共查询到17条相似文献,搜索用时 140 毫秒
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钛酸酯偶联剂对竹粉/PVC性能影响 总被引:1,自引:0,他引:1
用钛酸酯偶联剂对竹粉进行表面改性,制备竹粉/聚氯乙烯(PVC)复合材料,用傅立叶红外光谱(FT-IR)和扫描电子显微镜(SEM)进行表征,并研究偶联剂对复合材料性能的影响。结果表明,偶联剂能改善复合材料中竹粉与PVC间的相容性,提高了复合材料的拉伸强度和冲击强度。 相似文献
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对竹粉成功进行机械活化酯化改性,然后与聚氯乙烯(PVC)共混、热压制备改性竹粉/PVC复合材料,研究了复合材料的吸水性能.结果表明:与竹粉/PVC复合材料相比,机械活化酯化竹粉与PVC基体黏结性得到改善,改性竹粉/PVC复合材料的防水性能得到提高,浸水96 h后,其吸水率2.08%,尺寸变化率0.75%,弯曲强度下降了... 相似文献
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为比较碳化硅(SiC)含量对聚氯乙烯(PVC)/竹粉木塑复合材料性能的影响,以竹粉为木质纤维,PVC为基体材料,用挤出成型方法制备了不同含量SiC的PVC/竹粉复合材料,对其力学性能、摩擦磨损性能及蠕变性能测试分析。结果表明:当SiC质量分数为3%时,PVC/SiC/竹粉复合材料拉伸强度和冲击强度性能较好,较未添加SiC的PVC/竹粉复合材料分别高出29.0%,4.2%;SiC质量分数为3%时,摩擦系数、磨损失重率最小分别为0.428 5,0.151%;添加1.5%SiC的PVC/竹粉复合材料弯曲强度最高,为36.6 MPa。蠕变应力值为3.552 8 MPa时,SiC含量对PVC/竹粉木塑复合材料应变影响相近,其中,PVC/竹粉/1.5%SiC复合材料应变值最小;应力值为7.105 6 MPa、10.658 4 MPa时,PVC/竹粉/3.0%SiC复合材料应变值最小。 相似文献
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用自制球磨机对竹粉进行机械活化强化偶联改性,以改性竹粉为填充体,PVC为塑料基体,采用热压成型技术制备竹塑复合材料,以复合材料的力学性能为评价指标,探讨机械活化强化硅烷偶联改性对复合材料力学性能的影响,并采用FTIR、XRD对竹粉进行表征,通过SEM观察竹塑材料的断面形貌。结果表明,当硅烷偶联剂占竹粉用量3%、机械活化温度70℃、机械活化时间30 min时,竹粉/PVC复合材料的弯曲强度和拉伸强度分别为49.07,22.92 MPa。机械活化使竹纤维结晶度降低,反应活性提高,竹粉成功与硅烷偶联剂发生偶联反应,竹塑材料的界面相容性得到显著改善,从而提高了竹粉/PVC复合材料的力学强度。 相似文献
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《应用化工》2022,(3):460-462
用自制球磨机对竹粉进行机械活化强化偶联改性,以改性竹粉为填充体,PVC为塑料基体,采用热压成型技术制备竹塑复合材料,以复合材料的力学性能为评价指标,探讨机械活化强化硅烷偶联改性对复合材料力学性能的影响,并采用FTIR、XRD对竹粉进行表征,通过SEM观察竹塑材料的断面形貌。结果表明,当硅烷偶联剂占竹粉用量3%、机械活化温度70℃、机械活化时间30 min时,竹粉/PVC复合材料的弯曲强度和拉伸强度分别为49.07,22.92 MPa。机械活化使竹纤维结晶度降低,反应活性提高,竹粉成功与硅烷偶联剂发生偶联反应,竹塑材料的界面相容性得到显著改善,从而提高了竹粉/PVC复合材料的力学强度。 相似文献
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竹粉对微发泡聚丙烯发泡行为的影响 总被引:1,自引:1,他引:0
通过改性的竹粉,以不同含量加入到聚丙烯中,在二次开模条件下制备微发泡PP/竹粉复合材料,分析了不同含量的竹粉对微发泡复合材料发泡行为的影响规律。结果表明:随竹粉含量的增加,泡孔平均直径逐渐减小,泡孔密度逐渐增加,竹粉质量分数为7%时泡孔平均直径最小为22.3μm,泡孔密度达到2.92×107个/cm3,具有理想的发泡效果。 相似文献
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Composites of unplasticized poly(vinyl chloride) (PVC) blended with bamboo flour and pine flour, respectively, were prepared in a batch mixer followed by compression molding. The effects of wood flour fillers on the morphology, static mechanical properties, and thermal properties of the composites were investigated. Compared with neat PVC resin, the introduction of both bamboo flour and pine flour significantly improved the stiffness of the composites, while decreasing the tensile strength to some extent. Tensile tests showed that pine flour–filled composites exhibited better mechanical properties than those filled with bamboo flour with the same particle size at the same loading level. Scanning electron microscopic examination revealed good dispersion and alignment tendency of short pine fiber within the composites at a lower loading level. Moreover, experimental results indicated that both bamboo flour and pine flour additions showed no obviously adverse effect on the thermal stabilities of these composites. Based on the comprehensive properties, these composites meet the need of woodlike material for use as wood structures. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1804–1811, 2004 相似文献
