HDPE-g-MAH对HDPE/PA 11性能的影响

以马来酸酐(MAH)接枝高密度聚乙烯(HDPE)(HDPE-g-MAH)作为相容剂,通过熔融共混法制备了HDPE/聚酰胺11(PA 11)共混物.研究了HDPE-g-MAH对HDPE/PA 11共混物的增容作用以及对共混物性能的影响.结果表明,HDPE-g-MAH对共混体系有明显的增容作用,共混物的拉伸强度和冲击强度得到提高;相容剂的加入,使共混物的结晶温度升高.     

相容剂对HDPE/PA6共混体系性能的影响

采用双螺杆挤出机,制备了乙烯-辛烯共聚物接枝马来酸酐(POE-g-MAH)以及高密度聚乙烯接枝马来酸酐(HDPE-g-MAH)2种增容剂改性的高密度聚乙烯(HDPE)/尼龙(PA6)共混物,研究了不同增容剂对共混物力学性能、耐温性能的影响。采用扫描电镜对共混物的冲击断面进行观察分析。结果表明:相容剂POE-g-MAH的增容效果优于HDPE-g-MAH。PA6添加量为15%时,相容剂HDPE-g-MAH的耐热改性效果优于POE-g-MAH,比纯HDPE的维卡软化点提高了5.8℃,共混物的断裂伸长率为35.0%,降低了1%,拉伸强度为22 MPa,提高了1 MPa,冲击强度为70.6 k J/m2;相容剂为POE-g-MAH时,共混物的断裂伸长率为60.2%,降低了8.4%,共混物的拉伸强度为18.9 MPa,提高了0.4 Mpa,冲击强度为86.7 k J/m2。     

NBR改性HDPE共混物的力学性能和相态结构研究

通过熔融共混法制备了两种AN的NBR改性HDPE的共混物,研究了其力学性能和相态结构。结果表明：HDPE和不同AN的NBR共混,改性效果不同：共混物中NBR的含量不同,改性效果不同。HDPE和NBR－18（NBR含量为15％）共混改性效果最好,冲击强度提高4．4倍,相态结果为平行排列的丝状。     

HDPE/NBR共混物的结构与性能研究 Ⅰ.共混物的物理力学性能

通过使HDPE与NBR熔融共混,研究了HDPE/NBR共混物的物理力学性能。结果表明,加入少量例如5%的NBR,能使HDPE的冲击强度由288J/m增加到823J/m,提高近2倍;耐环境应力开裂性出52小时增加到280小时,提高近5倍;断裂伸长率达到900%;同时伴随屈服强度的下降。NBR的用量大于20%时,共混物的力学性能变差。SEM显示少量的NBR能引发大量的银纹,而使HDPE的冲击韧性明显提高。     

相容剂对HDPE/PC共混合金性能的影响

采用熔融接枝方法制备马来酸酐接枝高密度聚乙烯(HDPE-g-MAH)和丙烯酸接枝高密度聚乙烯(HDPE-g-AA)，比较了这2种相容剂对HDPE／聚碳酸酯(Pc)共混合金体系的增容效果，着重研究了接枝单体、引发剂对HDPE接枝物的接枝率和熔体流动速率的影响及HDPE接枝物用量对HDPE／PC合金力学性能的影响。结果表明：HDPE-g-MAH相容剂的增容效果较好。用量为15份时使HDPE／PC合金缺口冲击强度提高了30％。     

PBT/HDPE和PBT/HDPE-g-MAH共混体系形态和性能研究

通过熔融共混制备了聚对苯二甲酸丁二酯／马来酸酐接枝高密度聚乙烯(PBT／HDPE-g-MAH)和PBT／HDPE共混物,研究了共混体系的力学性能、相形态、熔融结晶行为和加工性能。结果表明,单纯加入HDPE对PBT的增韧效果并不理想,而加入HDPE-g-MAH可以提高PBT的冲击强度;HDPE-g-MAH可以改善共混体系的相形态,提高共混体系的相容性,有利于共混物性能的提高。     

