丙烯酸改性卤锑阻燃PP的阻燃性能

用双螺杆挤出机制备了丙烯酸(AA)改性三氧化二锑／聚丙烯(Sb2O3／PP)母料、十溴联苯醚(DBDPO)／PP母料及其相应的卤锑阻燃PP。研究了Sb2O3、DBDPO和卤锑阻燃剂阻燃PP的氧指数(LOI)。结果表明，Sb2％用量对PP的L01影响不大，而DBDPO使PP的L01明显提高，但Sb2O3与DBDPO有协同作用，可使DBDPO用量降低。然而，当阻燃剂质量分数高于5％，Sb2O3与DBDPO的协同作用降低。AA改性对PP的L01有影响，取决于AA的用量和引发剂的用量。     

反应性单体丙烯酸改性Sb2 O3填充PP的热降解行为

用双螺杆挤出机制备了三氧化二锑／聚丙烯(Sb2O3／PP)和有无引发剂DCP存在下丙稀酸(AA)改性Sb2O3／PP。用TGA方法研究了制备样品的热降解行为。结果表明Sb2O3的加入明显提高了PP的热分解温度和热稳定性。反应性单体丙烯酸改性可改善Sb2O3与PP的界面相互作用和填料的分散性,而对Sb2O3的热降解行为无大的影响。     

丙烯酸改性卤锑阻燃PP的力学性能

在过氧化二异丙苯(DCF)存在或不存在条件下,制备了丙烯酸(AA)改性Sb2O3／聚丙烯(PP)母料、十溴联苯醚／PP母料及其相应的卤锑阻燃PP。研究了Sb2O3、十溴联苯醚和不同含量卤锑阻燃剂对PP力学性能的影响。结果表明,随Sb2O3含量增加,PP的拉伸和弯曲性能提高,缺口冲击强度降低。对于改性阻燃PP,无DCP时,加入AA有利于阻燃PP拉伸强度提高。但对其他力学性能影响不大。添加DCP提高了PP的弯曲强度。但AA用量高时,缺口冲击强度降低。AA改性阻燃PP的力学性能随着DCP用量增加而降低,尤其缺口冲击强度。退火处理使阻燃PP力学性能提高。     

高密度聚乙烯阻燃抗静电性能研究

以十溴联苯醚(DBDPO)和三氧化二锑(Sb2O3)为阻燃剂制备阻燃母料,并对高密度聚乙烯(HDPE)进行阻燃改性;以十二烷基苯磺酸钠(SDBS)为抗静电剂对HDPE进行电性能改性。对改性HDPE材料进行氧指数、扫描电镜、熔体流动速率、电阻率等测试表征。结果表明:当阻燃母料用量为25%,SDBS用量为10%时,改性HDPE材料的综合性能优异,氧指数为27.5%,拉伸强度为25.4 MPa,断裂伸长率为476%,缺口冲击强度为6.04 k J/m2,熔体流动速率为11.02 g/10min,初始分解温度为370℃,体积电阻率为1.58×1010Ωcm,表面电阻率为2.0×109Ω。     

丙烯酸改性卤锑阻燃聚丙烯的结晶性能

研究了丙烯酸(AA)改性Sb2O3,聚丙烯(PP)母料制备的不同用量卤锑阻燃PP。阻燃PP的差示扫描量热法结果表明,阻燃剂在PP中存在明显的异相成核作用,使PP结晶温度提高,Sb2O3对PP的异相成核作用比十溴二苯醚明显。在无引发剂过氧化二异丙苯(DCP)存在下,AA对阻燃PP中PP结晶温度的影响取决于阻燃剂的用量;在DCP存在下,PP的结晶温度不随AA用量增加而改变。DCP用量增加导致PP严重降解,结晶温度与熔融温度降低。     

聚丙烯／丙烯酸酯原位聚合改性纳米Sb2O3复合材料的微结构

分别以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为单体．通过原位聚合对纳米Sb1O2进行改性．研究了Sb2O3／MMA体系的原位聚合反应和处理后Sb2O3的粒径分布。改性后的Sb2O3与聚丙烯(PP)熔融复合制备PP／Sb2O3复合材料．利用扫描电子显微镜(SEM)表征复合材料的微观结构。结果表明Sb2O3对MMA的聚合反应无阻聚作用．表面包覆的聚甲基丙烯酸甲酯(PMMA)能有效地解决纳米Sb2O3粒子自身团聚的问题，同时也增强了PP基体与Sb2O3之间的相互作用，使Sb2O3以纳米尺寸分散在PP基体中，但随着纳米Sb2O3填充量的增加．纳米Sb2O3亦存在团聚的倾向。而纳米Sb2O3表面包覆PBA后，纳米Sb2O3以更小的尺寸分散在PP基体中．纳米Sb2O3填充量增加后．纳米Sb2O3亦能以纳米尺寸分散在PP基体中。     