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In order to improve the properties of bamboo-plastic composites (BPCs), bamboo flour/high-density polyethylene (HDPE) composites were reinforced with ultrahigh molecular weight polyethylene (UHMWPE). The effects of UHMWPE on properties of composites were studied. The crystallinity of composites decreased slightly. Compared with non-UHMWPE added bamboo powder/HDPE composite, the composite with 6 wt % UHMWPE, showed decrease in water absorption to 0.41%, whereas its tensile strength and flexural strength increased to 34.51 and 25.88 MPa, respectively, a corresponding increase of 34.59 and 12.87%. The temperatures corresponding to initial degradation temperature (Tinitial) and maximum degradation temperature (Tmax) of the composite increased from 282.7 and 467.4 °C to 288.5 and 474.7 °C respectively. Scanning electron microscopic images showed that UHMWPE was well dispersed and fully extended as long fibers in the composite, forming a “three-dimensional physically cross-linked network structure,” which contributed to the improved properties of the composites. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48971. 相似文献
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Marcus Müller Itana Radovanovic Timo Grüneberg Holger Militz Andreas Krause 《应用聚合物科学杂志》2012,125(1):308-312
Aminosilane, melamine and acetic anhydride treated wood flour were added to polyvinyl chloride (PVC) in order to process improved PVC/wood flour composites. The influence of wood treatment on water absorption and mechanical properties were evaluated. Treatments with amino-alkyl functional oligomeric siloxane and melamine in suitable concentration as well as acetylated wood flour composites showed decreased equilibrium moisture content and reduced speed of water absorption. Tensile strength, elongation at break and unnotched impact strength were considerably improved by the aminosilane treatments. The increase in strength and elongation was mainly influenced by the chemical structure and concentration of the used aminosilanes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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By using a factorial design approach, this study examined the effect of the component materials on the viscoelastic properties of PVC/wood‐flour composites. Statistical analysis was performed to determine the effects of wood‐flour content, acrylic modifier content, and plasticizer content on the die swell ratio and viscosity of the composites measured online on a conical twin‐screw extrusion capillary rheometer. The viscoelastic properties of the samples also were measured using dynamic mechanical analyzer (DMA). Wood‐flour content and acrylic modifier content were the two important variables affecting the die swell ratio, whereas the addition of a low level of plasticizer did not affect this ratio. The die swell increased with the increased acrylic modifier content, but it was reduced considerably by adding wood flour into the PVC matrix. The true viscosity of neat PVC and PVC/wood‐flour composites decreased with the plasticizer content, irrespective of the acrylic modifier content. However, the addition of acrylic modifier significantly increased the viscosity of unfilled PVC, while an opposite trend was observed for the composites, owing to the differing effect of acrylic modifier on the melt elasticity and viscosity of these materials. J. Vinyl Addit. Technol. 10:121–128, 2004. © 2004 Society of Plastics Engineers. 相似文献
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制备了可聚合非离子硼酸酯(BE)/甲基丙烯酸甲酯(MMA)/纳米碳酸钙复合材料,生产出经其改性的PVC树脂,并按管材配方混料,分析了试样的力学性能;并考察了改性PVC树脂在管材中的应用情况。结果表明:①生产BE/MMA/纳米碳酸钙复合材料的最佳工艺配比为:m(BE)∶m(MMA)∶m(纳米碳酸钙)=2∶3∶95。②BE/MMA/纳米碳酸钙复合材料的质量分数为10%时,改性PVC树脂试样的简支梁冲击强度最高。③改性PVC树脂在管材中的应用情况良好,不仅可代替普通PVC树脂,还可降低生产成本。 相似文献