共查询到20条相似文献,搜索用时 133 毫秒
1.
利用双螺杆挤出机,通过熔融共混工艺制备了载货车内饰护板改性聚丙烯(PP)专用材料,并对专用料进行了力学性能测试.研究结果表明.以共聚PP为基体树脂、聚烯烃弹性体(POE)为增韧剂、滑石粒为填料制备的载货车内饰护板专用料·其缺口冲击强度达到18.6 kJ/m2,弯曲强度为30.2 MPa.拉伸强度达24.2 MPa,能满足载货车内饰护板类零部件的性能要求. 相似文献
2.
3.
4.
由天津石油化工公司研究院,乙烯厂共同承担的“可控流变聚丙烯(CRPP)纤维级系列专用料”新产品开发项目于2 0 0 4年3月2日通过验收。该项目为适应国内纺粘聚丙烯长丝无纺布生产迅速增长,针对聚丙烯专用料年需求已达40 0kt而开发的,由于纺粘聚丙烯专用料质量指标有较高要求,确认分子量调节剂的准确计量,以及母料与基础料的均匀混合是影响CRPP专用料熔体流动速率(MFR)波动的关键。通过小试、中试表明,这种纺粘聚丙烯专用料达到美国Exxon公司PP31 5 5 ,PP31 5 5E3的质量指标,其MFR波动可以控制在±1g/1 0min。纤维级聚丙烯专用料通过验… 相似文献
5.
6.
7.
8.
9.
聚丙烯(PP)由于具有价格低、原材料丰富、力学均衡性好、耐化学腐蚀等特点,近年来成为最热门的汽车零部件材料.本文以聚丙烯为基体树脂,热塑性丁苯橡胶(SBS)为主增韧剂,乙烯/醋酸乙烯共聚物(EVA)为辅助增韧剂,通过三元共混改性制备汽车仪表板专用料,并对改性的聚丙烯的材料的冲击强度、弯曲强度、弯曲模量、拉伸强度、断裂伸长率、收缩率、熔体流动速率进行测试.应用正交设计,确定了制备汽车仪表板专用料最佳配方. 相似文献
10.
11.
将经过改性的玻璃纤维(GF)以不同的含量加入到聚丙烯(PP)中,在二次开模条件下制备微发泡PP/GF复合材料,分析了不同含量GF对微发泡PP复合材料力学性能的影响。结果表明,GF具有明显的填充增强作用,当GF质量分数为20%时,微发泡PP复合材料的拉伸强度达到50.24 MPa,比未发泡纯PP的提高了59.5%;微发泡材料的冲击强度为7.37kJ/m2,发泡后材料的冲击强度与纯PP的相比提高了93.9%;发泡后材料密度相对于未发泡的显著下降。 相似文献
12.
以聚丙烯(PP)树脂为基体,加入玄武岩纤维(BF)和相关助剂,通过双螺杆挤出机熔融共混制得相应复合材料。考查相容剂对PP/BF复合材料性能影响、对PP/BF复合材料和PP/玻璃纤维(GF)复合材料力学性能、微观形貌和耐热氧老化等性能进行对比。通过实验数据分析,加入相容剂后,拉伸强度提高126.8%,弯曲强度提高223.8%,弯曲弹性模量提高119.9%,悬臂梁缺口冲击强度提高223.2%。在同样质量配比下,PP/BF复合材料较PP/GF复合材料拉伸强度提高9.8%,弯曲强度提高11.0%,弯曲弹性模量提高5.8%,悬臂梁缺口冲击强度降低10.7%。从微观电镜分析,加入相容剂可明显改善纤维与PP基材界面浸润程度。另外,BF比GF更易使复合材料老化,常规热氧老化剂1010和168对纤维增强PP类材料耐老化效果并不好,用等量自制热氧老化剂可解决此问题。 相似文献
13.
14.
