POE/POE-g-MAH/PP-g-MAH增韧PP/滑石粉研究

以聚丙烯(PP)/滑石粉复合体系为基料,马来酸酐接枝聚乙烯辛烯弹性体(POE-g-MAH)、聚乙烯辛烯弹性体(POE)以及聚丙烯接枝马来酸酐(PP-g-MAH)作为增韧剂,利用双螺杆挤出机进行熔融共混,研究了不同增韧剂对共混体系的力学性能、流变性能和结晶性能,并通过XRD、红外光谱和DSC进行综合测试。实验结果表明:三种增韧剂对PP/滑石粉复合体系的性能有显著影响,综合增韧效果以PP-g-MAH为最佳。红外表征、XRD和DSC分析表明:三种增韧剂对PP/滑石粉复合体系中的PP分子链有一定相互作用。     

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。     

增容剂对PBT/PP共混物结构性能的影响

以乙烯/乙酸乙烯酯共聚物接枝马来酸酐(EVA-g-MAH)、乙烯/辛烯共聚物接枝马来酸酐(POE-g-MAH)为增容剂,采用熔融共混法制备了不同组成比例的PBT/PP共混物,通过DSC、TG、XRD、SEM等多种手段测试了共混物的性能,详细研究PBT/PP质量比、增容剂种类和用量对共混物结构性能的影响。结果表明:PBT/PP的质量比为70/30时,所得共混物的微观形貌最好;加入2种增容剂增容后发现,EVA-g-MAH对PBT/PP共混物相容性的改善效果比POE-g-MAH的增容效果好,并且PBT/PP/EVA-g-MAH的质量比为70/30/3时共混体系相容性最好。     

POE熔融接枝GMA的制备及其增韧PBT的应用研究

采用熔融接枝法制备聚烯烃热塑弹性体(POE)接枝甲基丙烯酸缩水甘油酯(GMA),将接枝物[POE-g-(GMA-g-St))]用于聚对苯二甲酸丁二醇酯(PBT)的增韧改性。研究了接枝物含量对共混物力学性能、结构以及熔融结晶行为的影响。结果表明:POE-g-(GMA-g-St)对PBT具有良好的增韧效果,当加入弹性体30%时,共混物的冲击强度为71.97 kJ/m2。SEM图像显示:作为分散相的接枝物在PBT基体中的尺寸更小且粒径分布更均匀。DSC图像显示出现两个熔融峰且随接枝物含量的增加其结晶度逐渐降低。     

POE接枝GMA的制备及其增韧PBT的研究

采用熔融接枝法制备聚烯烃热塑弹性体(POE)接枝甲基丙烯酸缩水甘油酯(GMA),将接枝物(POE-g-(GMA-g-St))用于聚对苯二甲酸丁二醇酯(PBT)的增韧改性,研究接枝物含量对PBT/POE-g-(GMA-g-St)共混物力学性能、结构以及熔融结晶行为的影响。结果表明:POE-g-(GMA-g-St)对PBT具有良好的增韧效果,当弹性体中加入25%时,共混物的冲击强度为66.62 kJ/m2。SEM图像显示:作为分散相的接枝物在PBT基体中的尺寸更小且粒径分布更均匀。DSC图像显示出现两个熔融峰且随接枝物含量的增加使其结晶度逐渐降低。     

界面作用对PP/PA6共混体系相结构与力学性能的影响

研究了两种相容剂马来酸酐接枝聚丙烯(PP-g-MAH)、马来酸酐接枝乙烯-辛烯共聚物弹性体(POE-g-MAH)对聚丙烯/尼龙6(PP/PA6)共混体系力学性能的影响.通过扫描电子显微镜(SEM)、差示扫描量热仪(DSC)分析和力学性能测试,研究了相容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和力学性能的影响.研究结果表明:两种相容剂的加入都使PP/PA6体系的相容性增加,但PP-g-MAH的加入主要表现为增强效果,而POE-g-MAH的加入主要表现为增韧效果.     