HDPE/TPU共混物的制备及性能

通过熔融共混方法,制备了高密度聚乙烯/热塑性聚氨酯弹性体(HDPE/TPU)共混物。使用电子万能试验机、冲击试验机和扫描电镜研究了共混物的力学性能与冲击断面的微观形貌;采用90#无铅汽油为介质研究了共混物的耐油性。力学性能测试表明,共混配比和相容剂的加入量对HDPE/TPU共混物的力学性能影响较大,当HDPE∶TPU为90∶10,相容剂LDPE-g-MAH和填料轻质碳酸钙的加入量分别为10%和20%时,共混物的拉伸强度、断裂伸长率、冲击强度比纯聚乙烯分别提高了70%、50%和35%;扫描电镜测试表明,相容剂可以有效改善HDPE与TPU的界面作用,提高二者的相容性;耐油性实验表明,当HDPE∶TPU∶LDPE-g-MAH=90∶10∶10,轻质Ca CO3用量为20%～30%时,共混物的耐油性最佳。     

聚丙烯/冷冻胶粉复合材料结构与性能的研究

采用熔融挤出的方法制备聚丙烯（PP）、冷冻胶粉（LGTR）、相容剂及增韧剂的共混物,研究了胶粉用量、相容剂种类和用量及增韧剂对共混体系力学性能和微观结构的影响。结果表明,LGTR的加入会降低PP的力学性能,但随着LGTR用量的增加,共混体系的冲击强度上升;相容剂的使用会增加PP与LGTR的相容性,使力学性能提高;热塑性聚烯烃类弹性体（POE）和三元乙丙胶接枝马来酸酐（EPDM-g-MAH）的使用可以有效提高PP/胶粉共混体系的缺口冲击强度,并且增韧剂的使用可以提高PP与LGTR之间的相容性;高密度聚乙烯（PE-HD）/POE并用做增韧体系时,可以进一步提升共混体系的韧性,提高冲击强度。     

相容剂作用下超高相对分子质量聚乙烯增韧聚丙烯共混体系的研究

选取不同相容剂[马来酸酐接枝聚丙烯、线形低密度聚乙烯、丙烯腈-丁二烯-苯乙烯共聚物（ABS）]增容聚丙烯/超高相对分子质量聚乙烯（PP/PE-UHMW）共混体系,对比不同相容剂作用下PP/PE-UHMW共混体系力学性能的差异,并研究了PP/PE-UHMW/相容剂共混体系的亚微相结构,进一步探讨了微观结构对PP/PE-UHMW共混体系力学性能的影响。结果表明,添加相容剂的三元共混体系的结晶颗粒呈细化趋势;相容剂ABS的增容效果较好,PP/PE-UHMW/ABS共混体系的冲击强度最高可达113.31 J/m,并可保持PP原有的拉伸强度,但其断裂伸长率有较大幅度的降低。     

回收高密度聚乙烯/沙粉共混体系力学性能研究

探讨了沙粉和回收高密度聚乙烯(RHDPE)共混改性时,沙粉用量、相容剂用量及种类对RHDPE/沙粉共混体系力学性能的影响.实验结果表明,当沙粉的质量分数为60%～80%时,体系的综合力学性能最佳.在RHDPE/沙粉体系中添加6%的相容剂HDPE-g-MAH能有效地提高体系的拉伸强度和冲击强度,而对共混物的弯曲强度影响不大.     

Mechanical behaviors of ethylene/styrene interpolymer compatibilized polystyrene/polyethylene blends

In this study, ethylene/styrene interpolymer was used as a compatibilizer for the blends of polystyrene (PS) and high‐density polyethylene (HDPE). The mechanical properties including tensile and impact properties and morphology of the blends were investigated by means of uniaxial tension, instrumented falling‐weight impact measurements, and scanning electron microscopy. Tensile tests showed that the yield strength of the PS/HDPE/ESI blends decreases considerably with increasing HDPE content. However, the elongation at break of the blends tended to increase significantly with increasing HDPE content. The excellent tensile ductility of the HDPE‐rich blends resulted from shield yielding of the matrix. Izod and Charpy impact measurements indicated that the impact strength of the blends increases slowly with HDPE content up to 40 wt %; thereafter, it increases sharply with increasing HDPE content. The impact energy of the HDPE‐rich blends exceeded that of pure HDPE, implying that the HDPE polymer can be further toughened by the incorporation of brittle PS minor phase in the presence of ESI compatibilizer. The correlation between the impact property and morphology of the blends is discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 4001–4007, 2007     

