HDPE—g—GMA增容PC／UHMWPE的形态结构和力学性能

研究了增容剂HDPE－g-GMA对PC／UHMWPE共混体系的形态结构和力学性能的影响，HDPE－g-GMA的加入有效提高了PC／UHMWPE共混体系的相容性，分散相的尺寸得以降低，两组之间的结合力提高，共混物的冲击断面呈明显的韧性断裂特性，冲击强度较未增容体系提高60％以上，当共混体系中UHMWPE的用量不变时，增容剂用量增加将产生更多的，较容易屈服的局部单元，共混物的屈服强度随之降低；增容剂用量增加，。共混物的拉伸强度略有下降。     

mPE-g-MAH对HDPE/木粉复合材料的改性

采用废木粉填充高密度聚乙烯（HDPE）制备木塑复合材料。采用马来酸酐接枝茂金属聚乙烯（mPE—g-MAH）对复合材料进行增容和增韧，并阐述了它的增容和增韧机理。讨论了mPE—g—MAH用量对复合材料的力学性能如拉伸强度、冲击强度、弯曲强度、弯曲模量的影响。结果表明，mPE—g—MAH不仅可明显提高复合材料的强度和韧性，而且也使材料的弯曲模量有了一定的提高。当其质量分数为16％时，复合材料的拉伸强度、冲击强度分别由原来的16．2MPa和4．5kJ／m^2提高到30．5MPa和9．8kJ／m^2。     

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。     

HDPE/PC/EVA共混体系的性能研究

研究了乙烯-醋酸乙烯共聚物(EVA)增容高密度聚乙烯(HDPE)和聚碳酸酯(PC)共混体系，讨论了EVA，PC对HDPE／PC共混合金性能的影响。结果表明：随PC用量的增加，HDPE／PC共混合金的熔体流动速率减小，缺口冲击强度增大，拉伸强度增大，维卡软化点变化不大。EVA能够改善合金体系的加工流动性，却明显降低了合金体系的力学性能。     

PP/PS合金的研制

研究了苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)对聚丙烯／聚苯乙烯(PP／PS)合金的形态结构和力学性能的影响。结果表明：SBS是PP／PS合金良好的增容剂，只要体系中加入质量分数少于10％的SBS，就能很大程度提高合金的冲击强度，改善体系的相形态结构；当m(PP)：m(PS)=75：25时，与简单物理共混的PP／PS相比。其冲击强度由4．53kJ/m2增加到65．36kJ／m^2；同时随PS质量分数的增加，体系的刚性也增强。     

PS/HDPE无卤阻燃复合材料的增韧研究

以弹性体为增韧剂,聚苯乙烯接枝马来酸酐(PS-g-MAH)为增容剂,聚磷酸铵、季戊四醇膨胀阻燃体系复配微胶囊化红磷为阻燃剂,制备了聚苯乙烯/高密度聚乙烯(PS/HDPE)无卤阻燃复合材料,考察了PS与HDPE配比、弹性体种类及用量、PS-g-MAH接枝率及用量对复合材料力学性能及微观结构的影响。结果表明:当PS:HDPE=75:25时,复合材料的冲击强度提高至1.41kJ/m2;SEBS与SBS配比为1:1.7时,可使PS/HDPE无卤阻燃复合材料的拉伸强度增至21.3MPa,冲击强度达到2.81kJ/m2;添加12份接枝率为3.7%的PS-g-MAH后,PS/HDPE/SEBS/SBS无卤阻燃复合材料的冲击强度达到了4.89kJ/m2。     

组分对PC/PBT/GF三元复合材料的影响

通过双螺杆挤出机制备了聚碳酸酯(PC)/聚对苯二甲酸丁二酯(PBT)/玻璃纤维(GF)三元复合材料,研究了PC,PBT,GF以及增容剂的含量对复合材料的影响。结果表明,在PC/PBT体系中,当PC∶PBT=7∶3时复合材料可以达到较好的刚韧平衡,拉伸强度为71.6 MPa,缺口冲击强度为10.21 kJ/m~2;在PC/PBT/GF复合材料中GF可以起到异相成核的作用,提高了复合材料的结晶速度,随着GF含量的增加,弯曲强度逐渐增加,拉伸强度先上升后下降,缺口冲击强度先下降后上升;增容剂KH–550,AX8900以及PTW均能改善PC/PBT/GF三元复合材料的相容性,其中AX8900增容效果最佳,从力学性能表明,加入1%的AX8900,PC/PBT/GF复合材料的性能最平衡,弯曲弹性模量和缺口冲击强度分别是没有添加增容剂的1.13倍和2.11倍。     

