马来酸酐接枝聚丙烯的进展

马来酸酐接枝聚丙烯是拓宽聚丙烯应用领域的重要手段之一,本文综述了马来酸酐接枝聚丙烯的接枝方法和原理,接枝物的性能以及接枝物在聚丙烯合金和共混物、复合材料、粘合剂和涂料领域的广泛应用。     

马来酸酐接枝改性聚丙烯流变性能研究

用固相接法制得马来酸酐接枝聚丙烯，接枝率为２％～２．５％（１００ｇＰＰ含马来酸酐的克数），用国产ＸＬＹ－Ⅱ型毛细管流变仪进行了流变性能研究。     

马来酸酐接枝聚丙烯的研究

本文以二甲苯为溶剂,BPO为引发剂并采用滴加引发剂的方法合成了马来酸酐(MAH)接枝PP树脂。在研制过程中,考察了引发剂用量,MAH与引发剂的配比、溶剂用量,引发剂滴加时间对PP接枝率和产率的影响,结果表明,接枝率随引发剂用量的增加而相应提高,因此可以通过控制引发剂用量来控制接枝率,引发剂用量对产率影响不大;随MAH/BPO比例的增加,接枝率有增加的趋势,但产率有明显下降;溶剂用量对接枝率无大影响,但产率随溶剂用量增加而降低;随引发剂滴加时间的延长,接枝率有明显提高,而产率无明显变化。     

聚丙烯熔融接枝马来酸酐的研究

研究了聚丙烯熔融接枝顺丁烯二酸酐（ＭＡＨ）过程中ＭＡＨ的均聚、支化和过氧化二异丙苯（ＤＣＰ）分解速率等问题，用同向双螺杆挤出机，在固定螺杆转速下。考察了ＭＡＨ、ＤＣＰ加入量和挤出温度对接枝聚合物中游离酸酐含量、接枝率及ＭＦＲ的影响，并初步研究了游离酸酐对反应性共混物ＲＰＳ／ＰＰ－ｇ－ＭＡＨ拉伸性能的影响。     

马来酸酐接枝聚丙烯研究进展

介绍了马来酸酐接枝聚丙烯的方法、机理,并重点介绍了溶液法和共单体熔融法影响接枝率的因素。     

聚丙烯接枝马来酸酐接枝率的测定

本文讨论了两种适用于聚丙烯接枝马来酸酐接枝率测定的定量校正曲线及半经验定量公式的建立方法。两种方法对ＰＰ熔融挤出接枝样品的接枝率进行测定的结果相近。     

马来酸酐接枝改性聚丙烯及其在木塑复合材料中的应用

通过双螺杆挤出机聚丙烯熔融挤出接枝马来酸酐制备马来酸酐接枝聚丙烯（PP-g-MAH）;研究了接枝单体马来酸酐（MAH）、引发剂DCP及共单体St等对聚丙烯（PP）熔融接枝MAH的接枝率的影响。将制备的接枝物应用于木塑复合材料中,发现木粉与聚丙烯之间的界面结合有了明显的改善,添加的PP-g-MAH增强了木粉和聚丙烯基体之间的黏合性,使两相结合得更紧密,进而提高了木塑复合材料的力学性能。     

马来酸酐熔融接枝聚丙烯的研究

在双螺杆挤出机上研制马来酸酐（MAH）接枝的聚丙烯（PP）。主要讨论了聚丙烯（PP）与马来酸酐（MAH）在熔融挤出反应中,引发剂DCP、MAH的用量以及反应温度、物料的停留时间对接枝物的影响。     

马来酸酐接枝聚丙烯增容聚丙烯/碳酸钙复合物力学性能与增容机理

用在50L固相接枝反应器中合成的马来酸酐接枝聚丙烯(PP-g-MAH)作界面改性剂，制备了马来酸酐接枝聚丙烯／聚丙烯／碳酸钙(i-PP／PP-g-MAH／CaCO3)复合材料。研究了i-PP／PP-g-MAH／CaCO3复合材料的力学性能和增容机理。结果表明，PP-g-MAH对i-PP／CaCO3复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高；PP-g-MAH与CaCO3反应形成PP-g-MAH的钙盐，实现反应性增容。     

聚丙烯紫外辐照气相接枝马来酸酐

在６０℃、氮气气氛下,用低能量紫外辐照聚丙烯,进行聚丙烯的气相马来酸酐接枝。红外分析显示,在所选择的实验条件下,马来酸酐已经接枝到聚丙烯的分子链上。用重量法计算了马来酸酐的接枝率。实验结果表明,接枝聚丙烯（ＰＰ－ｇ－ＭＡＨ）的熔体流动速率和马来酸酐的接枝率随紫外辐射时间的增加而增加;紫外辐照时间保持不变,ＰＰ－ｇ－ＭＡＨ的溶体流动速率基本相同。     

