硅烷改性纳米氧化锌改善竹塑复合材料的防霉性能

为改善竹粉/聚丙烯复合材料防霉性能差的缺陷,采用硅烷偶联剂改性纳米氧化锌(ZnO)接枝分散在竹粉上并与聚丙烯共混热压制备复合材料,研究硅烷改性ZnO对竹塑复合材料防霉性能、力学性能、表面微观结构的影响,结果表明,改性氧化锌对霉菌有抑制作用,随着硅烷改性ZnO添加量的增加,材料防霉能力提升,弯曲强度变化不显著,弯曲模量呈逐渐下降趋势。硅烷改性ZnO的最佳用量为3%,霉菌防治效力为87.5%,弯曲强度下降3.4%,弯曲模量下降2.1%,不具有显著差异。添加硅烷改性ZnO能够抑制霉变对复合材料表观形态的不良影响,减少霉变造成复合材料表面裂纹现象的出现。胞内蛋白质渗出量随改性ZnO浓度提高而增加表明改性ZnO改变霉菌细胞膜性质是其防霉机理。     

四针状氧化锌晶须改性硅橡胶的性能

制备了四针状氧化锌晶须（ZnOw）/硅橡胶复合材料;详尽地研究了晶须改性硅橡胶复合材料的力学性能、热稳定性及阻尼性能;通过扫描电镜观察了材料的断面以及晶须在基体中的分散性。结果表明：随氧化锌晶须填充量的增加,硅橡胶的力学性能降低,热稳定性和阻尼性能有明显的提高。当填充量为20份时,与纯硅橡胶相比,复合材料的热分解温度提高了近10 ℃,最大损耗因子提高了21%,有效阻尼温域向高温偏移了约15 ℃。     

低密度聚乙烯/改性水滑石纳米复合材料的制备、结构与性能

采用共沉淀法制备了镁铝水滑石(Mg-Al-LDHs),并以之为原料通过柱撑法制备了Zn O柱撑Mg-Al-LDHs。采用硬脂酸(SA)对其进行有机改性,得到改性水滑石(LDHs-SA),然后通过熔融插层法制备了低密度聚乙烯(LDPE)/LDHs-SA纳米复合材料。通过红外光谱分析、热分析、流变学分析、力学性能分析等对LDPE/LDHs-SA纳米复合材料的结构、性能进行了表征与分析。结果表明:当LDHs-SA的添加量为3%时,LDPE/LDHs-SA纳米复合材料的力学性能达到最优,其拉伸强度、断裂伸长率和冲击强度较之LDPE分别提高了4.4%、30.2%和13.1%。此外,LDHs-SA的加入改善了LDPE材料的热稳定性和流变性能。     

道路排水板用超疏水性聚氯乙烯复合材料的制备及性能研究

采用乙烯基三乙氧基硅烷（VTES）对纳米氧化锌颗粒进行有机改性,以聚氯乙烯为基体,通过热塑法制备复合材料,研究了不同VTES改性纳米氧化锌添加量对复合材料疏水性能、力学性能及稳定性的影响。结果表明：经过硅烷偶联剂VTES改性纳米氧化锌颗粒制备的聚氯乙烯复合材料,表现出优秀的超疏水性能和机械破坏稳定性。在VTES改性纳米氧化锌添加量为3%时,聚氯乙烯超疏水复合材料的性能达到最佳,复合材料的接触角为156°,蠕变柔量最低,应力松弛模量最高,经历1 kPa磨损、弯折等机械破坏后,接触角仍然超过150°,表现出优秀的稳定性。因此,通过3%VTES改性纳米氧化锌颗粒制备的聚氯乙烯超疏水复合材料能够用于道路排水板。     

淀粉/LDPE复合材料制备及性能研究

以低密度聚乙烯为基体树脂,淀粉为可降解改性填料,经双辊精密开炼机熔融共混制备了淀粉/低密度聚乙烯复合材料。研究了淀粉改性前后对LDPE的吸水性和力学性能的影响,以及改性淀粉量对LDPE力学性能的影响。研究结果表明:添加未改性淀粉,LDPE易吸水,力学性能损失大;添加疏水改性淀粉,LDPE与淀粉相容性好,耐水性没有明显变化;相比而言,铝酸酯改性淀粉使LDPE的力学性能损失小,三偏磷酸钠改性淀粉使LDPE的力学性能损失大。     

