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聚丙烯混杂复合体系的界面和力学性能 总被引:9,自引:0,他引:9
从刚性粒子增韧聚合物体系的界面层性质入手,研究了带有柔性分子链界面改性剂包覆的高岭土(Kaolin)刚性粒子增韧的,短切玻纤(GF)增强的聚丙烯(PP)混杂复合体系的微观结构,结晶性质,PP/Kaolin/GF混杂复合材料的加工流动性及力学性能.实验结果表明,所合成的界面改性剂对PP/Kaolin复合材料有显著的增韧效果;加入少量的短切玻纤可以弥补因界面改性剂引入而引起的PP/Kaolin复合材料强度和模量降低的缺点;经界面改性剂包覆的高岭土刚性粒子和短切玻纤同时加入PP,混杂复合后,PP复合材料的冲击韧性大幅度提高,材料的强度和模量不降低.这个结果不仅在较低的Kaolin含量下,而且可在Kaolin含量为50%(wt%)的高填充量下也得以实现 相似文献
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嵌段共聚偶联剂对玻璃纤维增强聚丙烯界面粘结的影响 总被引:5,自引:0,他引:5
合成了苯乙烯与丁二烯及含C==C硅烷的嵌段共聚偶联剂。采用该嵌段共聚物对玻璃纤维进行了表面处理,通过单丝临界长度法测定了玻璃纤堆增强聚丙烯的界面剪切强度。结果表明:采用嵌段共聚偶联剂对玻璃纤维进行处理,可以有效地改善玻璃纤维增强聚丙烯的界面粘结,其界面改性效果优于普通小分子偶联剂;嵌段共聚偶联剂的分子结构对界面粘结有影响,采用适当的嵌段长度,可获得较好的界面粘结;在基体树脂中加入功能化聚丙烯。可改善复合体系的界面粘结;基体树脂分子链较长或流动性好、粘度低,有利于基体与歼堆的的界面粘结。 相似文献
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利用DSC和偏光显微镜等手段研究了部分成核剂对聚丙烯均聚物(PP)、低乙烯含量聚丙烯共聚物及聚丙烯/聚乙烯(PP/PE)共混物结晶行为的影响,结果表明所用成核剂对PP和改性PP具有一定的普适性。聚丙烯共聚物中,由于链结构规整性变差,成核剂的作用显得特别突出,而PP/PE共混物中,由于成核剂向PE相迁移而使其对PP结晶的成核效率降低。 相似文献
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聚丙烯/硫酸钡复合体系的界面相互作用与流变性质和结晶行为的关系 总被引:3,自引:0,他引:3
制备了一系列具有不同界面状态的聚丙烯 (PP) 硫酸钡 (BaSO4)复合体 .PP BaSO4的界面分别用硅烷、硬脂酸、马来酸酐接枝聚丙烯 (PP g MAH)改性 .研究表明 ,填充体系的熔体粘度和熔体弹性均高于基体 .以硅烷和PP g MAH进行界面改性后 ,PP BaSO4的界面相互作用加强 ,导致复合体系中的熔体粘度和熔体弹性进一步提高 ,同时BaSO4对PP的成核活性提高 .填料用硬脂酸处理后 ,硬脂酸能够在填料粒子表面上形成一个包覆层 ,使粒子与PP的亲和性改善 .同时该包覆层具有润滑作用 ,使得复合体系的熔体粘度和熔体弹性下降 ,并使得该体系中BaSO4的成核活性低于硅烷和处理的体系 .本文探讨了由复合体系的熔体粘度定量比较填充复合体系中聚合物 填料界面相互作用的方法 ,讨论了界面改性对复合体系流变性质和结晶行为影响的机理 相似文献
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采用静电纺丝技术, 结合正硅酸乙酯(TEOS)的溶胶-凝胶反应制备出了直径为500 nm的SiO2短纤维(n-SF). 纤维经过硅烷偶联剂KH570表面处理后, 与聚丙烯(PP)通过螺杆混合制得复合材料. 通过SEM观察, KH570处理过的SiO2短纤维(n-MSF)在PP基体中分散均匀, 界面结合良好. DSC和XRD测试结果表明, n-SF和n-MSF的加入均可提高PP的结晶速率, 同时改变PP中β晶含量, 进而影响冲击强度; 冲击实验结果表明, n-MSF添加量为3%(质量分数)时, 复合材料冲击性能比纯PP提高了40.3%. 相似文献
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Sinto Jacob K. K. Suma Jude Martin Mendaz Abhilash George K. E. George 《Macromolecular Symposia》2009,277(1):138-143
Poly(propylene) (PP) reinforced with short glass fiber was modified with precipitated nanosilica (pnS) by melt mixing. The weight of the glass fiber was varied by keeping the pnS at optimum level. The properties of the composites were studied using universal testing machine, dynamic mechanic analyser (DMA), differential Scanning calorimetry (DSC) and thermo gravimetric analyser (TGA). The amount of the glass fiber required for a particular modulus could be reduced by the addition of nanosilica. 相似文献
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The polypropylene/glass fiber(PP/GF) composites with excellent antistatic performance and improved mechanical properties have been reported by incorporation of a very small amount of the organic salt, lithium bis(trifluoromethanesulfonyl)imide(Li-TFSI), into the PP/GF composites. It was considered that GF could play the role as the pathways for the movements of ions in the ternary composites. In this work, the interactions between Li-TFSI and glass fiber and the effects of such interactions on the physical properties of the composites have been systematically investigated. Three types of glass fibers with different ―OH group concentrations have been prepared in order to compare the interactions between GF and Li-TFSI. It was found that the ―OH group concentrations on the surface of glass fiber have significant effects on interactions between glass fibers and Li-TFSI. Such interactions are crucial for both the antistatic and mechanical performances of the final PP/GF/Li-TFSI composites. The investigation indicated that the GF with high ―OH group concentrations confined the movement of TFSI-, which decreased the antistatic properties of PP/GF/Li-TFSI composites. On the other hand, the GF with low ―OH group concentrations inhibited the absorption of Li-TFSI onto the GF, which also hindered the formation of Li-TFSI conductive pathway. The best antistatic performance of the ternary composites can be achieved at the intermediate ―OH concentrations on the GF. 相似文献
