PP-g-DBM增容PP/PA6共混物的性能研究

采用ＰＰ－ｇ－ＤＢＭ增容ＰＰ／ＰＡ６共混物,研究了增容共混物的力学性能和流变行为。结果表明,ＰＰ－ｇ－ＤＢＭ能改善ＰＰ／ＰＡ６共混物的相容性,显著提高共混物的力学性能;增容共混物的假塑性行为变强,粘流活化能增加熔体流动速率下降。     

Studies on fracture behavior of tough PA6/PP blends

Fracture toughness of injection-molded PA6/PP blends compatibilized with SEBS-g-MA was studied using deeply double-edge notched tension (DDENT) specimens according to the essential work of fracture procedure. The fracture mechanical studies also included tensile impact tests on the DDENT specimens and characterization of the fracture surfaces by electron microscopy. The results were compared with those of traditional tensile tests and Izod impact tests on single-edge notched samples, and the sensibility of the methods was evaluated. Effects of sample position, ligament length, testing direction, and test speed were studied as well. It was found that the essential work of fracture concept, earlier applied to thin sheets, can also be applied to injection-molded tough blends. High deformation of the skin may, however, interfere with the measurements and cause a “tail” in the load-deformation curves. The plastic work of fracture (w_p) was found to correlate with the impact strength, and thus, it described the toughness. The highest values for work of fracture were recorded for the compatibilized blend with a PA6/PP ratio of 80/20. The essential work of fracture (w_e) in turn increased with increasing PA6 content and behaved like tensile strength. The test speed was found to affect the fracture behavior substantially: differences between the materials were more pronounced in high-speed tensile impact tests, which revealed signs of cavitation in addition to large-scale plastic deformation for the tough PA6-rich blend compositions. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 2209–2220, 1997     

Effect of the type of nylon chain‐end on the compatibilization of PP/PP‐GMA/nylon 6 blends

Polyamide and polypropylene (PP) are two important classes of commercial polymers; however, their direct mixing leads to incompatible blends with poor properties. Polypropylene functionalized with glycidyl methacrylate (PP‐GMA) was used as a compatibilizer in blends of PP and nylon 6, because of the possible reaction of ? NH₂ and ? COOH groups with the epoxide group of GMA. Two types of nylon 6 with different ratios between ? NH₂ and ? COOH groups were used. The one with higher concentration of ? COOH groups was less compatible with PP in a binary blend. When PP‐GMA was used as a compatibilizer, a better dispersion of nylon in the PP matrix was obtained together with better mechanical properties for both nylons used in this work. © 2001 Society of Chemical Industry     

PP-g-MAH和PP-g-GMA增容PP/PA6共混体系的研究

将自制的PP—g—MAH（聚丙烯接枝马来酸酐）及PP—g—GMA（聚丙烯接枝甲基丙烯酸缩水甘油酯）作为PP／PA6共混体系的相容剂，研究了加入聚丙烯接枝物后PP，PA6塑料合金的各种力学性能及形态结构。结果表明：在PP／PA6共混物中加入PP—g—MAH后，共混物的力学性能得到明显的提高．添加PP—g—MAH对不同比例PP／PA6共混物力学性能的影响不同；用PP—g—MAH和PP—g—GMA两种接枝物共同作为相容剂加入到PP／PA6共混物中比单独使用一种的效果要好。共混物的SEM照片表明。PP—g—MAH是PP／PA6共混物的有效增容剂。     

Effects of compatibilization of oxidized polypropylene on PP blends of PP/PA6 and PP/talc