纳米ZnO/PP及ZnO/CaCO3/PP复合材料的性能研究

用纳米氧化锌（ZnO）与聚丙烯（PP）通过熔融共挤制得了ZnO／PP纳米复合材料．研究了ZnO／PP纳米复合材料的力学、流变学性能与纳米ZnO添加量之间的关系;同时制备了ZnO／CaCO3／PP三元纳米复合材料并对其进行了机械性能和制备成本分析。结果表明：ZnO／PP纳米复合材料的力学性能随纳米ZnO添加量的增加表现出冲击韧性先升后降,拉伸强度变化不敏感的特点;纳米CaCO3的加入不但可以降低生产成本,而且可以显著改善体系的冲击韧性;材料的拉伸破坏属于韧性断裂过程。     

纳米ZnO/PP及ZnO/CaCO_3/PP复合材料的性能研究

用纳米氧化锌(ZnO)与聚丙烯(PP)通过熔融共挤制得了ZnO/PP纳米复合材料,研究了ZnO/PP纳米复合材料的力学、流变学性能与纳米ZnO添加量之间的关系;同时制备了ZnO/CaCO3/PP三元纳米复合材料并对其进行了机械性能和制备成本分析。结果表明:ZnO/PP纳米复合材料的力学性能随纳米ZnO添加量的增加表现出冲击韧性先升后降,拉伸强度变化不敏感的特点;纳米CaCO3的加入不但可以降低生产成本,而且可以显著改善体系的冲击韧性;材料的拉伸破坏属于韧性断裂过程。     

基于纳米ZnO的混合粒子/聚氨酯复合材料的性能研究

采用原位聚合法将纳米ZnO(氧化锌)与PU(聚氨酯)进行复合,然后加入AA(丙烯酸)原位生成ZDA(丙烯酸锌),制备添加有不同比例ZnO和ZDA混合粒子的PU复合材料。考察了AA添加量对PU复合材料固化速率、力学性能、耐介质性能和动态力学性能的影响。研究结果表明:AA的加入可提高PU复合材料的固化速率、力学性能以及耐有机溶剂性能;当n(AA)∶n(ZnO)=1∶2时,其综合性能最好。随着AA添加量的增加,PU复合材料的储能模量、交联密度总体呈现下降趋势,而其玻璃化转变温度(T_g)有所提高。     

共改性煤粉增强丁苯橡胶的硫化、力学和热稳定性能研究

将硅烷偶联剂KH⁃560和硫化促进剂CZ共改性煤粉（Coal）作为增强填料加入到丁苯橡胶（SBR）中制备改性SBR/ Coal复合材料,通过设置不同的共改性Coal的添加量,寻找KH⁃560、CZ共改性Coal增强丁苯橡胶的最佳实验配比。结果表明,KH⁃560的最佳添加量为Coal质量的5 %,此时SBR/ Coal⁃KH560复合材料的力学性能最佳; KH⁃560和CZ改性Coal可以明显减少Coal团聚现象,在丁苯橡胶中均匀分散。当Coal⁃KH560⁃CZ添加量为40 %时,与纯SBR相比,拉伸强度由1.66 MPa升高至2.9 MPa,断裂伸长率由295 %升高至390 %,撕裂强度由7.1 N/mm增加至11.6 N/mm,复合材料的力学性能和热稳定性能得到改善,加工性能也得到较大提升。     

低密度聚乙烯/改性锂皂石纳米复合材料的制备及其性能

采用水热法制备出锂皂石,通过阳离子交换法对其改性制备出改性锂皂石(LAP-CTAB)。以LAP-CTAB为填料,通过熔融插层法制备了LDPE/LAP-CTAB纳米复合材料,并对其进行表征与测试。结果表明:当LAPCTAB的添加量为1%时,LDPE/LAP-CTAB纳米复合材料的力学性能达到最优,其拉伸强度、断裂伸长率和冲击强度分别提高了9.4%、54.4%和38.4%。此外,LAP-CTAB的加入提高了LDPE基纳米复合材料的热稳定性、流变性、紫外吸收性和阻燃性能。     

LDPE/PEG插层剥离改性氮化硼导热复合材料的制备及其性能

以聚乙二醇(PEG)为插层剂,通过机械球磨法制备了PEG插层剥离改性氮化硼.以低密度聚乙烯(LDPE)为基体,PEG插层剥离改性氮化硼为导热填料,采用双辊开炼、压片成型制备LDPE/PEG插层剥离改性氮化硼导热复合材料,研究了改性氮化硼用量及粒径对复合材料导热性能、力学性能和电绝缘性能的影响.结果表明:随着PEG插层剥...     

