多元复合高流动性聚丙烯的制备与性能

研究了滑石粉(Talc)及偶联剂用量、均聚聚丙烯(PP-H)与马来酸酐接枝物(PP-g-MAH)及PP-H对高流动性共聚聚丙烯(PP)性能的影响;比较了在填充20%Talc的共聚PP中分别添加PP-g-MAH和PP-H的复合体系力学性能及流变性能的变化规律。结果表明:钛酸酯偶联剂用量为1%(相对于Talc)时,所得Talc填充共聚PP综合性能最佳;当Talc用量大于10%时,共聚PP/Talc复合材料的拉伸强度、冲击强度、弯曲强度、熔体流动速率随Talc含量的增加而逐渐下降,弯曲模量则逐渐提高;PP-g-MAH对高流动性共聚PP的拉伸强度增强效果明显优于PP-H,PP-H则使共聚PP的熔体流动性明显下降。     

玻纤增强聚丙烯复合材料性能研究

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。     

聚丙烯/滑石粉复合材料的制备及其力学性能北大核心

用经偶联剂改性的滑石粉(Talc)与聚丙烯(PP)共混制备PP/Talc复合材料,测试了复合材料的拉伸强度、弯曲强度和冲击强度等,并探讨了Talc含量对复合材料力学性能的影响机理。结果表明:Talc含量对复合材料力学性能有明显影响,复合材料的拉伸强度、弯曲强度和冲击强度均随Talc含量的增加而增大,但均会出现拐点,即当Talc含量分别超过18%,20%,8%时,复合材料的拉伸强度、弯曲强度和冲击强度却随Talc含量的增加而逐步降低。     

动态固化增容聚丙烯/长玻璃纤维复合材料的研究

将动态固化技术应用于热塑性树脂/热固性树脂体系,制备动态固化聚丙烯(PP)/Jg氧树脂(EP)/长玻璃纤维(LGF)共混物.研究动态固化聚丙烯/环氧树脂/玻璃纤维共混物的力学性能和热性能,并用电子扫描显微镜考察共混物的微观形态.试验结果表明:当EP质量含量为4%时,试样的拉伸强度和弯曲强度达到最大值,共混物的弯曲模量随EP含量的增加而增加;在体系中加入EP会降低维卡软化点温度.     

聚丙烯/马来酸酐接枝聚丙烯/环氧树脂/玻璃纤维复合材料的制备及其性能研究

通过双螺杆挤出机制备了聚丙烯/马来酸酐接枝聚丙烯/环氧树脂/玻璃纤维（PP/PP-g-MAH/EP/GF）复合材料,并研究了PP-g-MAH含量、EP含量及固化剂对复合材料力学性能的影响。结果表明,PP-g-MAH含量为10份,含有固化剂EP的含量为3份时,复合材料的综合力学性能最佳;与不加EP的复合材料相比,其拉伸强度、弯曲强度、冲击强度分别提高了41 %、47 %、86 %。扫描电子显微镜分析表明,EP的加入明显改善了GF和PP基体的黏结强度。     

SIVO408改性硅灰石在聚丙烯树脂中的应用研究

文章采用低聚短链烷基硅烷SIVO408对硅灰石进行表面改性,然后与聚丙烯树脂(PP)熔融共混制备PP树脂基复合材料,研究了改性硅灰石的填充份数对PP树脂基复合材料的密度、熔体流动速率、热变形温度、拉伸强度、弯曲强度和弯曲模量等性能的影响。结果表明：改性硅灰石的加入增大了PP树脂基复合材料的密度,与纯PP树脂相比,填充30份改性硅灰石的PP树脂基复合材料的密度从0.898 g/cm³增大到1.049 g/cm³;显著改善了PP树脂基复合材料的热性能,硅灰石添加份数为20份时其热变形温度达到最高值82.5℃,升高了9.9℃(13.6%)。重要的是,改性硅灰石在高填充量的情况下基本不会影响PP树脂基复合材料的加工流动性和拉伸强度,明显提高了PP树脂基复合材料的弯曲强度和弯曲模量,硅灰石添加份数为25份时PP树脂基复合材料的弯曲强度达到最大值35.890 MPa,增加了3.5410 MPa(10.9%),硅灰石添加份数为30份时PP树脂基复合材料的弯曲模量最大为1 709.50 MPa,增加了435.40 MPa(34.2%)。     