The influence of compatibilization on the dynamic mechanical properties of polypropylene (PP) binary blends with polyamide‐6 (PA6), Talc, and oxidized PP (OPP) was investigated. The oxidation of PP homopolymer was performed in a internal mixer by using air as a oxidizing agent (under atmospheric pressure) and dodecanol‐1 as an accelerator at 180°C for 6½ h [Abdouss, M.; Sharifi‐Sanjani, N.; Bataille, P. J Appl Polym Sci 1999, 36, 10]. In the blends, OPP was used as a blend component and compared with PP over the whole concentration range. Pressed film blends of PP/OPP, PP/OPP/Talc, and PP/OPP/PA6 were examined by dynamic mechanical analyzer, thermal gravimetry analysis, and scanning electron microscopy. Mechanical properties such as tensile strength, modulus of elasticity, elongation, melt flow index, and hardness of the blends were measured. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2871–2883, 2004     

聚丙烯接枝物的制备及其在PP/PA6共混体系中的应用

以BPO为引发剂,通过悬浮固相接枝法,得到PP-g-（MAH/VAc）和PP-g-（MA/AA）接枝物,通过称重法和非水滴定法测得了接枝物的接枝率。红外光谱表明,单体都能接枝到PP上。SEM结果表明PP/PA6/PP接枝物共混体系中,PP-g-（MAH/VAc）的增容效果优于PP-g-（MA/AA）,这主要是因为PP-g（MAH/VAc）在PP/PA6体系中起到反应性增容的作用,而PP-g-（MA/AA）仅起到物理缠结的作用。     

聚丙烯熔融接枝马来酸二丁酯增容聚丙烯／尼龙6的研究

研究了聚丙烯（ＰＰ）与马来酸二丁酯（ＤＢＭ）的接枝共聚物ＰＰｇＤＢＭ对聚丙烯／尼龙６（ＰＰ／ＰＡ６）共混物的增容作用。研究表明,ＰＰｇＤＢＭ是ＰＰ／ＰＡ６共混体系的有效增容剂,由于共混过程中就地生成ＰＰｇＰＡ６,改善了共混物的相容性,增加了两相界面的粘合,使分散相粒径减小,分散更均匀,提高了共混物的力学性能。增容剂接枝率的高低对增容效果有一定影响,接枝物中残留单体不影响增容效果     

衣康酸接枝PP增容PA6／PP合金的研究

以马来酸酐接枝ＰＰ（ＭＰＰ）作对照,研究了衣康酸接枝ＰＰ（ＩＰＰ）的熔体流动速率（ＭＦＲ）、接枝率（ＧＲ）妆枝配方的关系,ＰＡ６／接枝ＰＰ／ＰＰ合金的力学性能与接枝ＰＰ的特征参数、用量和合金组成比的关系。结果表明,ＩＰＰ对ＰＡ６／ＰＰ的增容效率明显高于ＭＰＰ,并具有显著提高材料冲击韧性的作用,可作为ＰＡ／ＰＰ高效增容剂兼增韧剂应用。     

马来酸接枝PP增容PA6/PP合金的研究

研究了马来酸接枝聚丙烯(MAC-g-PP)的熔体流动速率(MFR)、接枝率与接枝配方的关系,PA6/接枝PP/PP合金的力学性能与接枝PP的特征参数、用量,以及PA6/(PP 接枝PP)配比的关系。结果表明,合金的力学性能随接枝PP的MFR增加而提高,与接枝率无关,接枝PP用量有一最佳值,高MFR的MAC-g-PP能显著改善合金的冲击韧性。     

共混工艺对PP/PA6/纳米SiO2复合材料力学性能的影响

以聚丙烯（PP）作为基体,经表面处理过的纳米二氧化硅（nano-SiO2）和刚性聚合物尼龙6（PA6）作为改性剂,添加5％的接枝POE作增容剂,采用不同的共混工艺制备PP／PA6／纳米SiO2复合材料。研究了熔融共混挤出次数和共混方法对PP／PA6／纳米SiO2复合材料力学性能的影响,借助扫描电子显微镜从断面形貌上分析了影响复合材料力学性能的因素。结果表明：采用二次挤出熔融共混比一次挤出熔融共混制得的复合材料力学性能要好;采用PP与纳米SiO2先熔融共混挤出制得粒料,再用PA6、接枝POE与粒料熔融共混挤出的共混方法制得的复合材料综合力学性能最优。     