改性Sb2O3协同十溴二苯乙烷阻燃LDPE/EVA的研究

采用熔融共混法制备了阻燃低密度聚乙烯/乙烯-醋酸乙烯共聚物(LDPE/EVA)复合材料,研究了表面有机化改性三氧化二锑(Sb2O3)与十溴二苯乙烷(DBDPE)在LDPE/EVA中的阻燃协效性,通过极限氧指数(LOI)、垂直燃烧等级(UL94)、力学性能和热稳定性等测试对复合材料进行研究。结果表明,DBDPE/Sb2O3复合阻燃剂对LDPE/EVA有良好的阻燃作用,经表面有机化改性的Sb2O3,较之未改性Sb2O3阻燃协效性增强,制品热稳定性提高,对力学性能影响较小。     

LDPE/SEBS复合材料化学交联及相关性能的研究

采用二段混炼的方法,制备低密度聚乙烯/苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(LDPE/SEBS)复合材料。探究SEBS的不同含量对LDPE/SEBS力学性能的影响。通过双叔丁基过氧异丙基苯(BIBP)化学交联LDPE/SEBS,制备LDPE/SEBS/BIBP复合材料,探究LDPE/SEBS/BIBP的力学性能、微观形貌、凝胶含量、热学性能和流变性能。结果表明:SEBS用量为50份时,LDPE/SEBS具有较好的力学性能。当BIBP用量为0.9份,LDPE/SEBS/BIBP的力学性能最佳,拉伸强度为26.22 MPa,断裂伸长率为732.23%。随着BIBP用量的增加,LDPE/SEBS/BIBP的界面相容性、凝胶含量和黏度上升,熔融温度、结晶度和损耗模量下降,储能模量曲线的斜率先下降后趋于稳定。     

Comparison of the effect of carbon,halloysite and titania nanotubes on the mechanical and thermal properties of LDPE based nanocomposite films

In this study, titania nanotubes(TNTs) were prepared by hydrothermal method with the aim to compare the properties of these one-dimensional tubular nanostructures' reinforced nanocomposites with the carbon and halloysite nanotubes'(CNTs and HNTs, respectively) reinforced nanocomposites. Low density polyethylene(LDPE) was used as the matrix material. The prepared nanocomposites were characterized and compared by means of their morphological, mechanical and thermal properties. SEM results showed enhanced interfacial interaction and better dispersion of TNTs and HNTs into LDPE with the incorporation of a MAPE compatibilizer,however, these interactions seem to be absent between CNTs and LDPE, and the CNTs remained agglomerated.Contact angle measurements revealed that CNT filled nanocomposites are more hydrophilic than HNT composites, and less than TNT composites. CNTs provided better tensile strength and Young's modulus than HNT and TNT nanocomposites, a 42% increase in tensile strength and Young's modulus is achieved compared to LDPE.Tear strength improvement was noticed in the TNT composites with a value of 35.4 N·mm~(-1), compared to CNT composites with a value of 25.5 N·mm~(-1)·s~(-1). All the prepared nanocomposites are more thermally stable than neat LDPE and the best improvement in thermal stability was observed for CNT reinforced nanocomposites.CNTs depicted the best improvement in tensile and thermal properties and the MAPE compatibilizer effectiveness regarding morphological. mechanical and thermal properties was only observed for TNT and HNT systems.     