Compatibilizers for recycling of the plastic mixture wastes. II. The effect of a compatibilizer for binary blends on the properties of ternary blends

In this article, we discuss the effect of a compatibilizer for binary blends on the properties of ternary blends composed of high‐density polyethylene (HDPE), polypropylene (PP), or polystyrene (PS) and poly(vinyl chloride) (PVC) virgin polymers with a simulated waste plastics fraction. Chlorinated polyethylene (CPE), ethylene–propylene rubber (EPR), and their 1/1 (w/w) mixture were tested as compatibilizers for the HDPE/PP/PVC ternary blend. CPE, styrene‐ethylene‐propylene block copolymer (SEP), or their 1/1 (w/w) mixture were tested as compatibilizers for the HDPE/PS/PVC ternary blend. The composition of the ternary blends were fixed at 8/1/1 by weight ratio. The amount of the compatibilizer was 3 phr. Rheological, mechanical, and thermal properties were measured. For the 8/1/1 HDPE/PP/PVC ternary blends, the tensile strength was slightly decreased, but the impact strength was significantly increased by adding EPR, CPE, or their mixture. EPR exhibited the most significant impact modification effect for the ternary blends. In a similar way, for 8/1/1 HDPE/PS/PVC ternary blends, on adding SEP, CPE, or their mixture, the tensile strength was slightly decreased, but the impact strength was noticeably increased. It was found that the SEP worked much better as an impact modifier for the ternary blends than CPE or the SEP/CPE mixture did. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1048–1053, 2000     

Impact and tensile properties of SEBS copolymer compatibilized PS/HDPE blends

In this study, polystyrene–hydrogenated polybutadiene–polystyrene (SEBS) triblock copolymer was used as a compatibilizer for the blends of polystyrene (PS) and high-density polyethylene (HDPE). The morphology and static mechanical and impact properties of the blends were investigated by means of scanning electron microscopy, uniaxial tension, and instrumented falling-weight impact measurements. Tensile tests showed that the yield strength of the PS/HDPE/SEBS blends decreases considerably with increasing HDPE content. However, the elongation at break of the blends tended to increase significantly with increasing HDPE content. The excellent tensile ductility of the HDPE-rich blends resulted from shield yielding of the matrix. Charpy impact measurements indicated that the impact strength of the blends increases slowly with HDPE content up to 50 wt %; thereafter, it increases sharply with increasing HDPE content. The impact energy of the HDPE-rich blends exceeded that of pure HDPE, implying that the HDPE polymer can be further toughened by the incorporation of brittle PS minor phase in the presence of SEBS compatibilizer. The correlation between the impact property and morphology of the blends is discussed. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1099–1108, 1998     

The Influence of NBR-g-GMA Compatibilizer on the Morphology and Mechanical Properties of Poly (ethylene terephthalate)/Polycarbonate/NBR Ternary Blends

The work aims to study the role of NBR-g-GMA compatibilizer on the morphology and mechanical characteristics of PET/PC/NBR ternary blends. The compatibilizer content and amount of constitutive polymers are changed to correlate morphology development with mechanical properties. Various ternary samples are prepared using a twin-screw extruder whereat weight percent of rubbery dispersed phase (NBR+NBR-g-GMA) is changed. Analyzing the morphology of produced samples and interpretation of mechanical properties corroborated the role of the mentioned factors on the type of morphology and also the size of both individual and composite domains in these sorts of ternary blends. Based on this attempt, the mechanical properties of 50/50 blends of NBR/NBR-g-GMA, showed maximum toughness value compared to pure PET specimen. Also, the results revealed that by increasing the rubber content, the rodlike structures were disappeared; besides, toughness was increased. On the contrary, by increasing PC content, rodlike structures have seen by morphological study; however, core-shell droplets formed in the blend structure caused enhancing the impact strength and reducing Young's modulus. Ultimately, the ternary blend of 63/7/30 of PET/PC/ (NBR+NBR-g-GMA) revealed the best mechanical properties due to proper interaction between the PET matrix and rubbery domains in the presence of reactive compatibilizer.     

