注塑工艺制备玻璃纤维增强聚合物研究

采用碱性短玻璃纤维增强PP,通过混合-注塑工艺制备玻璃纤维/PP复合材料,并较全面的研究了玻纤含量、长度、偶联剂类型与加入量对复合材料力学性能的影响。结果表明:随着玻纤含量的增加,复合材料的力学性能有明显的提高,增加到35%时性能最佳;并且发现纤维长度越长,增强的幅度越大;随着注塑次数的增多,聚合物的拉伸强度先大后小,证实3次较好;说明用注塑法来制备短纤维增强PP复合材料是完全可行的。     

长纤混杂增强复合材料注塑成型的微观结构演化

采用熔体浸渍拉挤工艺(LFT-G)制备长碳纤/玻纤混杂增强聚丙烯(LCF/LGF/PP)复合材料。首先研究了纤维表面处理、微观形貌、界面结合状态对复合材料力学性能的影响,并研究了纤维不同混配比对复合材料力学性能的影响。结果表明,纤维经表面处理,增加了与基体的机械啮合作用,改善了界面结合形貌,提高了复合材料的力学性能。与单一纤维增强复合材料相比,混杂增强纤维更易形成随机取向的三维骨架结构。且碳纤和玻纤混合质量比为2∶1时,其注塑制品获得相对较高的强度、韧性和刚度,同时具有相对较低的成本。     

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.     

长玻纤增强聚丙烯复合材料力学性能的研究

通过熔体浸渍法制备了一定玻纤含量的长玻纤增强聚丙烯(PP/LGF)母粒,然后将一定配比的母粒与PP通过注射机注塑成样条,研究了LGF用量及相容剂、增韧剂的添加对PP/LGF复合材料力学性能的影响。结果表明:当LGF用量为35%左右时,PP/LGF复合材料的力学性能达到最佳,较之纯PP显著提升。相容剂的加入改善了PP/LGF复合材料的力学性能,并且提高了LGF和PP之间的黏结力。增韧剂的加入使得复合材料的拉伸强度、弯曲强度和弯曲模量呈现下降的趋势,冲击强度则随增韧剂用量的增加逐渐提升。     

长玻纤增强聚丙烯在汽车翼子板上的应用

对不同玻纤质量分数的LFT-PP粒料国标注塑样条,进行拉伸、弯曲、冲击等性能测试分析,结果表明:玻纤试样的拉伸强度、弯曲强度以及冲击强度均随玻纤质量分数的增加而提高;样品断裂延伸率随玻纤质量分数变化不明显,弯曲挠度随玻纤质量分数增加而减小;其中质量分数40％的玻纤试样拉伸强度达到145 MPa,弯曲强度高达170 MPa,简支梁缺口冲击强度为27 kJ/m2,表现出优异的力学性能.将质量分数40％玻纤的长纤粒料注塑成汽车翼子板制件,制品通过了汽车塑料制品各项测试并完成装配.     

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。     

玻纤增强尼龙6的挤出工艺及力学性能

采用长玻纤连续添加和短切玻纤制备了玻纤增强尼龙6(PA6)复合材料。主要考察了玻纤含量、玻纤种类以及挤出工艺条件对复合材料力学性能的影响,并利用扫描电子显微镜对复合材料的冲击断面和拉伸断面及玻纤形态进行了观察。结果表明,采用短切玻纤加入时,玻纤含量对GF/PA6复合材料的力学性能影响很大。随玻纤含量的增加,复合材料的力学性能越来越高,断裂伸长率变低。加工工艺参数对复合材料的力学性能有影响。采用长玻纤连续添加时,玻纤的添加位置对复合材料的性能影响不大。在玻纤含量相同时,采用长玻纤连续添加得到的材料力学性能明显优于采用短切玻纤时的性能。玻纤能均匀地分散在PA6基体中,玻纤的保留长度和长度分布对复合材料的性能有直接影响。     

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。     

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。     

GFRPP复合材料“浮纤”改善及结构与性能研究

以改善玻纤增强聚丙烯(GFRPP)复合材料注射成型"浮纤"现象为研究目标,加入不同用量的石蜡对GFRPP复合材料进行改性,考察了石蜡对GFRPP复合材料表面形貌、流动性能、力学性能和热力学性能的影响。结果表明,加入石蜡有利于改善GFRPP复合材料的"浮纤"现象,加入超过10份石蜡后,复合材料注塑制品表面基本没有玻纤外露现象。随着石蜡用量的增加,复合材料的流动性能显著提高,力学性能有所下降,结晶温度降低。     