环氧类增容剂反应增容PLA/PBAT共混体系的研究

以环氧类增容剂(REC)为增容剂,采用双螺杆挤出机熔融共混制备聚乳酸(PLA)/聚对苯二甲酸己二酸丁二醇酯(PBAT)共混物。研究了增容剂对共混体系微观结构、力学性能和热性能的影响。结果表明,添加适量REC可以提高PLA与PBAT的相容性,改善PLA/PBAT共混体系的综合力学性能;REC用量为1.4份时共混体系呈现出良好的相容性,此时共混物冲击强度由268 kJ/m2增加到621 kJ/m2、断裂伸长率提高由222 %增加到357 %。     

天然橡胶增韧聚氯乙烯的研究

采用未改性的标准天然橡胶(NR)作增韧剂,通过机械共混法制备增韧聚氯乙烯(PVC)复合材料,考察了NR和增容剂用量对PVC增韧效果以及力学性能的影响.结果表明:当NR用量为10份时,材料的冲击强度最高为24.87 kJ/m2;加入增容剂环氧化天然橡胶(ENR)后,材料的冲击强度随其用量的增加而增大,在ENR为5份时其冲击强度为69.86 kJ/m2;氯化聚乙烯(CPE)作增容剂时,其冲击强度先升后降,在4份时达到峰值103.93 kJ/m2;氯化橡胶(CNR)作增容剂在3份时,其冲击强度达到最佳值35.37 kJ/m2;增容增韧后共混物的拉伸强度普遍降低.     

后处理工艺对聚碳酸酯激光烧结件性能的影响

采用环氧树脂（EP）对聚碳酸酯（PC）烧结件进行后处理,研究了后处理工艺对PC烧结件力学性能的影响。结果表明,经EP处理后的PC烧结件由多孔性物质变为密实性物质,其拉伸强度及模量、冲击强度等性能均大幅度提高,其中,拉伸强度由0.39～2.29 MPa提高到约40 MPa,拉伸模量由2.19～17.13 MPa提高到约500 MPa,冲击强度从0.92～3.13 kJ/m2提高到约7 kJ/m2。     

HDPE／NBR共混物的性能和结构研究

通过熔融共混法制备了HDPE/NBR（NBR为丁腈橡胶）二元共混物和HDPE/NBR/HDPE-g-MAH（MAH为马来酸酐）三元共混物，研究了其力学性能和相态结构。结果表明：对于极性不同的二元共混体系，加入15%（质量含量，下同）的NBR即可行到冲击强度为712.2J/m、相态结构为平行排列的丝状共混物；对于加有相容剂HDPE-g-MAH的三元共混体系，尽管冲击强度达到845.9J/m，但此时NBR加入量为25%，且相容剂的制备工艺繁琐，质量不好控制。     

Double‐yielding behavior in injection‐molded polycarbonate/high‐density polyethylene/ethylene–vinyl acetate copolymer blends

A uniaxial tensile test was performed for polycarbonate (PC)/high‐density polyethylene (HDPE)/ethylene–vinyl acetate copolymer (EVA) blends with a fixed EVA content but various PC contents. The double‐yielding phenomenon and its composition dependence, as observed in the PC/HDPE blend, were again detected. EVA did not serve as a successful compatibilizer of PC and HDPE in the PC/HDPE/EVA blend. The incorporation of EVA resulted in a larger size and a more irregular shape of the PC fibers, as indicated in the scanning electron microscope observations; this, consequently, produced a higher serious stress concentration in the blend. This more complicated and instable morphology produced different double‐yielding behaviors in the PC/HDPE/EVA blends compared with the binary one. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Studies on high density polyethylene (HDPE) functionalized by ultraviolet irradiation and its application

The structure and properties of high density polyethylene (HDPE) functionalized by ultraviolet irradiation at different light intensities in air were studied by electron analysis, FTIR spectroscopy, contact angle with water, differential scanning calorimetry and mechanical properties measurement. The results show that oxygen‐containing groups such as C?O, C—O and C(?O)O were introduced onto the molecular chain of HDPE following irradiation, and the rate and efficiency of HDPE functionalization increased with enhancement of irradiation intensity. After irradiation, the melting temperature, contact angle with water and notched impact strength of HDPE decreased, the degree of crystallinity increased, and their variation amplitude increased with irradiation intensity. Compared with HDPE, the yield strength of HDPE irradiated at lower light intensity (32 W m^?2 and 45 W m^?2) increases monotonically with irradiation time, and the yield strength of HDPE irradiated at higher light intensity (78 W m^?2) increases up to 48 h and then decreased with further increase in irradiation time. The irradiated HDPE behaved as a compatibilizer in HDPE/polycarbonate (PC) blends, and the interface bonding between HDPE and PC was ameliorated. After adding 20 wt% HDPE irradiated at 78 W m^?2 irradiation intensity for 24 h to HDPE/PC blends, the tensile yield strength and notched Izod impact strength of the blend were increased from 26.3 MPa and 51 J m^?1 to 30.2 MPa and 158 J m^?1, respectively. Copyright © 2003 Society of Chemical Industry     