Interfacial modification of high density polyethylene/glass fiber reinforced and non reinforced polyamide 66 blends

High density polyethylene (HDPE) and polyamide (PA66) are well known to be incompatible. An ionomer (Surlyn) was added as a compatibilizer to HDPE and glass fiber reinforced (HDPE/GFRPA66) and non‐reinforced (HDPE/PA66) blends. Two compositions were considered: 25/75 wt % and 75/25 wt %, with an emphasis on the former formulation. The influence of the compatibilizer on the rheology, thermal properties, and the morphology, as well as mechanical properties of the blends, was investigated using melt flow index measurements, DSC, scanning electron microscopy (SEM), and impact strength. The ionomer was found to be more effective as a compatibilizer with HDPE as a minor phase compared to the case when HDPE becomes the major phase. The results indicated that the interfacial properties of the blends were improved, with a maximum appearing at a critical concentration of the ionomer (7.5 vol %). At this level of compatibilization, SEM analysis revealed better interfacial adhesion and a finer dispersion. MFI results revealed a probable reaction between the amine groups of PA66 and the acid functions of the ionomer. The mechanical properties support the above results and showed that the addition of 25 wt % HDPE did not affect the properties of PA66 much and the presence of glass fiber did not hinder the effect of the compatibilizer. Only 20% decrease in notched Izod impact strength of the blends is observed at 7.5 vol % ionomer content, suggesting that the addition of 25 wt % of HDPE to PA66 is not detrimental at this level of compatibilization. The emulsification curve was established and revealed that, in terms of impact properties, the finer the particle size, the higher the impact strength corresponding to 7.5 vol % ionomer content. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1748–1760, 2005     

增容剂对HDPE/PC共混体系性能的影响

系统研究了增容剂（LDPE-g-DABPA)对高密度聚乙烯（HDPE）／聚碳酸酯（PC）共混体系形态及拉伸性能、冲击性能、热性能、流动性能的影响，确定了增容剂的最佳用量。结果表明，在HDPE／PC／LDPE-g-DABPA为85／15／16时，体系拉伸强度没有变化，而冲击强度由未增容的13．86kJ/m增加到55．31kJ/m，提高了3倍，MFR由1．65g/10min增加到2．16g/10min，用裂纹扩展功（G1c)评价LDPE-g-DABPA的增容效果，结果表明，体系的G1c由增容前的0．0955J增加到0．2025J，说明LDPE-g-DABPA有良好的增容作用。     

PP／HDPE／SBS三元共混物的研究——形态结构与性能

研究了PP/HDPE/SBS三元共混物的性能及形态结构特征。研究结果表明,PP三元共混物的冲击韧性除与SBS的含量密切相关外,还与HDPE的含量有关,HDPE起到了与SBS相似的增韧作用。由于HDPE的掺入,减少了SBS的含量,制成了一种力学性能均衡的超高韧性PP三元共混材料。形态结构的研究表明,共混物中,SBS呈颗粒状分布,另外SBS还与HDPE组成了具有包藏结构的复合粒子。     

十八烷基缩水甘油醚的合成及其增容尼龙6/高密度聚乙烯共混体系的研究

利用十八醇和环氧氯丙烷反应合成了十八烷基缩水甘油醚(OGE),并将其作为熔融共混方法中的增容剂,制备了尼龙6(PA6)/高密度聚乙烯(HDPE)共混材料。研究了OGE用量对共混物的热性能、结晶行为、形态结构、力学性能及吸水性的影响。结果表明,OGE促进了HDPE在PA6基体中的分散,在保持共混材料吸水率的同时,有效改善了共混物的力学性能,与未加入增容剂的PA6/HDPE共混物相比,OGE含量为2.9%(m/m)时,共混材料的缺口冲击强度、拉伸模量、断裂伸长率、弯曲强度分别提高了12%、33%、95%、6%,拉伸强度基本保持不变,而弯曲模量下降了8%。     

PC/UHMWPE/(HDPE/LDPE)-g-GMA共混物的形态结构与力学性能

采用反应挤出增容方法，制备了PC／UHMWPE／(HDPE／LDPE)-g-GMA共混物，并对其力学性能和形态结构进行研究。结果表明：共混物的冲击断面出现了严重的撕裂现象，基体产生了剪切屈服形变；共混物的拉伸强度随相容剂和UHMWPE用量的增加而降低，冲击强度随着相容剂用量的增加呈现先增加后减小的变化；当相容剂用量为6份时，冲击强度达到最大值66kJ／m^2，比未增容的PC／UHMWPE共混物提高了28．5kJ／m^2。