硅灰石/硬脂酸稀土改性PVC-U给水管材的研究

将硅灰石经硬脂酸稀土改性后,用于填充PVC-U给水管材,并对管材性能进行分析,结果表明:改性硅灰石可以提高管材的落锤冲击强度及拉伸强度,且硅灰石粒径越小,提高越显著。当粒径在3μm左右的硅灰石,质量份数为25时,落锤冲击强度达到1%。同时还使管材的维卡软化温度提高到92.4℃,纵向回缩率降低至1.03%。     

眭灰石腰脂酸稀土改性PVC-U给水管材的研究

将硅灰石经硬脂酸稀土改性后,用于填充PVC-U给水管材,井对管材性能进行分析,结果表明：改性硅灰石可以提高管材的落锤冲击强度及拉伸强度,且硅灰石粒径越小,提高越显著。当粒径在3μm左右的硅灰石,质量份数为25时,落锤冲击强度达到1％。同时还使管材的维卡软化温度提高到92.4℃,纵向回缩率降低至1.03％。     

硅灰石/硬脂酸稀土改性PVC-U给水管材的研究

将硅灰石经硬脂酸稀土改性后,用于填充PVC-U给水管材,并对管材性能进行分析,结果表明:改性硅灰石可以提高管材的落锤冲击强度及拉伸强度,且硅灰石细度越细,提高越显著.当粒径在3μm左右的硅灰石,质量份数为25时,落锤冲击强度达到1%.同时还使管材的维卡软化温度提高到92.4℃,纵向回缩率降低壁1.03%.     

矿物形态对聚丙烯复合材料性能的影响

采用熔融共混法制备了聚丙烯（PP）/矿物填料复合材料,考察了云母与硅灰石粒径及其组合填充对复合材料力学及流动性能的影响。结果表明,PP/硅灰石复合材料的拉伸与弯曲强度、模量均随着硅灰石粒径的增大而下降,而复合材料的断裂伸长率随着硅灰石粒径增大而增大,缺口冲击强度随着粒径增大先减小后增大。当硅灰石的累计粒度分布百分数达到90%时的粒径(D₉₀)为8.72 μm时,复合材料的弯曲强度、拉伸及弯曲弹性模量与缺口冲击强度分别较纯PP提高了7.77%,119.0%,100.4%与17.46%。PP/云母复合材料的拉伸与弯曲强度随着云母粒径的增大先下降后上升,断裂伸长率、缺口冲击强度与熔体流动速率随着云母粒径增大而下降,复合材料的拉伸与弯曲弹性模量随云母粒径的增大而增大。当云母的D₉₀为60.09 μm时,复合材料的弯曲强度、拉伸及弯曲弹性模量与缺口冲击强度分别较纯PP提高了10.43%,177.6%,172.8%与17.46%。硅灰石与云母组合填充PP的力学及加工性能基本介于单独填充硅灰石与云母所得到的复合材料性能之间,两者组合填充不能产生协同效应。     

硅灰石填充改性硬质聚氯乙烯的研究

考察了两种硅灰石刚性粒子填充硬聚氯乙烯的力学性能。结果表明，在一定的填充量范围内，两种硅灰石都能提高PVC的冲击强度，硅灰石粒子表面包覆了聚甲基丙烯酸甲酯改性处理后，对基体树脂的力学性能改善明显，尤其是小粒径的改性硅灰石刚性粒子改进更大。另外，还结合电子显微镜观察对共混体系的增韧机理进行了讨论。     

硅灰石对PP力学性能的影响

考察了两种硅灰石填充聚丙烯的力学性能。结果表明，在一定的填充量范围内，两种硅灰石都能提高聚丙烯的冲击强度，硅灰石填充材料表面以适当的偶联剂进行改性处理后，对聚丙烯的增韧效果量明显。随硅灰石填充量的增加，硅灰石填充聚丙烯材料的拉伸强度稍有下降。     

硅灰石在不饱和聚酯树脂中的应用

对针状硅灰石（L：D≥10，325目及800目）提纯后，采用硅烷偶联剂进行表面处理，用活化指数对改性效果进行评价，确定了偶联剂的最佳用量，将硅灰石按不同比例填充于不饱和聚酯树脂体系中，研究了材料的性能，比较了不同粒径硅灰石对材料性能的改善效果。结果表明：改性后的硅灰石可显著改善不饱和聚酯的性能。800目硅灰石比325目硅灰石对不饱和聚酯树脂的性能改善效果更好。当800目硅灰石的添加量在30％－40％之间时，硅灰石填充不饱和聚酯复合体系经基体树脂的拉伸强度增加1．95倍，弯曲强度增加1．47倍。     