1-丁烯/1-己烯共聚物增韧聚丙烯的研究

采用实验室合成的1-丁烯/1-己烯共聚物(PBH)和杜邦的POE弹性体对聚丙烯进行增韧改性,研究了加入不同质量分数增韧剂对体系力学性能的影响,对二者的增韧效果进行了比较。通过偏光显微镜、扫描电镜、DSC表征了共混体系的相容性和结晶情况,探索共混体系的微观形态与材料性能的关系,加入相同量的POE与PBH,断裂伸长率和冲击强度的增幅相差不多,表明PBH具有与POE弹性体相近的增韧效果,但是拉伸强度比POE弹性体有一定幅度降低,随着增韧剂添加量的增加,冲击强度增加明显,弯曲强度下降。SEM结果表明,PBH在PP中的分散比POE要好,偏光显微镜照片表明,PBH比POE的破坏PP结晶的程度更大,晶粒尺寸更细。DSC结果表明,PBH可以使共混体系的熔点下降,结晶温度升高,对PP的结晶有明显的影响。     

玻璃纤维增强耐高温液晶聚酯的增韧改性研究

以液晶聚酯为基体树脂,研究三元乙丙弹性体(EPDM)和/或聚乙烯辛烯共弹性体(POE)为增韧剂,通过双螺杆挤出机熔融反应挤出,用马来酸酐使POE酸酐化生产接枝共聚物POE-g-MAH;然后,把接枝好的POE-g-MAH加到液晶聚酯中,用双螺杆挤出机造粒、注射机制样,制备了LCP/POE-g-MAH共混的样条,研究了LCP/POE-g-MAH=90/10、80/20、70/30、60/40、50/50(质量比)共混的冲击、拉伸强度等性能的影响。结果表明:POE对液晶聚酯有一定的增韧作用,提高了树脂的冲击强度,但是POE的用量也不是越多越好,POE达到一定的程度后,增韧的作用将降低,而且还会影响其他性能。     

POE接枝MA增韧PBT的研究

用熔融接枝法制备的马来酸酐接枝乙烯-1-辛烯共聚物(POE-g-MA)对聚对苯二甲酸丁二醇酯(PBT)的增韧改性,研究了不同接枝率的POE-g-MA对PBT/POE-g-MA共混物力学性能、结构以及熔融结晶行为的影响。结果表明,POE接枝MA后可明显提高POE与PBT的相容性及PBT的冲击性能,但接枝率过高反而会影响界面黏结,使冲击性能降低。     

POE/HDPE/PP三元复合材料的形貌和力学性能研究

用熔融共混法制备了高密度聚乙烯/聚丙烯(HDPE/PP)和乙烯-辛烯弹性体/高密度聚乙烯/聚丙烯(POE/HDPE/PP)复合材料。通过冲击、弯曲和拉伸测试研究了复合材料的力学性能,采用扫描电镜(SEM)观察了材料的形貌。结果表明,由于HDPE和PP的相容性有限,限制了HDPE对PP综合力学性能的提高;通过添加POE,能改善HDPE/PP共混物的相容性,使HDPE/PP复合材料在保持较高弯曲和拉伸性能的前提下,抗冲击性能获得明显提高。当HDPE/PP的含量比为12/88和POE含量为8wt%时,POE/HDPE/PP三元复合材料的综合力学性能较好。     

Synergistic toughening effects of nucleating agent and ethylene–octene copolymer on polypropylene

