少于改性树脂直接浸渍时的用量。     

注塑工艺参数对长玻纤增强PA66复合材料力学性能的影响

研究了注塑工艺参数对长玻纤增强PA66(LGF-PA66)复合材料力学性能和玻纤残余长度的影响。运用非连续纤维增强复合材料的拉伸强度和冲击强度模型来解释实验结果,并建立了工艺参数与LGF-PA66力学性能的关系曲线。结果表明:注塑工艺参数决定了玻纤的残余长度和取向,进而影响了LGF-PA66复合材料的力学性能。     

玻璃纤维薄壁圆管复合结构的制备工艺及其性能研究进展

玻璃纤维薄壁圆管属于玻璃纤维增强塑料的一种,是指由玻璃纤维增强材料嵌入已固化的热固性树脂中或被其包裹形成复合结构的材料。针对玻璃纤维薄壁圆管复合结构从制备工艺到力学性能表征方面进行概述,制备工艺主要包括模压成型、纤维缠绕工艺等,力学性能方面包含失效形式、压缩性能和弯曲性能等,并对其未来研究方向进行了展望。     

Performance of long glass fiber‐reinforced polypropylene composites at different injection temperature

Long glass fiber‐reinforced polypropylene composites were prepared using self‐designed impregnation device. Effects of the different injection temperature on mechanical properties, crystallization, thermal, and dynamic mechanical properties of long glass fiber‐reinforced polypropylene composites were discussed. The differential scanning calorimetry (DSC) results indicate that the melting peak temperature of PP/LGF composites gradually reduced, however, the crystallinity of PP/LGF composites gradually increased with increasing injection temperature. Thermo‐gravimetric analyzer (TGA) results demonstrate that with increasing injection temperature, the temperature of the PP/LGF composites melt increased, the viscosity of the PP/LGF composites melt lowered, the mold filling of the PP/LGF composites melt was easy, the shear force of glass fiber was relatively low, which made the residual length of glass fiber in products increase. Dynamic thermal mechanical analyzer (DMA) results show that the storage modulus of PP/LGF composites is the highest while the injection temperature is at 290°C, and the peak value of tan σ of PP /LGF composites at 290°C is minimal, which indicates that the mechanical properties of PP /LGF composites at 290°C is the best. What' more, the injection temperature at 290°C significantly ameliorated “glass fiber rich skin” of products of glass fiber‐reinforced composites. J. VINYL ADDIT. TECHNOL., 24:233–238, 2018. © 2016 Society of Plastics Engineers