聚丙烯/滑石粉复合材料的制备及其力学性能

用经偶联剂改性的滑石粉(Talc)与聚丙烯(PP)共混制备PP/Talc复合材料,测试了复合材料的拉伸强度、弯曲强度和冲击强度等,并探讨了Talc含量对复合材料力学性能的影响机理。结果表明:Talc含量对复合材料力学性能有明显影响,复合材料的拉伸强度、弯曲强度和冲击强度均随Talc含量的增加而增大,但均会出现拐点,即当Talc含量分别超过18%,20%,8%时,复合材料的拉伸强度、弯曲强度和冲击强度却随Talc含量的增加而逐步降低。     

聚丙烯／碳酸钙复合材料的研制

文章以注塑级PP为基础料,以1250目碳酸钙对其进行填充改性,采用钛酸酯偶联剂对碳酸钙进行表面处理可得到活化碳酸钙,随活化碳酸钙添加量增加,PP／碳酸钙复合材料的拉伸强度、弯曲强度、弯曲模量等逐渐增加。以POE对PP／碳酸钙复合材料进行增韧改性,可使复合材料的冲击强度逐渐增加,而拉伸强度、弯曲模量均逐渐降低。表面改性剂TAS-2能够明显地改善PP／碳酸钙复合材料的表面光滑性。     

动态固化聚丙烯／环氧树脂共混物流变性能与热性能研究

研究了马来酸酐接枝聚丙烯（MAH-g-PP）增容的动态固化PP饼氧树脂（EP）共混物的流变性能和热性能。实验结果表明，动态固化PP／EP／MAH—g—PP共混物属于假塑性流体，与PP／EP共混物相比，动态固化共混物表观黏度明显增加，随EP用量的增加，动态固化PP／EP／MAH-g-PP共混物的表观黏度逐渐增大。动态固化PP／EP／MAH-g—PP共混物维卡软化点明显高于PP，当EP的用量超过10质量％，共混物的维卡软化点反而有所下降。动态固化PP／EP／MAH-g-PP共混物具有较好的热稳定性，随EP用量的增加，共混物的热稳定性有所提高。     

PP-g-MAH增容膨胀阻燃聚丙烯体系的研究

利用熔融共混制备了聚丙烯/膨胀型阻燃剂/马来酸酐接枝聚丙烯(PP/IFR/PP-g-MAH)阻燃复合材料。通过极限氧指数、热重分析、扫描电子显微镜及力学性能测试研究了PP-g-MAH对阻燃复合材料的阻燃性、热稳定性、微观形貌及力学性能的影响。结果表明,PP-g-MAH作为相容剂,当添加5 %的PP-g-MAH时,复合材料的极限氧指数达到30 %, 垂直燃烧达到UL 94 V-0级;随着PP-g-MAH含量的增加,阻燃剂和基体PP之间的界面作用力提高,体系的拉伸强度和弯曲强度均有提升,冲击强度减小幅度不大;与未加PP-g-MAH的复合材料相比,添加相容剂的复合材料成炭率明显提高。     