PP/改性纳米CaCO3复合材料力学性能与断裂形态研究

制备了反应性单体改性纳米CaCO3填充PP复合材料，研究了反应性单体丙烯酸(AA)和苯乙烯(St)在有、无过氧化二异丙苯(DCP)存在下改性纳米CaCO3填充PP复合材料的力学性能，并用扫描电子显微镜(SEM)研究了复合材料弯曲断面的形态。结果表明，PP／改性纳米CaCO3的力学性能优于PP／微米CaCO3的力学性能；在DCP存在下，AA、AA与St混合改性可使PP／纳米CaCO3的拉伸性能和弯曲性能提高，减小拉伸强度随CaCO3含量增加而下降的趋势；并可有效提高纳米CaCO3在基体中的分散性和界面粘结性。     

增刚母料在BOPP烟包装膜中的应用

通过在聚丙烯(PP)中添加自主研发的增刚母料,研究增刚母料对PP熔融与结晶性能的影响,以及增刚母料添加量对双向拉伸PP(BOPP)烟包装膜性能的影响.研究表明:当增刚母料质量分数为20％时,改性PP的熔体流动速率从PP的3.2 g/10 min提高到21.5 g/10 min,熔点降低10.2℃,结晶温度降低16.9℃...     

双单体改性对纳米CaCO3/PP结晶与熔融行为的影响

制备了界面改性纳米CaCO3／PP复合材料，用DSC研究了在有、无过氧化二异丙苯(DCP)存在下，反应单体丙烯酸(AA)及苯乙烯(St)对PP结晶与熔融行为的影响。结果表明：AA改性纳米CaCO3／PP可使结晶温度提高；St改性使纳米CaCO3／PP的结晶温度降低，但在DCP存在下结晶温度反而提高。AA和St双单体改性使纳米CaCO3／PP的结晶温度明显降低，但加有DCP的双单体改性却使纳米CaCO3／PP的结晶温度大幅提高，说明双单体接枝物有促进纳米CaCO3表面成核的作用。     

聚丙烯/间同1,2-聚丁二烯合金辐射稳定性的研究

采用密炼机共混方法制备不同配比聚丙烯(PP)/间同1,2-聚丁二烯(s-PB)合金。研究了PP、s-PB以及PP/s-PB合金在不同剂量电子束辐射后稳定性。采用拉力试验机、扫描电子显微镜和熔体流动测速仪分别进行了拉伸性能、微观形态和熔体流动速率测试。结果表明,辐照后PP/s-PB合金断裂伸长率与纯PP相比有了明显提高,同时PP与s-PB之间界面黏结力增强。s-PB的加入降低了PP的辐射敏感性。     

Investigation on preparation and property of nano‐CaCO3/PP masterbatch modified by reactive monomers

Nano‐CaCO₃/polypropylene (PP) masterbatch containing above 80 wt % nano‐CaCO₃ was prepared by nano‐CaCO₃ coated PP modified by reactive monomers. The chemical interaction, crystallization and melting behavior, thermal stability, morphology, and surface contact angle of masterbatch were investigated with IR, DSC, TEM, TGA, ESCA, and surface contact angle. The results indicated that nano‐CaCO₃ was coated by PP graft copolymers in the masterbatch modified by reactive monomers. The graft ratio and crystallization and melting behavior of PP in the masterbatch depended on the type and content of reactive monomer. The crystallization temperatures of masterbatch modified by reactive monomer is methyl methacrylate > butyl acrylate > methyl acrylate ≈ mixture of acrylic acid and styrene > unmodified ≈ maleic anhydride ≈ acrylic acid > styrene. Modification by reactive monomer increased the thermal stability and surface contact angle of masterbatch. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3907–3914, 2006     

增容ＰＰ／ＰＡ６共混物的界面相互作用

采用ＰＰ熔融接枝ＭＡＨ和不饱和羧酸混合单体通过反应挤出增容ＰＰ／ＰＰ６共混物,研究了增容共混物两相间的界面相互作用。通过Ｍolau实验,抽担实验、ＩＲ测试等证明：接枝物增容的ＰＰ／Ｐ６共混物,由于在熔融挤出共混过程中,接枝物的反应基团和ＰＡ６的端氨基基发生化学反应地生成了ＰＰ－g-PA6,使得共混物两相产生了较强的界面相互作用。     

Fracture morphology of Mg(OH)2/polypropylene composites modified by functionalized polypropylene

