PA610/PC合金的制备及其力学性能研究

分别选用环氧树脂(EP)及(乙烯/马来酸酐/甲基丙烯酸缩水甘油酯)三元共聚物(EMG)为增容剂,采用熔融挤出法制备了PA610/PC/EP合金和PA610/PC/EMG合金,并研究了这两种合金的力学性能。结果表明,在保持合金其它力学性能基本不变的情况下,当PA610/PC/EP的质量比为75/25/2时,合金的缺口冲击强度比未加入EP时提高了83.7%,比纯PA610提高了84.1%;而且在PA610/PC(75/25)体系中加入EMG增容时,合金的缺口冲击强度也随其含量的增加而明显提高;在加入9份EMC的PA610/PC/EMG体系中再加入2份EP协同增容时,合金的缺口冲击强度比未增容时提高了142.0%。     

尼龙612/EP/SEBS-g-MAH/PC共混合金的制备及性能研究

采用熔融挤出法制备了尼龙612/环氧树脂(EP)/苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚弹性体与马来酸酐接枝共聚物(SEBS-g-MAH)/聚碳酸酯(PC)共混合金,并研究了合金的力学性能及微观形态.结果表明:尼龙612/EP/SEBS-g-MAH/PC合金各组分质量比为75/2/9/25时,合金的冲击强度比纯尼龙612提高丁278.7%,断裂伸长率提高116%.微观结构形态研究表明:合金分散相的尺寸减小、分布更加均匀.     

PPS/SEBS-g-MAH/PA46合金的制备及性能研究

通过合金化增韧改性PPS。在聚苯硫醚(PPS)中加入聚酰胺(PA46)和增容剂苯乙烯-乙烯-丁二烯-苯乙烯接枝马来酸酐(SEBS-g-MAH),通过熔融共混制备了PPS/SEBS-g-MAH/PA46合金;进一步使用二苯基甲烷二异氰酸酯(MDI)对PPS树脂进行活化处理,之后同样制备了活化PPS/SEBS-g-MAH/PA46合金。测试了合金的力学性能和热性能,并用扫描电镜观察了合金的微观结构形态。结果表明,加入增容剂后,合金的冲击强度有所提高;PPS树脂经过MDI活化后,合金的性能显著提高;当活化PPS/PA46质量比为70/30、SEBS-g-MAH质量分数为9%时,能制备出综合性能优良的合金材料,其冲击强度为8.4 kJ/m2,拉伸强度为61.2 MPa,弯曲强度为81.5 MPa,热变形温度为117℃。     

(PA1010/66)/SEBS-g-MAH/DIDP/BSBA共混物的制备与性能研究

将尼龙(PA)1010盐和PA66盐按照质量比为9∶1的比例制备了PA1010/66共聚物。选择(苯乙烯/乙烯-丁烯/苯乙烯)共聚物接枝马来酸酐(SEBS-g-MAH)和两种小分子增塑剂邻苯二甲酸二异癸酯、N-丁基苯磺酰胺(D IDP、BSBA),采用共混挤出法制备了(PA1010/66)/SEBS-g-MAH/D IDP/BSBA共混物,并对其力学性能进行了研究。结果表明,随着SEBS-g-MAH含量的增加,共混物的冲击强度明显提高。当SEBS-g-MAH质量分数为15%时,其缺口冲击强度为72.7 kJ/m2,是PA1010/66共聚物的16倍左右;拉伸强度保持率是PA1010/66共聚物的83%左右。通过SEM研究发现,SEBS-g-MAH对PA1010/66共聚物的增韧机理为银纹剪切带增韧机理。     

PA6/ABS合金的增韧改性研究

采用马来酸酐接枝丙烯腈-丁二烯-苯乙烯共聚物(ABS-g-MAH)、马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)和苯乙烯-马来酸酐共聚物(SMA)为相容剂,研究了相容剂种类、相容剂含量、增韧剂含量及挤出机螺杆转速对尼龙6/丙烯腈-丁二烯-苯乙烯共聚物(PA6/ABS)合金力学性能的影响。研究表明,ABS-g-MAH为PA6/ABS合金的最佳相容剂,且质量分数为20%时合金的缺口冲击强度最高;采用ABS-g-MAH和POE-g-MAH复合增容增韧可得到力学性能优越的PA6/ABS合金;降低挤出机螺杆转速可使PA6/ABS合金的缺口冲击强度提高。     