长玻纤增强丙烯腈-苯乙烯复合材料的研制

采用熔体浸渍工艺制备了长玻纤增强丙烯腈-苯乙烯共聚物复合材料(LGF/AS),研究了不同玻纤含量对LGF/AS复合材料力学、动态力学性能和形态的影响。结果表明:随着玻璃纤维含量的提高,LGF/AS复合材料的力学和动态力学性能逐渐增加;通过SEM证明了玻璃纤维在基体树脂中的具有良好的分散性。     

Mechanical,thermal, and dynamic mechanical properties of long glass fiber‐reinforced thermoplastic polyurethane/polyoxymethylene composites

Long glass fiber (LGF)‐reinforced thermoplastic polyurethane (TPU) elastomers and polyoxymethylene (POM) (LGF/TPU/POM) composites were prepared by using self‐designed impregnation device. Dynamic mechanical properties of the LGF/TPU/POM composites have been investigated by using dynamic mechanical thermal analysis. The results indicated that the storage modulus and glass transition temperature of the composites increase with increasing the glass fibers content and scanning frequencies. In addition, the Arrhenius relationship has been used to calculate the activation energy of α‐transition of the LGF/TPU/POM composites. The thermal stability of the LGF/TPU/POM composites was investigated by thermogravimetric analysis. The consequence demonstrated that the thermal stability increase with augmenting the content of glass fibers. The mechanical properties of the composites are investigated by a universal testing machine and a ZBC‐4 Impact Pendulum. The results demonstrated the mechanical properties of the composites aggrandize with augmenting the glass fibers content. The good dispersion of the LGFs in the matrix resins is obtained from scanning electron micrographs. POLYM. COMPOS., 35:2067–2073, 2014. © 2014 Society of Plastics Engineers     

长玻璃纤维增强PA66复合材料的综合性能及其影响因素研究

利用定制的熔融浸渍装置制备了长玻璃纤维增强聚酰胺66(PA66/LGF)复合材料,并对其力学性能、界面黏结性等进行了表征,探讨了玻璃纤维含量、润滑剂含量、相容剂含量以及切粒长度等因素对复合材料性能的影响,得到了PA66/LGF复合材料优化的配方设计与切粒长度.结果表明,当玻璃纤维含量为43％(质量分数,下同)、切粒长度...     

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     

Study on long fiber–reinforced thermoplastic composites prepared by in situ solid‐state polycondensation

Long glass fiber–reinforced thermoplastic composites were prepared by a new process, in situ solid‐state polycondensation (INSITU SSP). In this process reinforcing continuous fibers were impregnated by the oligomer of PET melt, and then the impregnated continuous fibers were cut to a desired length (designated prepreg); finally, the prepreg was in situ polymerized in the solid state to form the high molecular weight matrix. SEM, FTIR spectra, short‐beam shear stress test, flexural strength test, impact strength test, and the intrinsic viscosity measurement were used to investigate the wetting and interfacial adhesion, the mechanical properties of the composite, and the molecular weight of matrix resin in the composite. The results showed that the molecular weight of PET in the matrix resin and mechanical properties could be adjusted by controlling the SSP time and that the high level of interfacial adhesion between reinforcing fibers and matrix resin could be achieved by this novel INSITU SSP process, which are attributed to the good wetting of reinforcing fibers with low molecular weight oligomer melt as the impregnation fluid, the in situ formation of chemical grafting of oligomer chains onto the reinforcing fiber surface, and the in situ formation of the high molecular weight PET chains in the interphase regions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91:3959–3965, 2004     

Effect of impregnation time on performance of long glass fiber‐reinforced polypropylene composites