Study of dynamically cured PP/MAH‐g‐PP/talc/epoxy composites

In the present study, an epoxy resin was dynamically cured in a polypropylene (PP)/maleic anhydride–grafted PP (MAH‐g‐PP)/talc matrix to prepare dynamically cured PP/MAH‐g‐PP/talc/epoxy composites. An increase in the torque at equilibrium showed that epoxy resin in the PP/MAH‐g‐PP/talc composites had been cured by 2‐ethylene‐4‐methane‐imidazole. Scanning electron microscopy analysis showed that MAH‐g‐PP and an epoxy resin had effectively increased the interaction adhesion between PP and the talc in the PP/talc composites. Dynamic curing of the epoxy resin further increased the interaction adhesion. The dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had higher crystallization peaks than did the PP/talc composites. Thermogravimetric analysis showed that the addition of MAH‐g‐PP and the epoxy resin into the PP/talc composites caused an obvious improvement in the thermal stability. The dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had the best thermal stability of all the PP/talc composites. The PP/MAH‐g‐PP/talc/epoxy composites had better mechanical properties than did the PP/MAH‐g‐PP/talc composites, and the dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had the best mechanical properties of all the PP/talc composites, which can be attributed to the better interaction adhesion between the PP and the talc. The suitable content of epoxy resin in the composites was about 5 wt %. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006     

增容PP/废弃PET织物纤维复合材料的结构与性能

用马来酸酐接枝聚丙烯(PP-g-MAH)、甲基丙烯酸甲酯和苯乙烯的混合物(MMA/St)两种相容剂对PP和废弃的PET织物(WF)复合材料界面进行改性,研究其力学性能、微观形态和热行为.结果表明:WF的加入使PP的拉伸强度下降,但改善了弯曲强度和模量,更使冲击强度大幅提升.在高WF填充量时,PP-g-MAH改性有助于改善弯曲性能和韧性,MMA/St混合物改性则对拉伸性能和弯曲性能更有利.挤出共混可使WF织物在PP中实现单纤维分散,PP-g-MAH和MMA/St改性改善了WF和PP的分散和界面粘结,MMA/St改性效果更优.这3类PP/WF复合材料的热稳定性都有所提高.     

Dynamically cured polypropylene/epoxy blends

The dynamic vulcanization process, usually used for the preparation of thermoplastic elastomers, was used to prepare polypropylene (PP)/epoxy blends. The blends had crosslinked epoxy resin particles finely dispersed in the PP matrix, and they were called dynamically cured PP/epoxy blends. Maleic anhydride grafted polypropylene (MAH‐g‐PP) was used as a compatibilizer. The effects of the reactive compatibilization and dynamic cure were studied with rheometry, capillary rheometry, and scanning electron microscopy (SEM). The crystallization behavior and mechanical properties of PP/epoxy, PP/MAH‐g‐PP/epoxy, and dynamically cured PP/epoxy blends were also investigated. The increase in the torque at equilibrium for the PP/MAH‐g‐PP/epoxy blends indicated the reaction between maleic anhydride groups of MAH‐g‐PP and the epoxy resin. The torque at equilibrium of the dynamically cured PP/epoxy blends increased with increasing epoxy resin content. Capillary rheological measurements also showed that the addition of MAH‐g‐PP or an increasing epoxy resin content increased the viscosity of PP/epoxy blends. SEM micrographs indicated that the PP/epoxy blends compatibilized with PP/MAH‐g‐PP had finer domains and more obscure boundaries than the PP/epoxy blends. A shift of the crystallization peak to a higher temperature for all the PP/epoxy blends indicated that uncured and cured epoxy resin particles in the blends could act as effective nucleating agents. The spherulites of pure PP were larger than those of PP in the PP/epoxy, PP/MAH‐g‐PP/epoxy, and dynamically cured PP/epoxy blends, as measured by polarized optical microscopy. The dynamically cured PP/epoxy blends had better mechanical properties than the PP/epoxy and PP/MAH‐g‐PP/epoxy blends. With increasing epoxy resin content, the flexural modulus of all the blends increased significantly, and the impact strength and tensile strength increased slightly, whereas the elongation at break decreased dramatically. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1437–1448, 2004     

聚丙烯/弹性体/滑石粉三元共混体系的尺寸收缩与性能研究

系统研究了乙烯-辛烯共聚物(POE)和Vistamaxx两种弹性体对滑石粉改性聚丙烯(PP)共混体系的尺寸收缩率、力学性能和结晶行为的影响.结果表明,随着弹性体用量的增加,材料的收缩率、拉伸强度、弯曲强度和弯曲弹性模量下降,断裂伸长率和冲击强度上升;POE对PP的结晶影响不大,Vistamaxx质量分数为20％时对PP...     