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Mechanical properties and morphological structures of short glass fiber reinforced PP/EPDM composite
Weizhi Wang 《European Polymer Journal》2003,39(11):2129-2134
The mechanical properties and crystal morphological structures of short glass fiber (SGF) reinforced dynamically photo-irradiated polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM) composites were studied by mechanical tests, wide-angle X-ray diffraction (WAXD), optical microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA). The mechanical properties of PP/EPDM composites, especially the tensile strength were greatly strengthened by dynamically photo-irradiation and the incorporation of SGF. The results from the WAXD, SEM, DSC, and TGA measurements reveal: (i) the formation of β-type crystal of PP in the PP/EPDM/SGF composite; (ii) the fiber length in dynamically photo-irradiated PP/EPDM/SGF composites are general longer than that in corresponding unirradiated samples. The size of EPDM phase in the photo-irradiated composites reduces obviously whereas the droplet number increases; (iii) photo-irradiation improves the interface adhesion between SGF and polymer matrix; (iv) the melting and crystallization temperatures of the photo-irradiated composites are not affected greatly by increasing the SGF content; (v) the thermal analysis results show that the incorporation of SGF into PP/EPDM plays an important role for increasing its thermal stability. 相似文献
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偶联剂对玻璃纤维/环氧树脂基复合材料介电性能的影响 总被引:2,自引:0,他引:2
偶联剂对玻璃纤维/环氧树脂基复合材料介电性能的影响陈平刘胜平张明艳(哈尔滨理工大学电工材料系哈尔滨150040)关键词环氧树脂基复合材料,介电性能,偶联剂,浸润性玻璃纤维/环氧树脂基复合材料(GFRP)具有优异的电气和力学性能.然而孔隙的存在强烈地... 相似文献
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Studies on partial compatibility of PP and PS 总被引:1,自引:0,他引:1
<正>Blends of polystyrene(PS) and polypropylene(PP) were prepared through melt compounding.With an increase of PS content up to 30 wt%,the tensile strength of PP/PS blends increased from 37.4 MPa to 42.2 MPa,although the blends were widely regarded as immiscible.The DSC results showed that there's slight decrease in melting temperature of PP, showing insufficient evidence for partial compatibility between PP and PS.Almost no variation of distinct characterization peaks were observed in FTIR spectra of PS/PP blends compared with those of neat PP and PS,indicating there is no chemical interactions between PP and PS.Since the morphology investigation showed a droplet structure as PS content was up to 30 wt%,the improvement of tensile strength could be simply considered as due to the reinforcing effect of dispersed rigid PS particles on the PP,combining with partial compatibility between them as evaluated by change of C_p at glass transition for both PS and PP.More interestingly,DSC and DMA results showed that the blending of PS and PP could lead to a substantial decrease of the glass transition temperature(T_g) of PP,and increase of T_g of PS.The annealing experiment was carried out to understand the change of T_g in PP/PS blends.It is believed that the compressive stress generated by the contracting PP should be the dominant mechanism for the T_g elevation of PS.On the other hand,the T_g decrease of PP is likely owing to the creation of a large amount free interface of PP and the dilatation of the PP phase resulting from the corresponding tension exerted by PS during cooling. 相似文献