The synergistic toughening effect of nucleating agent (NA) and ethylene–octene copolymer (POE) on polypropylene was studied in the present work. Two different nucleating agents, such as α-form nucleating agent 1,3 : 2,4-bis (3,4-dimethylbenzylidene) sorbitol (DMDBS, Millad 3988) and β-form nucleating agent aryl amides compounds (TMB-5), were selected to blend with PP or PP/POE blends, respectively. The results show that PP containing 0.5–0.25 wt % DMDBS or 0.5–0.25 wt % TMB-5 has relatively low impact strength. For PP/POE blends, although the impact strength increases gradually with the increasing of POE content, high content of POE is needed to obtain the available PP toughness. However, once nucleating agent and POE are simultaneously added into PP, PP/POE/NA blends show great improvement of toughness even at low POE content. Furthermore, the synergistic toughening effect of POE/TMB-5 is more apparent than that of POE/DMDBS. SEM results show that whether DMDBS or TMB-5 has no apparent effect on the morphologies of POE in the PP/POE/NA blends. Further investigations using DSC and POM indicate that both DMDBS and TMB-5 induce the apparent enhancement of the crystallization temperature of PP and the sharp decrease of spherulites size of PP in the PP/POE/NA blends. The possible synergistic toughening mechanism is discussed in the work. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

POE和自制成核剂协同增透增韧PP的研究

以弹性体乙烯-辛烯共聚物(POE)和自制成核剂为助剂制备了高韧性、高透明聚丙烯(PP)材料.通过DSC、PLM、雾度等测试手段研究了不同POE含量的共混体系的结晶行为、力学和透明性能.结果表明:随着弹性体POE加入量的不断增加,PP的结晶度出现先增大后降低的变化趋势;弹性体POE在加入量较少(质量分数小于10%)时和成核剂具有协同成核效果,可以提高PP的结晶峰温度,提高结晶度,降低材料雾度;在POE质量分数为10%时,可以很好地改善体系的加工性能.     

Phase Morphology and Mechanical Properties of Rubber-Toughened Polypropylene Nanocomposites: Effect of Elastomer Polarity

The objective of this work was to investigate the effect of elastomer polarity on phase structure and mechanical properties of PP nanocomposites. The nonpolar and polar elastomers studied were polyethylene octene (POE) and polyethylene octene grafted maleic anhydride (POEgMAH), respectively. The results from mechanical studies showed that the POEgMAH-toughened polypropylene nanocomposites have higher Izod impact strength but lower tensile and flexural properties than the unmaleated ones. X-ray diffraction (XRD) was used to characterize the formation of nanocomposites. XRD studies revealed that intercalated rubber-toughened PP nanocomposites (RTPPNC) had been successfully prepared where the macromolecule segments PP were intercalated into the interlayer space of organoclay. XRD also indicated that the incorporation of polar POEgMAH elastomers into PP nanocomposites contribute to a better intercalation effect and formed a more exfoliated combinations structure compared to POE. Scanning electron microscope (SEM) was used for the investigation of the phase morphology and rubber particle size and particle-size distribution. SEM study revealed a two-phase morphology where POE as droplets dispersed finely and uniformly in the PP matrix. The POEgMAH-toughened PP nanocomposites shows a much finer dispersion of elastomer particles than POE-toughened PP nanocomposites.     

Crystallization behavior and mechanical properties of polypropylene random copolymer/poly(ethylene‐octene) blends

New polymer blends of polypropylene random copolymer (PP‐R) and poly(ethylene‐octene) (POE) were prepared by melt‐blending process using a corotating twin‐screw extruder. The POE content was varied up to 35%. The toughening efficiency of POE for PP‐R was evaluated by the mechanical properties of the resulted PP‐R/POE blends. The crystallization behavior and morphology of the blends were also studied. Results show that POE acts as nucleation agent to induce the crystallization of PP‐R matrix at higher crystallization temperature. Super‐toughened PP‐R/POE blends (Izod impact strength more than 500 J/m) can be readily achieved with only 10 wt % of POE. The high toughness of PP‐R/POE is attributed to cavitation and shear yielding of matrix PP‐R, as revealed by the morphology studies. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

高流动性聚丙烯增韧体系的研究

比较了聚烯烃弹性体、三元乙丙橡胶等对聚丙烯的改性效果,讨论了在增韧母料和降温母料的共同作用下这两种增韧剂的不同影响,对不同体系的扫描电镜结果和结晶参数进行了分析。     