Comparison of olefin copolymers as compatibilizers for polypropylene and high‐density polyethylene

Some polyolefin elastomers were compared as compatibilizers for blends of polypropylene (PP) with 30 wt % high‐density polyethylene (HDPE). The compatibilizers included a multiblock ethylene–octene copolymer (OBC), two statistical ethylene–octene copolymers (EO), two propylene–ethylene copolymers (P/E), and a styrenic block copolymer (SBC). Examination of the blend morphology by AFM showed that the compatibilizer was preferentially located at the interface between the PP matrix and the dispersed HDPE particles. The brittle‐to‐ductile (BD) transition was determined from the temperature dependence of the blend toughness, which was taken as the area under the stress–strain curve. All the compatibilized blends had lower BD temperature than PP. However, the blend compatibilized with OBC had the best combination of low BD temperature and high toughness. Examination of the deformed blends by scanning electron microscopy revealed that in the best blends, the compatibilizer provided sufficient interfacial adhesion so that the HDPE domains were able to yield and draw along with the PP matrix. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

（PE—HD／PE—LD）—g—GMA增容PC／PE—UHMW共混物的冲击性能与断面形态

采用反应挤出方法，制备了缺口冲击性能良好的(PE-HD／PE-LD)-g-GMA(甲基丙烯酸缩水甘油脂)增容PC／PE-UHMW共混物。当增容剂(PE-HD／PE-LD)-g-GMA用量为6份时，共混物的冲击强度达到最大值66kJ／m^2，比未增容PC／PE-UHMW提高了28．5kJ／m^2。冲击断面的SEM分析表明，增容剂的加入产生了反应性的增容效果，提高了两相之间的界面粘结力，促进了相的分散，对基体的剪切屈服形变有利，冲击性能得以改善。     

超高分子量聚乙烯/高密度聚乙烯共混物的低温冲击研究

通过DSC、SEM和动态流变法分析超高分子量聚乙烯/高密度聚乙烯(UHMWPE/HDPE)共混物的相容性。结果表明:UHMWPE和HDPE具有良好的相容性。UHMWPE/HDPE共混物是典型的假塑性流体,当HDPE的质量分数逐渐增大,共混物的复数黏度明显减小,其流动性变好。UHMWPE能够显著提高共混物的低温冲击性能,当UHMWPE含量超过40%,共混物在-60℃的缺口冲击强度在70 kJ/m²以上。当UHMWPE含量为50%,共混物的熔体流动速率为0.12 g/10min,-60℃缺口冲击强度达到77 kJ/m²,使加工性和低温冲击性能达到平衡。     

Studies on high density polyethylene/polycarbonate blend system compatibilized with low density polyethylene grafted diallyl bisphenol A ether

Blends of a high density polyethylene (HDPE) matrix and a polycarbonate (PC) minor phase were investigated through their morphology, heat resistance, mechanical properties, crystallizing behavior, rheological measurement and especially the compatible effect of a compatibilizer: low density polyethylene grafted diallyl bisphenol A ether (LDPE-g-DBAE). The blends without compatibilizer exhibited a phase growth and no adhesive between the HDPE matrix and the dispersed phase. In the presence of 10% by weight of LDPE-g-DBAE as a compatibilizer, more fine particles and a dim phase interface were observed, and the blends showed a remarkable increase in heat distortion temperature and mechanical properties. The compatibilized blends possessed a high apparent viscosity as compared with the noncompatibilized ones. However, the apparent viscosity of the blends, with or without the compatibilizer, was lower than that of the neat HDPE and PC. Exploration by DSC found that the melting point and the crystallinity of HDPE in the blends decreased, and especially for the blends with the compatibilizer. These facts could be interpreted in terms of the efficient compatible effect of the LDPE-g-DBAE, which resulted from the interaction between the diallyl bisphenol A ether unit of LDPE-g-DBAE and polycarbonate, and the miscibility of the LDPE unit and HDPE.