The morphologies of the fracture surface under impact and flexural testing of Mg(OH)₂/Polypropylene (PP) composites and their modified composites were investigated by scanning electron microscopy. Experimental results indicated that addition of functionalized polypropylene (FPP) and acrylic acid (AA) and the formation of in situ FPP changed the fracture morphologies of Mg(OH)₂/PP composites. We believe that addition of these modifiers improved the interfacial interaction and enhanced the interface adhesion between the particle and the matrix in Mg(OH)₂/PP composites. The degree of improvement was more significant in Mg(OH)₂/PP composites modified by the formation of in situ FPP. At low Mg(OH)₂ content, 2 phr AA exhibited a marked effect, but at high Mg(OH)₂ content, 4 phr AA afforded good effect. Due to the improved interface adhesion by interface interactions the fracture mechanism transformed from interface debonded fracture into a matrix fracture. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2148–2159, 2003     

Interfacial interaction in AI(OH)3/polypropylene composites modified by insitu‐functionalized polypropylene

To investigate the interfacial interaction of AI(OH)₃/polypropylene (PP) composites modified by in situ‐functionalized polypropylene (FPP), AI(OH)₃/polypropylene (PP) composites containing a low AI(OH)₃ content, modified by in situ‐grafted acrylic acid, were prepared by a one‐step melt‐extrusion process. The effect of in situ FPP on the crystallization and melting behavior, crystalline morphology of the composites, and interfacial interaction between the filler and PP was investigated. The crystallization and melting behavior and crystalline morphology of PP in the composites depended upon the interfacial physical [heterogeneous nucleation of AI(OH)₃; cocrystallization and compabilitization of PP with in situ FPP] and the interfacial chemical interaction between both the components in the composites. FTIR results indicated that there exists a chemical reaction between AI(OH)₃ and in situ FPP. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 110–120, 2002; DOI 10.1002/app.10270     

Mechanical properties and fracture morphology of Al(OH)3/polypropylene composites modified by PP grafting with acrylic acid

Al(OH)₃/polypropylene (PP) composites modified by polypropylene grafted with acrylic acid (FPP) were prepared by melt extrusion. Effect of PP grafting with acrylic acid on mechanical properties and fracture morphology of Al(OH)₃/polypropylene composites were investigated. Although incorporation of Al(OH)₃ reduced the mechanical properties of PP, addition of FPP increased the mechanical properties of Al(OH)₃/PP composites. It is suggested that addition of FPP improve the dispersion of Al(OH)₃ and the interfacial interaction between filler and matrix. Mechanical properties of Al(OH)₃/FPP/PP composites depend on the grafting rate and the content of FPP. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2617–2623, 2001     

The effect of addition of poly(propylene‐g‐acrylic acid) on the morphology of poly(vinyl methylether) and isotactic polypropylene blend

The interfacial adhesion of blend of isotactic polypropylene/poly(vinyl methylether) (i‐PP/PVME) has been improved by the addition of poly(propylene‐g‐acrylic acid) (PP‐g‐AA) as a compatibilizing agent. The phase morphologies of the blends are investigated by optical microscopy (OM) and lateral force microscopy (LFM). The i‐PP/PVME (80/20) blend with no addition of PP‐g‐AA from extrusion process shows a coarse morphology with the dispersed domain size as large as several micrometers; After the addition of 2.5% PP‐g‐AA in the blends, the dispersed PVME domain size decreases greatly. The addition of 5% PP‐g‐AA results in a homogeneous morphology. The blending of PP‐g‐AA with PVME reduces the crystallization temperature of PP‐g‐AA, which is different from that of blending i‐PP with PVME. The increase of the interfacial adhesion is attributed to the specific intermolecular interaction between the acrylic acid group of PP‐g‐AA and the ether group of PVME. The specific interaction is studied by Fourier transform infrared spectroscopy. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4098–4103, 2006     

抗菌丙纶的制备及其性能研究

将抗菌丙纶母粒(含质量分数20％无机载银抗菌粒子)与PP进行熔融共混、切片,再通过熔融纺丝制得抗菌丙纶。扫描电镜观察经表面改性处理的无机抗菌粒子在丙纶中分散较好,大小均匀,且与PP基体具有良好的界面相容性;DSC测试表明:抗菌粒子对PP基体有异相成核作用,使PP结晶度和熔融温度略有提高;加入无机抗菌粒子,降低了丙纶的力学性能,添加量宜1％;通过改变纤维的拉伸倍数,提高抗菌丙纶的力学性能,拉伸倍数为8时,其力学性能最好;该抗菌丙纶对革兰氏阴性和阳性菌的杀菌率都大于99.9％,经水洗后仍有较好的抑菌效果,具有一定的长效抗菌性。