Long glass fiber (LGF)‐reinforced polypropylene (PP) composites were prepared using self‐designed impregnation device. Effects of impregnation time on mechanical properties, crystallization, dynamic mechanical properties, and morphology of PP/LGF composites were investigated. The experiment results demonstrate that the excellent tensile strength, Notched Izod impact strength was 152.9 MPa, 31.2 KJ/m², respectively, and the stiffness of PP/LGF composites was higher, when the impregnation time was 7.03 s. The excellent interfacial adhesion between PP and glass fiber indicates that PP/LGF composites possess the outstanding mechanical properties. The impregnation time scarcely influenced thermal properties of PP/LGF composites. J. VINYL ADDIT. TECHNOL., 24:174–178, 2018. © 2016 Society of Plastics Engineers     

长玻璃纤维增强聚丙烯复合材料的力学性能研究

采用熔体浸渍技术制备了长玻璃纤维母料(LGF/PP-g-MAH/PP)增强聚丙烯(PP)复合材料(LGF/PP)。通过双螺杆挤出机制备了同等配比的短玻纤增强聚丙烯(SGF/PP)复合材料。研究了LGF含量、环氧树脂(EP)和固化剂(2E4MZ)对LGF/PP复合材料的力学性能影响。结果表明:当LGF质量分数为35%～40%时,LGF/PP的综合力学性能最好,且明显优于同样组成的SGF/PP复合材料。EP和含固化剂(2E4MZ)的EP对LGF/PP复合材料的力学性能提高有一定的作用。SEM照片分析表明:EP的加入能改善玻纤与聚丙烯基体的界面粘接。     

剑麻纤维/长玻纤混杂增强PP复合材料的力学性能研究

采用剑麻纤维(SF)和长玻璃纤维(LGF)混杂增强聚丙烯(PP)复合材料,考察了SF/LGF的比例和含量对PP复合材料力学性能的影响。结果表明:SF/LGF在聚丙烯树脂基体中呈交叉网状分布,这有利于提高复合材料的冲击强度、弯曲模量、拉伸强度和软化点。在SF/LGF质量比为2 2∶,二者总质量分数为30%时,SF/LGF混杂增强PP复合材料的综合力学性能较好。     

Preparation of thermoset composites from natural fibres and acrylate modified soybean oil resins

Structural composites with a high content of renewable material were produced from natural fibres and an acrylated epoxidized soybean oil resin. Composites were prepared by spray impregnation followed by compression moulding at elevated temperature. The resulting composites had good mechanical properties in terms of tensile strength and flexural strength. Tensile testing as well as dynamical mechanical thermal analysis showed that increasing the fibre content, increased the mechanical properties. The resin can be reinforced with up to 70 wt % fibre without sacrifice in processability. The tensile modulus ranged between 5.8 and 9.7 GPa depending on the type of fibre mat. The study of the adhesion by low vacuum scanning electron microscopy shows that the fibres are well impregnated in the matrix. The aging properties were finally evaluated. This study shows that composites with a very high content of renewable constituents can be produced from soy bean oil resins and natural fibres. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Preparation and Mechanical Properties of Long Glass Fiber Reinforced PA6 Composites Prepared by a Novel Process

Summary: Long glass fiber reinforced PA6 (LGF/PA6) prepregs were prepared by impregnating PA6 oligomer melt into reinforcing glass fiber followed by subsequent solid‐state polymerization (SSP) to obtain LGF/PA6 composite pellets. A conventional injection‐molding machine suitable for short glass fiber reinforced composites was applied to the processing of the prepared composites, which reduced the fiber length in the final products. Mechanical properties, thermal property, and fiber length distribution of injection molding bars were investigated. Scanning electron microscopy (SEM) was used to observe the impact fracture surfaces and the surfaces of glass fiber after the SSP. It was found that the LGF/PA6 composites were of favorable mechanical properties, especially the impact strength, although the average length of glass fiber was rather short. By this novel process, the content of glass fiber in composite could be high up to 60 wt.‐% and the maximum level of heat distortion temperature (HDT) was close to the melting temperature of PA6. SEM images indicated the favorable interfacial properties between the glass fiber and matrix. The glass fiber surfaces were further observed by SEM after removing the matrix PA6 with a solvent, the results showed that PA6 macromolecules were grafted onto the surface. Furthermore, the grafting amount of PA6 was increased with SSP time.

SEM images of impact fracture surfaces of LGF/PA6 composites (left) and of glass fiber surfaces after removing PA6 with 5 h SSP (right).