新型聚烯烃弹性体增韧聚丙烯的研究

采用茂金属聚烯烃弹性体（POE）代替传统的弹性体,对聚丙烯（PP）增韧改性,并且比较了PP1/POE和PP2/POE两个共混体系的力学性能和流动性。通过偏光显微镜和扫描电镜观察试样,研究共混体系的微观形态与材料性能的关系,结果表明POE对PP晶粒有细化作用,两相相容性较好,POE能显著提高PP的冲击韧性。     

Influences of ethylene–butylacrylate–glycidyl methacrylate on morphology and mechanical properties of poly(butylene terephthalate)/polyolefin elastomer blends

Elastomer ethylene–butylacrylate–glycidyl methacrylate (PTW) containing epoxy groups were chosen as toughening modifier for poly(butylene terephthalate) (PBT)/polyolefin elastomer (POE) blend. The morphology, thermal, and mechanical properties of the PBT/POE/PTW blend were studied. The infrared spectra of the blends proved that small parts of epoxy groups of PTW reacted with carboxylic acid or hydroxyl groups in PBT during melt blending, resulting in a grafted structure which tended to increase the viscosity and interfere with the crystallization process of the blend. The morphology observed by scanning electron microscopy revealed the dispersed POE particles were well distributed and the interaction between POE and PBT increased in the PBT/POE/PTW blends. Mechanical properties showed the addition of PTW could lead to a remarkable increase about 10‐times in impact strength with a small reduction in tensile strength of PBT/POE blends. Differential scanning calorimetry results showed with increasing PTW, the crystallization temperature (T_c) and crystallinity (X_c) decreased while the melting point (T_m) slightly increased. Dynamic mechanical thermal analysis spectra indicated that the presence of PTW could improve the compatibility of PBT/POE blends. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40660.     

β成核剂与乙烯/辛烯共聚物弹性体的协同增韧效应研究

研究了新型稀土β成核剂以及无定形的乙烯／辛烯共聚物弹性体（简称POE）对等规聚丙烯（IPP）增韧改性的协同作用。结果显示,随着成核剂含量的增加,β成核IPP以及β成核IPP／POE共混体系具有相同的变化趋势,POE分散相的存在对1PP体系中的β含量没有明显的影响。不同弹性体含量的共混体系以及各体系在不同温度下的冲击韧性的对比研究表明POE在一定含量时与β成核剂能够获得最大程度的协同效应,在较高POE含量时,二者的协同效应在低温下能够得到较好的表现。     

Rubber‐toughened polypropylene nanocomposite: Effect of polyethylene octene copolymer on mechanical properties and phase morphology

Rubber‐toughened polypropylene (PP)/org‐Montmorillonite (org‐MMT) nanocomposite with polyethylene octene (POE) copolymer were compounded in a twin‐screw extruder at 230°C and injection‐molded. The POE used had 25 wt % 1‐octene content and the weight fraction of POE in the blend was varied in the range of 0–20 wt %. X‐ray diffraction analysis (XRD) revealed that an intercalation org‐MMT silicate layer structure was formed in rubber‐toughened polypropylene nanocomposites (RTPPNC). Izod impact measurements indicated that the addition of POE led to a significant improvement in the impact strength of the RTPPNC, from 6.2 kJ/m² in untoughened PP nanocomposites to 17.8 kJ/m² in RTPPNC containing 20 wt % POE. This shows that the POE elastomer was very effective in converting brittle PP nanocomposites into tough nanocomposites. However, the Young's modulus, tensile strength, flexural modulus, and flexural strength of the blends decreased with respect to the PP nanocomposites, as the weight fraction of POE was increased to 20 wt %. Scanning electron microscopy (SEM) was used for the investigation of the phase morphology and rubber particles size. SEM study revealed a two‐phase morphology where POE, as droplets was dispersed finely and uniformly in the PP matrix. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99: 3441–3450, 2006