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。     

PP/PA6共混比例对其水辅助注塑管件性能及微观形态的影响

以聚丙烯 (PP)为基材,聚酰胺6(PA6)为分散相,制备了4种共混比例的PP/PA6复合材料,考察了共混比例对其水辅助注射成型技术（WAIM）管件拉伸强度及微观形态的影响。结果表明,试样拉伸强度随PA6含量增加先减小后增大;近模壁层和近水层的PA6分散相为大长厚比的长条状或长片状,中间层分散相为椭球状,且随PA6含量增加各层分散相有聚集长大的趋势;管件近模壁层和近水层的晶粒小而密且沿流动方向排列,而中间层晶粒相对更粗大;PP只形成了一种晶型,PA6形成了2种晶型;近水层和近模壁层PP结晶度高于中间层;PA6随其含量增加其结晶度有增大的趋势,且近模壁层结晶度较高。     

PP—g —HMA增容尼龙6／聚丙烯共混物结构与性能研究

采用固相力化学方法制备的聚丙烯接枝羟甲基丙烯酰胺作增容剂,制备了尼龙6／聚丙烯共混物,通过SEM、DSC、流变性能测试和力学性能测试研究了共混物的结构、流变性能和力学性能。 结果表明,当尼龙6体积分数为80％时,增容共混体系中冲击强度出现峰值,达到77J／m,分散相尺寸变小,增容共混体系熔融粘度增加。通过Molau实验和FT－IR分析对增容机理作了初步探讨。     

新型聚丙烯固相接枝物增容聚丙烯／尼龙6共混物的研究

研究了聚丙烯与马来酸酐,甲基丙烯酸甲酯及第三单体的固相接枝共聚物「ＰＰ－ｇ（ＭＡＨ－ＭＭＡ－ＴＭ）」对聚丙烯／尼龙６（ＰＰ／ＰＡ６）共混物的增容作用。结果表明,新表明ＰＰ固相接枝物能有效地改善ＰＰ／ＰＡ６共混物的相容性,增加两相界面的粘合作用,显著提高共混物的力学性能,增容后体系假塑性增加,熔体粘度上升,活化能增加。     

PP-g-MAH增容PP/PA66共混物的形态结构和性能

用固相接技法制备了马来酸酐接枝改性聚丙烯(PP-g-MAH),研究了PP-g-MAH增容PP/PA66共混物的形态结构和性能。结果表明,未用PP-g-MAH增容的PP/PA66共混物是热力学不相容的海岛型两相结构,而用PP-g-MAH增客的PP/PA66共混物虽是两相结构,但分散相粒子尺寸大大减小,PP-g-MAH对PP/PA66共混物实现了反应性增容。与不含PP-g-MAH的PP/PA66共混物相比,PP-g-MAH增容的PP/PA66共混物的拉伸强度提高约10 MPa,弯曲强度提高约10 MPa,弯曲模量增加10％,缺口冲击强度和伸长率保持不变。     

低分子量马来酸酐化聚丁二烯橡胶改性聚丙烯增韧尼龙6的性能

采用模量和强度更高的PP代替LDPE为核,在PP上接枝不同含量的PB-g-MAH(MLPB),在反应挤出过程中与PA6中形成了新型的核/壳(PP/PB-g-MAH)橡胶增韧体系。结果表明:硬核/软壳的增韧体系(PP/PA6)是一种十分有效的方式,能使共混物获得更好的缺口冲击强度、拉伸屈服强度和弹性模量之间的平衡。当PB-g-MAH含量为5%时,增韧体系缺口冲击强度可达480 J/m,而模量和屈服强度分别为2.13 GPa和54 MPa,相对纯尼龙6只有15%和13%的模量和屈服强度损失。     