相容剂SMA对PPO/PA66/SEBS-g-MAH合金力学性能的影响及其机理

采用马来酸酐-苯乙烯共聚(SMA)提高PPO/PA66/SEBS-g-MAH合金中PPO和PA66的相容性,研究SMA含量对3种PPO/PA66/SEBS-g-MAH合金拉伸强度、冲击强度和弯曲强度等力学性能的影响.结果表明,当SMA添加量为1～3份时,PPO/PA66/SEBS-g-MAH合金的拉伸强度、弯曲强度和冲...     

SEBS和SEBS-g-MAH对PPO/PA66合金性能影响的研究

在双螺杆挤出机上采用共混挤出的方法制备了苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)和马来酸酐接枝苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS-g-MAH)增韧的聚苯醚(PPO)/聚酰胺66(PA66)合金。通过力学性能测试、扫描电子显微镜观察和吸水性实验,研究了SEBS和SEBS-g-MAH及其含量对PPO/PA66合金性能的影响。结果表明,SEBS-g-MAH增韧PPO/PA66合金体系的力学性能较好,吸水率较小。     

PTW和EP复合增容PBT/PA610合金的研究

选用PTW和环氧树脂（EP）为复合增容剂,采用熔融挤出法制备了聚对苯二甲酸丁二酯（PBT）／尼龙610（PA610）合金,研究了合金的力学性能和熔融结晶行为。结果表明,当PBT、PA610、PTW、EP的质量比为70／30／17／3时,合金的缺口冲击强度比PBT提高了344．8％;增容剂的加入使合金中PBT的结晶温度升高、结晶速率增大,但使合金的结晶度有所降低。     

一种新型相容剂对PA/ABS合金力学性能的影响

通过自制丙烯腈-丁二烯-苯乙烯共聚物(ABS)与乙烯-丙烯酸甲酯共聚物(EMA)双组份接枝马来酸酐的新型相容剂(ABS/EMA-g-MAH),并与国内外相容剂马来酸酐接枝丙烯腈-丁二烯-苯乙烯(ABS-g-MAH)、苯乙烯-马来酸酐共聚物(SMA)进行比较,研究了相容剂种类、相容剂含量及挤出机螺杆转速对尼龙/丙烯腈-丁二烯-苯乙烯共聚物(PA/ABS)合金力学性能的影响。研究表明,ABS/EMA-g-MAH为PA/ABS合金的最佳相容剂;在添加量为12%时ABS/EMA--g-MAH表现出最佳的增容增韧效果;降低挤出机螺杆转速可使PA6/ABS合金的缺口冲击强度提高。     

CPPS/PA1010/EMG合金的制备与性能表征

采用(乙烯/马来酸酐/甲基丙烯酸缩水甘油酯)三元共聚物(EMG)为增容剂,与PA1010和化学处理的PPS(CPPS)熔融共混制备了CPPS/PA1010/EMG合金。当EMG含量为9份时,制备的高刚性、高韧性合金在保持其它力学性能基本不变的情况下其冲击强度提高了4.5倍;并研究了该合金的熔融结晶行为和热降解行为。     

SEBS-g-MAH和EP复合增容PA610/PC合金的研究

选用SEBS-g-MAH和EP为复合增容剂,采用熔融挤出的方法制备了PA610/PC合金,研究了该合金的力学性能、熔融结晶及微观结构形态。结果表明,当PA610/SEBS-g-MAH(EP)/PC组分比为75/9(2)/25时,合金的冲击强度比不加增容剂时提高了281.4%,断裂伸长率提高了346.0%。而增容剂的加入使合金中PA610的结晶温度升高,结晶速率增大而结晶度降低,由于异相成核作用使结晶发生细化,使得韧性提高、熔点降低。微观结构形态研究表明,在只加入SEBS-g-MAH的PA610/PC合金中,合金断面有很多PC被拔出及余留空洞的现象;在加入EP协同增容后,PC被拔出的现象减少,与PA610基体的界面粘合增强,空洞消失。     