Dynamically cured PP/MAH-g-SEBS/epoxy blends

Abstract

A new method concerning the simultaneous reinforcing and toughening of polypropylene (PP) is reported. Dynamic cure of the epoxy resin with 2-ethylene-4-methane-imidazole was successfully applied in the PP/maleic anhydride grafted styrene–ethylene–butylene–styrene (MAH-g-SEBS) triblock co-polymer, and the obtained blends were named as dynamically cured PP/MAH-g-SEBS/epoxy blends. The stiffness and toughness of the blends are in a good balance, and the smaller size of the epoxy particle in the PP/MAH-g-SEBS/epoxy blends shows that MAH-g-SEBS was also used as a compatibiliser. The structure of the dynamically cured PP/MAH-g-SEBS/epoxy blends is the embedding of the epoxy particles by MAH-g-SEBS. The cured epoxy particles as organic filler increase the stiffness of the PP/MAH-g-SEBS blends, and the improvement in the toughness is attributed to the embedded structure. The tensile strength and flexural modulus of the blends increase with increasing epoxy resin content, and the impact strength reaches a maximum of 342 J m^?1 at the epoxy resin content of 10wt-%. Differential scanning calorimetry analysis shows that the epoxy particles in the dynamically cured PP/MAH-g-SEBS/epoxy blends could have contained embedded MAH-g-SEBS, decreasing the nucleating effect of the epoxy resin. Wide angle X-ray diffraction analysis shows that the dynamical cure and compatibilisation do not disturb the crystalline structure of PP in the blends.     

PP/滑石粉导热绝缘复合材料的制备与性能研究

采用聚丙烯(PP)为基体,不同粒径滑石粉为填料,通过双螺杆挤出机挤出制备导热绝缘的PP滑石粉复合材料。在滑石粉用量为3O%的条件下,探讨了粒径分别为3.6,6,12,30,50 μm的滑石粉对PP猾石粉复合材料的热导率、体积电阻率、力学性能和结晶性能的影响。结果表明,随着滑石粉粒径的减小,复合材料的拉伸强度和弯曲强度呈先增大后减小的变化趋势,而其热导率则呈先减小后增大的变化趋势。填充粒径为12μm的滑石粉时,复合材料的拉伸强度和弯曲强度达到最大值,分别为29.92MPa和52.58MPa,比纯PP分别提高了5.5%和12.8%。填充粒径为50μm的滑石粉时,复合材料的热导率最大,达到0.3237W/(m*K),比纯PP提高了32.7%。填充1:l的粒径为12μm和30μm滑石粉混合物时,PP复合材料的热导率为0.3184W/(m*K),高于相应的填充单一粒径滑石粉的PP复合材料。此外,所制备的PP滑石粉复合材料的体积电阻率均大于10^8Ω*cm     

界面改性剂对PP/滑石粉形态结构和性能影响

用在50L固相接枝反应器中合成的等规聚丙烯接枝马来酸酐(PP-g—MAH)作界面改性剂，制备了PP—g—MAH／PP／滑石粉复合材料。研究了PP—g—MAH／PP／滑石粉复合材料的形态结构和力学性能。结果表明，PP—g—MAH对PP／滑石粉复合物的缺口冲击强度、弯曲强度和拉伸强度均有增强作用；PP—g—MAH对PP／滑石粉复合物表观粘度几乎没有影响。SEM观察发现PP—g—MAH对PP／滑石粉复合物相界面有明显的改善。