Effect of maleic anhydride grafted polypropylene compatibilizer on the morphology and properties of polypropylene/multiwalled carbon nanotube composite

The effect of maleic anhydride grafted polypropylene (MA‐g‐PP) compatibilizer on the mechanical and electrical properties of a polypropylene‐carbon nanotube composite is presented. Commercially available grades of polypropylene homopolymer (PP) and multiwalled CNT (MCNT) were used to prepare composites (PP/MCNT) by melt compounding. The effects of maleic anhydride graft level and loading on material properties were investigated. The addition of MCNT without compatibilizer enhanced the mechanical properties of PP, whereas addition of both grades of MA‐g‐PP alone had a detrimental effect. When MA‐g‐PP was added as a compatiblizer to the PP/MCNT composite, flexural and tensile moduli increased, indicating that enhanced levels of MCNT dispersion within PP had been achieved. Strength of the nanocomposite decreased with the addition of both grades of MA‐g‐PP, possibly due to the deterioration of the mechanical properties of the polymer in the presence of lower molecular weight MA‐g‐PP. Electrical resistivity improved with both grades of MA‐g‐PP, with higher maleic anhydride graft levels having the most significant effect. Scanning electron microscopy analysis confirmed that the optimum state of dispersion was for the nanocomposite prepared with MA‐g‐PP with highest grafting level. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers     

马来酸酐接枝SEBS增容聚丙烯／剑麻复合材料的力学与断裂行为

通过力学性能测试发现,在聚丙烯／剑麻复合材料咖入适量的马来酸酐接枝SEBS,能有效地提高复合材料的强度,阻止的裂纹的引发和扩展,对聚丙烯／剑麻复合材料起到了增韧作用。     

Preparation and characterization of maleic anhydride grafted SEBS/silica composites through modification by ethanolamine

Polymer Bulletin - In our previous study, SEBS was first grafted by using maleic anhydride (MA) to form SEBS-g-MA, and it was then modified by ethanolamine (EA), which was noted as EA modified...     

Improved compatibility between polyamide and polypropylene by the use of maleic anhydride grafted SEBS

Blends containing equal weight fractions of polypropylene (PP) and polyamide (PA-6 and PA-6.6) and up to 25% of a compatibilizing thermoplastic elastomer, either polystyrene-block-poly(ethylene-stat-butylene)-block-polystyrene (SEBS) or SEBS modified by maleic anhydride (SEBS-MA), were prepared by melt mixing. In all these blends, PP formed the continuous matrix phase. Even at high concentrations, unmodified SEBS was found to be a poor compatibilizer, affecting mainly the properties of the matrix. The graft copolymer formed, by reaction between SEBS-MA and polyamide during melt mixing, strongly influenced the blend morphology, by forming an interphase, separating the PA phase domains from the matrix. The crystallization behaviour of PP indicated that full coverage required between 3% and 5% SEBS-MA at the intense mixing conditions used. Above this level, the total surface area of the polyamide domains seemed to increase in direct proportion to the concentration of SEBS-MA. The thickness of the interphase layer was estimated to be about 15 nm. At high concentrations of SEBS-MA, the PA domains agglomerated and formed extended structures held together by the interphase polymer. This was reflected by the stress–strain and rheological behaviour of the blends. In blends with PA domains of small volume, crystallization of PA was delayed. The rate of water absorption was very low in blends containing SEBS-MA, much lower than in corresponding blends containing SEBS.     

Mechanical properties of maleic anhydride treated jute fibre/polypropylene composites

Abstract

The effect of maleic anhydride (MA) modification of jute fibre on the mechanical properties of jute/polypropylene (PP) composites was studied. Jute fibre, an environmental friendly, low-density renewable material was chemically modified with MA before the incorporation with PP to improve interfacial adhesion between them. Fourier transform infrared (FTIR) study showed that the C=C groups of MA attached to jute cellulose reacted with the PP matrix. Jute fibre/PP composite treated with MA displayed higher Young's modulus and dynamic storage modulus owing to the enhanced interfacial adhesion between the fibre and PP matrix. A scanning electron microscopy (SEM) study showed evidence of the enhanced adhesion and bridging in the interfacial region of the composite as the result of MA modification of jute fibre.     