Special effect of epoxy resin E-44 on compatibility and mechanical properties of poly(butylene terephthalate)/polyamide-6 blends

An attempt was made to modify the properties of poly(butylene terephthalate) (PBT) by blending it with polyamide-6 (PA-6). Since PBT and PA-6 are incompatible, epoxy resin was used as a compatibilizer to form an alloy. Alloys of PBT and PA-6 with varying amounts (0–12%) of epoxy resin E-44 were prepared by melt blending. The notched Izod impact strength and flexural strength as a function of epoxy resin E-44 content were studied. Ultimate mechanical properties showed significant improvement on addition of epoxy resin E-44. The maximum increase of the notched Izod impact strength (≈600%) of PBT/PA-6 blends is obtained at 3% (weight) epoxy resin E-44 content. The impact fracture surfaces were studied using scanning electron microscopy (SEM): The SEM micrographs showed a noticeable change in the type of surface structure on adding epoxy resin E-44. DMTA also showed improved compatibility between PBT and PA-6 on adding epoxy resin E-44. DSC studies showed that the presence of epoxy resin E-44 hindered the crystallization of both PBT and PA-6 in the alloys. Wide-angle X-ray diffraction (WAXD) showed no obvious difference on crystallinity of PBT and PA-6 in the alloys with the presence of a small amount of epoxy resin E-44. © 1996 John Wiley & Sons, Inc.     

环氧官能化(乙烯/辛烯)共聚物增韧PBT的研究

利用双螺杆挤出机将对苯二甲酸丁二酯(PBT)分别与(乙烯／辛烯)共聚物(POE)及环氧官能化的POE(gPOE)熔融共混,对共混物的流变性能、相形态、断裂形貌和力学性能进行了研究。结果表明,gPOE的环氧官能团与PBT的端羧基或端羟基发生化学反应生成PBT—CO—POE共聚物,降低了PBT与POE之间的界面张力,使POE在PBT基体中分散均匀;与PBT／POE共混物相比,PBT／gPOE共混物呈现明显的韧性断裂特征;gPOE的引入显著提高了PBT的缺口冲击强度,成功实现了对PBT的增韧。     

Characterization and Properties of Reactive Poly(lactic acid)/Polyamide 610 Biomass Blends

A low molecular weight bisphenol‐A type epoxy resin was used as a reactive compatibilizer for poly(lactic acid) (PLA)/polyamide 610 (PA 610) biomass blends. To the best of our knowledge, this blend is the first biomass PA 610 blend in the literature. The epoxy functional groups could react with the terminal groups of both PLA and PA 610. An ester–amide interchange reaction led to a polyester–polyamide copolymer formation, and improved the compatibility of PLA and PA 610. The blends with epoxy resin showed an enhancement in the phase dispersion and interfacial adhesion compared with the blend without epoxy resin. The differential scanning calorimetry (DSC) analysis showed that the crystallization peak temperatures decreased with increasing epoxy content. The melting temperature of PA 610 decreased with the addition of PLA, but remained unchanged with increased compatibilizer dosages. The dynamic mechanical analysis (DMA) showed that the glass transition temperature (T_g) of the blend, with the addition of 0.5 phr epoxy resin, slightly increased compared with that of neat PLA. However, the T_g of the blends remained unchanged with increasing epoxy resin content, and the higher content of epoxy resin in the blends resulted in improved mechanical properties and higher melt viscosity. The unnotched impact test showed that PA 610 could toughen PLA with the addition of epoxy resin. Moreover, the no‐break unnotched impact behavior was observed with the medium content of the compatibilizer, improving the notch sensitivity of PLA. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2563–2571, 2013     

PA6/PBT合金的制备与性能

将乙烯–辛烯共聚物接枝马来酸酐(POE-g-MAH)和乙烯–辛烯共聚物接枝甲基丙烯酸缩水甘油酯(POEg-GMA)复配作为增容剂,采用熔融共混的方法制备尼龙(PA)6/聚对苯二甲酸丁二酯(PBT)合金。通过扫描电子显微镜、力学性能和吸湿性研究了PA6/PBT配比和增容剂用量对合金性能的影响。研究表明,增容剂的加入能改善PA6/PBT合金的相容性,PBT和增容剂的加入能有效地抑制PA6的吸水率。添加15份增容剂可使合金的缺口冲击强度达到15.5 k J/m~2,相比未加入增容剂提高385.9%。     