《Polymer Composites》2017,38(12):2707-2717
Maleic anhydride‐grafted polypropylene (Ma‐PP) and β nucleation agents (β‐NA) were used to modify the glass fiber (GF)/isotactic polypropylene (iPP) composite. The interface adhesion, degree of orientation, and crystalline morphologies of the PP/GF composites molded by multiflow vibrate‐injection molding (MFVIM) and conventional injection molding (CIM) were studied by polarized light microscopy (PLM), scanning electronic microscopy (SEM), and X‐ray measurements. Results prove that the interface adhesion was improved by the Ma‐PP; γ crystal was generated by the MFVIM due to the instant high pressure and shear during the multiflow; and a hierarchical structure which has a strengthened skin and a toughened core was formed. As a result, the final PP/GF/β‐NA composite has a 60% increase in tensile strength and 80% improvement in impact strength compare with the CIM pure PP/GF composite. Based on the observations, a modified model is proposed to interpret the strengthening and toughening mechanism. Our work paves the way to obtain high‐performance GF/iPP composites. POLYM. COMPOS., 38:2707–2717, 2017. © 2015 Society of Plastics Engineers 相似文献
15.
玻纤增强聚丙烯复合材料性能研究 总被引:7,自引:1,他引:6
研究了玻纤(GF)、SEBS和聚丙烯接枝马来酸酐(PP-g-MAH)用量对GF增强聚丙烯复合材料性能的影响,以及PP/GF(65/35)、PP-g-MAH/PP/GF(15/65/35)的微观形态。结果表明:随着GF用量的增加,复合材料的拉伸强度、弯曲强度和弯曲模量增加,断裂伸长率降低,冲击强度先减小后增大,PP/GF复合材料断面呈脆性断裂;在PP/GF中添加增韧剂SEBS可以提高复合材料的冲击强度,但拉伸强度、断裂伸长率、弯曲强度和弯曲模量均减小;在PP/GF中添加增容剂PP-g-MAH,可使其拉伸强度、断裂伸长率、弯曲强度、弯曲模量和冲击强度均得到提高,当PP-g-MAH/PP/GF为15/65/35时,复合材料性能优异,材料断面呈韧性断裂。 相似文献
16.
The volume resistivity and percolation thresholds of carbon black (CB) filled polypropylene (PP), PP/epoxy, and PP/epoxy/glass fiber (GF) composites were measured. The morphology of these conductive polymer composites was studied with scanning electron microscopy (SEM). The effects of the GF and epoxy contents on the volume resistivity were also investigated. The PP/epoxy/GF/CB composite exhibited a reduced percolation threshold, in comparison with that of the PP/CB and PP/epoxy/CB composites. At a given CB content, the PP/epoxy/GF/CB composite had a lower volume resistivity than the PP/CB and PP/epoxy/CB composites. SEM micrographs showed that CB aggregates formed chainlike structures and dispersed homogeneously within the PP matrix. The addition of the epoxy resin to PP resulted in the preferential location of CB in epoxy, whereas in the PP/epoxy/GF multiphase blends, because of the good affinity of CB to epoxy and of epoxy to GF, CB particles were located in the epoxy phase coated on GF. The decreased percolation threshold and volume resistivity indicated that conductive paths existed in the PP/epoxy/GF/CB composite. The conductive paths were probably formed through the interconnection of GF. Appropriate amounts of GF and epoxy should be used to decrease the volume resistivity and provide sufficient epoxy coating. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1142–1149, 2005 相似文献
17.
18.
19.
20.
将酸刻蚀后的玻璃纤维(GF)网引入聚丙烯(PP)基体,通过热压成型技术制备PP/GF复合膜。综合利用X射线衍射仪、差示扫描量热仪、扫描电子显微镜和万能材料试验机对PP/GF复合膜的结晶结构、热行为、界面结合形态和力学性能进行表征分析,重点讨论GF含量对微结构及性能的影响。结果表明,经酸刻蚀后GF表面形成许多沟槽,粗糙度增大,提高了GF与PP基体间的界面结合强度;GF网的引入使成核点增多,结晶度增加;GF含量较低时,PP/GF复合膜的力学性能与PP相比显著提高,GF含量为0.2 %(质量分数,下同)时,PP/GF复合膜的拉伸强度和断裂韧性分别提高了33.75 %和41.15 %;随GF含量的增加,拉伸强度和断裂韧性呈减小的趋势。 相似文献