氯化聚丙烯接枝马来酸酐的研究

为了进一步提高氯化聚丙烯接枝马来酸酐的接枝率,优化工艺条件和不同组分的用量,采用正交实验法,研究了马来酸酐(MAH)用量、引发剂过氧化苯甲酰(BPO)用量、反应温度和反应时间对氯化聚丙烯接枝马来酸酐接枝率的影响。结果表明,引发剂BPO用量对接枝率的影响最为明显,而反应时间相对最弱。4种因素的极差递减顺序为:引发剂BPO用量、MAH用量、反应温度和反应时间。     

氯化改性马来酸酐接枝的聚丙烯研究

采用氯化改性的方法改性马来酸酐接枝的聚丙烯。研究了反应温度、反应时间和引发剂浓度对马来酸酐化的聚丙烯氯化度的影响,得出了较佳的工艺条件是:反应温度110℃,反应时间5 h,引发剂与马来酸酐化的聚丙烯质量配比为0.5:100。     

Kinetics for chlorination of maleic anhydride grafted polypropylene

Preparation of Chlorinated maleic anhydride grafted polypropylene (Cl‐PP‐g‐MAH) by free radical process was carried out using carbon tetrachloride (CCl₄) as the solvent and benzoperoxide (BPO) as the initiator. Effects of reaction temperature, concentrations of PP‐g‐MAH and BPO on the rate of chlorination were studied. The experimental results showed the actual rate constant for chlorination of maleic anhydride grafted polypropylene followed the Arrhenius law and the total apparent activation energy was 19.7 kJ mol^?1. The kinetic model for chlorination of maleic anhydride grafted polypropylene was found to be R = K[BPO]^0.53[C]^0.93. The properties of chlorination of maleic anhydride grafted polypropylene were better than those of maleic anhydride grafted polypropylene. The products were characterized by Fourier transform infrared spectroscopy. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Morphology,deformation behavior and thermomechanical properties of polypropylene/maleic anhydride grafted polypropylene/layered silicate nanocomposites

Nanocomposites polypropylene (PP) with 3 and 7 wt % of clay were prepared by melt mixing. Four types of maleic anhydride grafted PP (MAPP) in broad range of MA groups content (0.3–4 wt %) and molecular weights (MW) were used as polar compatibilizers. The effect of the MAPP kind on both the clay dispersion and miscibility with PP was studied. The mixed intercalated/exfoliated morphologies of nanocomposites in the presence of all studied compatibilizers were revealed by XRD and TEM. The oligomer compatibilizer with 4 wt % of MA groups increases the intercalation ability of polymer into clay galleries but this one has limited miscibility with PP and worsens crystalline structure of polymer matrix. The MAPPs with 0.3–1.3% of MA are characterized by the lower intercalation ability but well cocrystallize with PP. Maximum reinforcing effect is attained using high MW MAPP with 0.6% MA and for nanocomposite with 7 wt % (3.8 vol %) of clay it averages almost 1.7 times relative to neat PP and 1.3 times relative to noncompatibilized composite. Dynamic storage moduli of nanocomposites compatibilized by MAPPs with 0.3–1.3% of MA containing 7 wt % of clay increase up to 1.4–1.5 around 30–75°C and over the whole temperature range remain higher compared with both neat PP and uncompatibilized composite. On the contrary, the oligomer MAPP with 4 wt % of MA groups decreases the thermal–mechanical stability of nanocomposite at high temperature compared with both PP and uncompatibilized composites. The study of nanocomposites flammability showed that creating complex composites containing both layered silicate and relatively small amount of magnesium hydroxide can be a successful approach to reduce the combustibility of PP‐based nanocomposites. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Morphology and thermal properties of maleic anhydride grafted polypropylene/ethylene–vinyl acetate copolymer/wood powder blend composites

Maleic anhydride grafted polypropylene (MAPP) was blended with ethylene–vinyl acetate (EVA) copolymer to form MAPP/EVA polymer blends. Wood powder (WP) was mixed into these blends at different weight fractions to form MAPP/EVA/WP blend composites. Differential scanning calorimetry (DSC) analysis of the blends showed small melting peaks between those of EVA and MAPP, which indicated interaction and cocrystallization of fractions of EVA and MAPP. The presence of MAPP influenced the EVA crystallization behavior, whereas the MAPP crystallization was not affected by the presence of EVA. Scanning electron microscopy, Fourier transform infrared spectroscopy, and DSC results show that the WP particles in the MAPP/EVA blend were in contact with both the MAPP and EVA phases and that there seemed to be chemical interaction between the different functional groups. This influenced the crystallization behavior, especially of the MAPP phase. The thermogravimetric analysis results show that the MAPP/EVA blend had two degradation steps. An increase in the WP content in the blend composite led to an increase in the onset of the second degradation step but a decrease in onset of the first degradation step. The presence of WP in the blend led to an increase in the modulus but had almost no influence on the tensile strength of the blend. The dynamic mechanical analysis results confirm the interaction between EVA and MAPP and show that the presence of WP only slightly influenced the dynamic mechanical properties. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010