Thermal and mechanical properties of poly(butylene terephthalate)/epoxy blends

In this study, melt blends of poly(butylene terephthalate) (PBT) with epoxy resin were characterized by dynamic mechanical analysis, differential scanning calorimetry, tensile testing, Fourier transform infrared spectroscopy, and wide‐angle X‐ray diffraction. The results indicate that the presence of epoxy resin influenced either the mechanical properties of the PBT/epoxy blends or the crystallization of PBT. The epoxy resin was completely miscible with the PBT matrix. This was beneficial to the improvement of the impact performance of the PBT/epoxy blends. The modification of the PBT/epoxy blends were achieved at epoxy resin contents from 1 to 7%. The maximum increase of the notched Izod impact strength (≈ 20%) of the PBT/epoxy blends was obtained at 1 wt % epoxy resin content. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Morphology and properties of PBT/nylon 6/EVA‐g‐MAH ternary blends prepared by reactive extrusion

Morphology and properties of poly(butylene terephthalate) (PBT)/nylon 6 (PA6)/EVA‐g‐MAH ternary blends were investigated. The blends were prepared in a corotating, intermeshing, twin‐screw extruder. The incorporation of maleic anhyride (MAH) grafted onto ethylene‐vinyl acetate copolymer (EVA) (EVA‐g‐MAH) in the PBT/PA6 binary blends decreased the tensile and flexural strength but increased the impact strength, while the mechanical properties of the PBT/PA6 blends were decreased with increasing PA6 content regardless of the presence or absence of the EVA‐g‐MAH. The morphology studies of the ternary blends showed gross phase separation. The rheological properties of the ternary blends suggested that excessively high reactivity between amine end groups of PA6 and MAH grafted onto EVA makes the compatibility between PBT and PA6 worse, although EVA‐g‐MAH was expected to work as a compatibilizer for PBT/PA6 blends. The degree of reactivity between functional groups in PBT, PA6, and EVA‐g‐MAH was also examined by investigating the effect of blending sequence on the properties of the ternary blends.     

Functionalized elastomeric compatibilizer in PA 6/PP blends and binary interactions between compatibilizer and polymer

Superior impact properties were obtained when maleic anhydride grafted styrene ethylene/butylene styrene block copolymer (SEBS-g-MAH) was used as a compatibilizer in blends of polyamide 6 (PA 6) and isotactic polypropylene (PP), where polyamide was the majority phase and polypropylene the minority phase. The optimum impact properties were achieved when the weight relation PA:PP was 80:20 and 10 wt% SEBS-g-MAH was added. The blend morphology was systematically investigated. Transmission electron microscopy (TEM) indicated that the compatibilizer forms a cellular structure in the PA phase in addition to acting as an interfacial agent between the two polymer phases. In this cellular-like morphology the compatibilizer appears to form the continuous phase, while polyamide and polypropylene form separate dispersions. In microscopy, PA appeared as a fine dispersion and PP as a coarse dispersion. The mechanical properties indicated that in fact PA, too, is continuous, and the blend can be interpreted as possessing a modified semi-interpenetrating network (IPN) structure with separate secondary dispersion of PP. The coarser PP dispersion plays an essential role in impact modification. Binary blends of the compatibilizer and one blend component were also investigated separately. The same cellular structure was observed in the binary PA/SEBS-g-MAH blends, and SEBS-g-MAH again appeared to form the continuous phase when the elastomer concentration was at least 10 to 20 wt%. By contrast, in PP/SEBS-g-MAH only conventional dispersion of elastomeric SEBS-g-MAH was observed up to 40 wt% elastomer. Impact strength was improved and the elastic modulus was lowered in both PA/SEBS-g-MAH and PP/SEBS-g-MAH blends when the elastomer content was increased. The changes in modulus indicate that the semi-IPN-like structure is formed in the binary PA/SEBS-g-MAH blends as well as in the ternary structure.