马来酸酐接枝物对PE/PA6共混物相容性的影响

采用熔融共混法制备了PP/PA6/POE-g-MAH和PP/PA6/PP-g-MAH共混物。通过扫描电子显微镜(SEM)、差示扫描量热(DSC)仪分析和力学性能测试研究了增容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和宏观力学性能的影响。结果表明,在PP/PA6共混体系中分别加入POE-g-MAH和PP-g-MAH不仅能显著改善两相界面的相容性,减小分散相的粒径,而且能使共混物的力学性能显著提高。当增容剂的用量为5份时,PP/PA6共混物有较好的综合力学性能。POE-g-MAH和PP-g-MAH增容PP/PA6共混体系非等温结晶行为的研究表明,POE-g-MAH和PP-g-MAH均能促进PA6对PP基体的异相成核作用。     

PP/EVOH/PA6共混物的性能研究

以聚丙烯接枝马来酸酐(PP-g-MAH)为相容剂,制备了聚丙烯(PP)/乙烯-乙烯醇共聚物(EVOH/)聚酰胺6(PA6)共混物,研究了PP/EVOH/PA6三元共混物的相容性、流变性能、阻隔性能、力学性能、热性能及形态结构。结果表明:相容剂与EVOH和PA6间发生了反应,提高了共混物的相容性;相容剂的加入提高了PP、EVOH、PA6的结晶温度,增强了PP与EVOH和PA6间的黏合力,降低了界面张力;EVOH占EVOH/PA6总量68%的三元共混物吸油率最小,当相容剂用量为5份时,PP/EVOH/PA6三元共混物吸油率比PP/EVOH二元共混物降低了8%。     

Reactive compatibilization of PA6/LDPE blends with an ethylene-acrylic acid copolymer and a low molar mass bis-oxazoline

A sample of polyamide-6 (PA) was blended with low density polyethylene (LDPE) in the 80/20 wt/wt ratio, either without and with 2 phr of an ethylene-acrylic acid copolymer (EAA), Which was known to behave as a compatibilizer precursor, and the effect of the addition of small amounts (0.2 or 0.35 phr) of a fourth component, 2,2′-(1,3-phenylene)-bis(2-oxazoline) (PBO), was investigated. The reactions of PBO with EAA, PA and their blends were studied by recording as a function of time the torque applied to the blending apparatuses and by studying the solubility behavior of the products in formic acid. The PALDPE blends were prepared in a co-rotating twin screw extruder and were characterized by Molau tests, differential scanning calorimetry, scanning electron microscopy, rheology, and determination of the ultimate mechanical properties, including impact tests. The results indicate that the effectiveness of EAA as a compatibilizer precursor is considerably enhanced when PBO is added into the blends. It is thought that the reactions of PBO with the free carboxyl groups of EAA and with the amine or carboxyl end groups of PA run, at least in part, toward the formation of PA-g-EAA copolymers acting as the true compatibilizers for these blends.     

Improvement of mechanical properties for PP/PS blends by in situ compatibilization

The effect of the in situ compatibilization on the mechanical properties of PP/PS blends was investigated. The application of Friedel-Crafts alkylation reaction to the PP/PS-blend compatibilization was assessed. Styrene/AlCl₃ was used as catalyst system. The graft copolymer (PP-g-PS) formed at the interphase showed relatively high emulsifying strength. Scission reactions, occurring in parallel with grafting, were verified for PP and PS at high catalyst concentration, but no crosslinking reactions were detected. Tensile tests were performed on dog-bone specimens of the blends. Both elongation at break and toughness increased with catalyst concentration. At 0.7% AlCl₃, a maximum was reached, which amounted to five times the value of the property for the uncompatibilized blend. At higher catalyst concentrations these properties decreased along with the PP molecular weight due to chain-scission reactions. On the other hand, the tensile strength did not change with the catalyst concentration. The in situ compatibilized blends showed considerable improvement in mechanical properties, but were adversely affected by chain scissions at high catalyst contents.