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The nature of the structural gradient in epoxy curing at a glass fiber/epoxy matrix interface using FTIR imaging 总被引:1,自引:0,他引:1
González-Benito J 《Journal of colloid and interface science》2003,267(2):326-332
The curing process of an epoxide system was studied at the interface formed between a silane-coated glass fiber and an epoxy matrix. The gradient in the structure of the epoxy resin as a result of the cure process at the fiber/matrix interfacial region was monitored by FTIR imaging. For comparison, the epoxy curing at the interface formed between the epoxy resin and (a) an uncoated glass fiber and (b) a polyorganosiloxane (obtained from the silane used for the glass-fiber coating) were also monitored. Chemically specific images of the OH and the H-N-H groups near the interface region were obtained. These images suggest that there is a chemical gradient in the structure of the matrix from the fiber surface to the polymer bulk due to different conversions. The basis of the different kinetics of the curing reactions is a result of amino group inactivation at the interface. This deactivation translates into an off-stoichiometry of the reaction mixture, which is a function of the distance from the surface of the glass fiber. 相似文献
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Jianpeng Fang Yue Cheng Ling Zhang Chunzhong Li 《Journal of polymer science. Part A, Polymer chemistry》2020,58(14):2022-2031
The interfacial interaction between glass fibers (GFs) and polypropylene (PP) resin is the key factor which affects the properties of GFs reinforced PP composites. The β-transcrystallization (β-TC) structure induced by β-nucleating agent (β-NA) at the interface is beneficial to improving the interfacial performance and comprehensive mechanical properties. However, due to the poor adhesive ability, it is difficult to introduce β-NAs onto GFs surface directly. In this work, for solving above problem, the sodium carboxymethyl cellulose (CMC) and NH2 functionalized multiwalled carbon nanotubes (CNTs) were used to construct the network structure on GFs (CMC-CNT-GF) through plenty of active groups. Furthermore, the zinc phthalate (ZnPht, β-NA) was synthesized and coated on GFs surface by hydrogen bonds interaction with CMC-CNT and physical anchoring effect (ZnPht@CMC-CNT-GF). Finally, the hybrid GFs reinforced PP composite (iPP/ZnPht@CMC-CNT-GF) was prepared, which exhibited enhanced tensile, flexural, and impact strength by 20.1, 9.3, and 33.3%, respectively when compared with the iPP/raw GF due to the formation of β-TC and improvement of interfacial adhesion. This study provides an effective strategy to introduce β-NAs on GFs with network structure for improving interfacial properties by inducing β-TC to enhance the strength and toughness of composite, which could be applied in other fiber/semicrystalline polymer systems. 相似文献
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一种新型低噪音碳纤维纳米电极 总被引:7,自引:3,他引:4
近年来,碳纤维超微电极在生命科学领域中已取得了广泛应用,电极的超微尺寸使之能对生物微环境进行实时监测^[1],还可作为微柱分离的检测 ^[2],自Adams研究组1976年开展微电极伏安法对细胞外液中生物胺以及有关代谢物的检测研究以来,碳纤维超微电极已成为探测脑内甚至单个细胞内神经递质的一种有力的工具,人们已对单个细胞内神经递质^[3]及激素^[4]的释放进行了探索性研究。 相似文献