Recycled milk pouch and virgin LDPE‐LLDPE‐based jute fiber composites

The present investigation deals with the thermo‐mechanical recycling of post consumer milk pouches (LDPE‐LLDPE blend) and its use as jute fiber composite materials for engineering applications. The mechanical, thermal, morphological, and dynamic‐mechanical properties of recycled milk pouch‐based jute fiber composites with different fiber contents were evaluated and compared with those of the virgin LDPE‐LLDPE/jute fiber composites. Effect of artificial weathering on mechanical properties of different formulated composites was determined. The recycled polymer‐based jute fiber composites showed inferior mechanical properties as well as poor thermal stability compared to those observed for virgin polymer/jute fiber composites. However, the jute‐composites made with (50:50) recycled milk pouch‐virgin LDPE‐LLDPE blend as polymer matrix indicated significantly superior properties in comparison to the recycled milk pouch/jute composites. Overall mechanical performances of the recycled and virgin polymeric composites were correlated by scanning electron microscopy (SEM). The dynamic mechanical analysis showed that storage modulus values were lower for recycled LDPE‐LLDPE/jute composites compared to virgin LDPE‐LLDPE/jute composites throughout the entire temperature range, but an increase in the storage modulus was observed for recycled‐virgin LDPE‐LLDPE/jute composites. POLYM. COMPOS. 28:78–88, 2007. © 2007 Society of Plastics Engineers     

The Effect of Waste Office White Paper Content and Size on the Mechanical and Thermal Properties of Low-Density Polyethylene (LDPE) Composites

The effect of waste office white paper (WOWP) loading and size on mechanical properties, morphology and thermal properties of LDPE/WOWP composites were investigated. The results showed that increasing of WOWP loading has increased tensile strength and Young's modulus but decreased elongation at break of composites. LDPE/WOWP composites with smaller particle size (31 μm) have higher mechanical properties. Thermal analysis results of composites with particle size (31 μm) show higher thermal stability and crystallinity than composites with particle size (77 μm). Scanning electron microscope (SEM) micrograph indicates that the smaller particle size of filler has better interaction with LDPE matrix.     

Development of low density polyethylene nanocomposites films for packaging

Requirements for adequate permeability of polymeric materials to gases and vapors, good barrier and mechanical properties of polymers have boosted interest in developing new strategies to improve these properties. Research and development in polymeric materials coupled with appropriate filler, matrix-filler interaction and new formulation strategies to develop composites have potential applications in various types of packaging (agricultural produce, dried food, frozen food etc.). In this study, LDPE composites containing various types of fillers (zeolite TMAZ 7, nanoclay Cloisite 20A and precipitated calcium carbonate, CaCO₃) were prepared using extrusion/injection molding. The microstructural and morphological changes as well as mechanical features of samples were characterized by scanning electronic microscopy and by tensile tests. The thermal degradation of LDPE composites was studied using thermogravimetric analysis. Barrier properties (permeability, the diffusion and the solubility constant) in modified LDPE samples were determined. It is found that used minor clay concentration is already very effective for achievement of good morphology. In the presence of nanoparticles, at lower content, the value of oxygen permeability of LDPE decreases. Also, the results have revealed that the samples containing fillers have increased thermal stability in comparison to pure LDPE.     

天然橡胶/固相法改性纳米碳酸钙复合材料的微观形态与力学性能

研究了天然橡胶（NR）／硬脂酸包覆型纳米碳酸钙（CCR）复合材料和NR／固相法改性纳米碳酸钙（M-CCR）复合材料的微观形态、力学性能、耐老化性能和热稳定性能等。结果表明,与CCR相比,M—CCR在NR中的分散性更好,界面结合形态得到了改善;NR／M—CCR复合材料的力学性能、耐老化性能和热稳定性能显著提高,且当M—CCR用量少于10份时,NR／M—CCR复合材料的综合性能最佳。     

Effects of (conductive polypyrrole)‐modified tire dust on the mechanical,electrical, and morphology properties of (low‐density polyethylene)/(tire dust) composites

The effects of conductive polypyrrole (PPy) as a coupling agent on the mechanical properties, morphology, electrical properties, and thermal degradation of (low‐density polyethylene)/(tire dust) (LDPE/TD) composites were studied. LDPE/TD composites with different TD loadings and added PPy were prepared with a Brabender Plasticorder. The LDPE/TD_T (treated with PPy) composites showed higher values of tensile strength, modulus of elasticity, electrical conductivity, thermal stability, and swelling resistance than LDPE/TD composites. Scanning electron microscopy morphology revealed that the interfacial adhesion between the TD and LDPE phases was improved by the addition of conductive PPy. J. VINYL ADDIT. TECHNOL., 20:131–136, 2014. © 2014 Society of Plastics Engineers