机械力化学改性硅灰石/聚丙烯性能的研究

利用气流磨对硅灰石进行机械力化学改性，并用IR分析对改性效果进行了预评价；对比了用改性前后的硅灰石填充聚丙烯(PP)的性能。结果表明：改性后硅灰石分别为由亲水疏油性变为亲油疏水性；硬脂酸质量分数为1．5％时，改性硅灰石／PP复合材料的拉伸强度和冲击强度最好。     

表面改性硅灰石增韧环氧树脂的研究

采用硬脂酸和两种硅烷偶联剂分别对硅灰石进行了表面改性,研究了不同改性剂的改性效果及不同用量的改性硅灰石对环氧树脂复合材料力学性能的影响;并对硅灰石增韧环氧树脂复合材料冲击断面形貌进行了分析。结果表明:硬脂酸改性硅灰石的改性效果最好,其改性表面接触角最大可达140°,与环氧树脂的相容性得到改善,复合材料的韧性明显提高。当硬脂酸改性硅灰石用量为环氧树脂质量的10%时,拉伸强度提高47.79%,冲击强度提高47.95%。     

硅灰石填充改性尼龙66的研究

研究了针状硅灰石粉填充对尼龙66的结构和性能的影响。研究表明,随着硅灰石填充量的增加,材料的冲击强度大幅度地提高,拉伸强度、弯曲强度则较为复杂,且复合材料的耐热性能、尺寸稳定性得到了很大的提高;随着硅灰石细度的增加,硅灰石增强尼龙66的缺口冲击强度、拉伸强度、弯曲强度均增加;将硅灰石填充材料表面以适量的偶联剂进行改性处理后,借助于扫描电子显微镜,并结合硅灰石粉的微观形态及偶联剂的作用原理,探讨了针状硅灰石粉对尼龙66力学性能的影响。     

端脂肪氨基聚醚改性环氧树脂的性能研究

用自制的一种既含聚醚柔性链段又含苯脂肪氨基刚性链段的端脂肪氨基聚醚(APPEG)作为固化剂对环氧树脂进行增韧改性。扫描电子显微镜和力学性能测试结果表明,固化剂对环氧树脂具有明显的增强、增韧效果,且改性的环氧树脂胶粘剂具有很好的填充性能,填充比高达50%。与羰基铁粉组成的涂层材料具有优异的力学性能和热稳定性能。     

硅灰石及氢氧化铝改性EVA/PP共混物复合材料性能研究

本文通过试验，讨论了以EVA／PP共混物为基体材料、硅灰石为填料对复合材料性能的影响。为了使复合材料同时具有良好综合力学性能和一定阻燃性能，本文还研究了硅灰石与氢氧化铝（ATH）配合填充树脂对复合材料性能的影响。通过对拉伸、阻燃性能及微观结构的测试，讨论分析填料对复合材料性能的影响，最终得出一种最佳的复合材料与填料配比。     

聚丙烯透明成核剂的开发与进展

综述了国内外聚丙烯成核荆的发展状况，介绍了聚丙烯成核剂的种类、产品、新品种和最新研制进展，提出了今后的发展方向。     

Mechanical properties of (surface‐modified potassium polytitanate small additives)/epoxy composite materials

The article presents research on the mechanical properties of epoxy resin modified with potassium polytitanate small additives. The influence of the surface modification of potassium polytitanate particles on their properties and interaction with epoxy resins and the mechanical properties of the resulting composite were investigated. The interactions among the dressing additives, binders and fillers were determined. The study shows the dependence of properties of composite materials on the content of dressing additives and method of filling with potassium polytitanate. This study also highlights possible reasons for variation in the mechanical properties of epoxy resin filled with potassium polytitanate particles. POLYM. ENG. SCI., 54:2866–2871, 2014. © 2014 Society of Plastics Engineers     

环氧树脂聚酰胺网络体系性能研究

用红外光谱法表征了4种聚酰胺固化剂与环氧树脂按等当量配比,在一定条件下的固化反应过程。DSC法测定了其固化反应活性。桐马聚酰胺/环氧树脂固化体系较聚酰胺650/环氧树脂固化体系的固化活性大大提高,同时测定了该固化产物的热失重(TG)及玻璃化温度(Tg),对该固化物的热稳定性进行了评价,还测定了不同固化时间的剪切强度以研究其动态力学性能,从浇铸体的冲击强度方面比较其韧性。综合比较分析了聚酰胺固化剂与环氧树脂固化体系的力学性能、耐热性、电绝缘性等。结果表明:桐马聚酰胺Ⅲ型固化剂具有黏度低、粘接强度大、耐热性好、力学性能优等优点。     

The investigation of melamine polyphosphate flame retardant polyamide‐6/inorganic siliciferous filler with different geometrical form

Melamine polyphosphate (MpolyP) was used to flame retard polyamide‐6 filled with siliciferous fillers including fibrous wollastonite, laminar talc, and spherical glass bead. The mechanical performance, flame retardancy of these flame retarded materials, and the influence of these fillers on charring behavior were investigated. The results show that wollastonite/MpolyP/PA6 system has the best mechanical properties as compared with talc/MpolyP/PA6 and glass bead/MpolyP/PA6 system due to good reinforcing effects of the fibrous filler in resin matrix. Otherwise, the char morphology observation shows that spherical glass beads separates from the char matrix during the expansion of the char layer, which hardly improves the char quality. However, fibrous wollastonite and laminar talc can well combine with the char layer, thus enhancing the flame retardancy as a part of the charred layer. It is proved that the laminar talc favors the formation of more condensed char because of its barrier effects, and the fibrous wollastonite with quite high aspect ratio can effectively reinforce both the resin and the charred layer, which leads to the remarkable improvement of the flame retardancy. Consequently, polyamide‐6/MpolyP/wollastonite system shows the best flame retardancy among the above systems. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

端氨基丁腈橡胶增韧环氧树脂性能研究

采用端氨基液体丁腈橡胶（ATBN）对环氧树脂（EP）/聚醚胺（D230）体系进行增韧研究,探究了ATBN的加入对树脂体系凝胶时间、力学性能、断面微观形貌、耐热性能的影响。结果表明,当ATBN的含量为15份（质量份,下同）时,增韧效果最为明显,EP/D230/ATBN体系的冲击强度比未增韧的体系提高了65 %,弯曲强度提高了14 %,拉伸剪切强度提高了73 %。     

Mechanical properties and processibilty of glass‐fiber‐, wollastonite‐, and fluoro‐rubber‐reinforced silicone rubber composites

The reinforcement of silicone rubber (SR) imparted by different types of fillers was investigated. Glass fiber (GF), wollastonite and fluoro rubber (FR) as nontraditional filler for rubber were compounded SR and mechanical properties of the prepared composites were evaluated. The addition of silane pretreated GF and wollastonite into SR, tensile strength, abrasion resistance and tear strength of the composites improved considerably. The improvement in the properties was assigned to an increased interaction between the filler and the polymer matrix. For the SR/FR composites system, the elongation at break was increase with increasing concentrations of FR due to sponge like structure resulting from poor compatibility between the two components. To investigate the production potential of extrusion processing method, prepared composites were extruded in a rod type sample. During the curing stage, GF, wollastonite and FR lead to the formation of void in the matrix resin. When GF and wollastonite were treated with silane, the void formations were reduced significantly. The silane treatment process improves not only mechanical strength but also processibility of SR composites in dry conditions. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

纳米SiO_2改性环氧树脂胶粘剂的研究

选择纳米 SiO_2 作为增强材料改性环氧树脂基体, 以物理分散法将纳米 SiO_2 分散在环氧树脂中。通过力学性能测试和热稳定性能测试, 研究了不同含量的纳米 SiO_2 对改性环氧树脂胶粘剂的热性能、拉伸性能和冲击性能的影响; 通过 NOL环测试和扫描电子显微镜(SEM) 分析, 研究了不同含量的纳米 SiO_2 对国产芳纶纤维/改性环氧复合材料的界面性能和层间剪切强度的影响。实验结果表明, 基体树脂中当 w( 纳米SiO_2)=3%时, 改性环氧树脂胶粘剂的拉伸强度和冲击强度分别提高了 28.8%和 22.6%, 复合材料的层间剪切强度(ILSS) 达到最大值, 比未改性胶粘剂提高约 56.8%。