PVC/TPU/NBR三元共混物的制备及性能研究

对PVC／热塑性聚氨酯（TPU）／SR三元共混物的性能进行研究，重点讨论NBR品种、TPU／NBR并用比、PVC聚合度、增塑剂DOP和硫化剂DCP用量对PVC／TPU／NBR三元共混物性能的影响。结果表明。PVC／TPU／NBR-3604三元共混物的物理性能较优；PVC／TPU／NBR-3604三元共混物的拉断伸长率和拉断永久变形均随着PVC聚合度的增大基本呈上升趋势；随着增塑剂DOP用量的增大，共混物的邵尔A型硬度、拉伸强度、撕裂强度和拉断永久变形均基本呈下降趋势，拉断伸长率增大；随着硫化剂DCP用量的增大。共混物的拉伸强度和拉断伸长率变化不大，撕裂强度基本呈逐渐减小的趋势。不同PVC／TPU／SR三元共混物的扫描电子显微镜照片表明，NBR与PVC和TPU的相容性较好。     

NBR/PVC共混物的共混工艺和性能

介绍NBR／PVC共混物的共混工艺和性能。NBR／PVC共混物共混工艺主要有乳液共沉法和机械共混法，其中乳液共沉法共混物性能较好，机械共混法操作简单、成本较低。影响共混物性能的因素主要有NBR的门尼粘度和丙烯腈含量、PVC品种、NBR／PVC共混比、共混温度以及PVC在共混物中的分散程度等。     

NBR/PVC/OMMT纳米复合材料的结构与性能研究

采用乳液共沉法和直接混炼法制备NBR/PVC/有机蒙脱土（OMMT）纳米复合材料,研究纳米复合材料的硫化特性、微观结构、动态力学性能和热稳定性.结果表明,OMMT能够显著促进NBR的硫化反应,使NBR/PVC/OMMT纳米复合材料的焦烧时间和正硫化时间明显缩短;乳液共沉法和直接混炼法NBR/PVC/OMMT纳米复合材料是插层型纳米复合材料,乳液共沉法NBR/PVC/OMMT纳米复合材料中的OMMT分散更为均匀,其储能模量、玻璃化温度和热分解温度均高于NBR/PVC共混物和直接混炼法NBR/PVC/OMMT纳米复合材料,具有较好的动态力学性能和热稳定性.     

NBR／PVC共混胶的应用

概述了NBR/PVC共混胶国内外发展现状,并介绍了NBR/PVC在电线电缆、胶管、密封条、胶辊、鞋底、泡沫等方面的应用。     

NBR/PVC泡沫弹性体的研制

以NBR/PVC并用胶为主要原料 ,在化学发泡剂的作用下进行自由发泡制备密度低于 0 15Mg·m- 3的闭孔泡沫弹性体。利用正交设计得到试验条件下的最佳配方为 :NBR/PVC　 70 /30 ,硫黄　 0 8,促进剂EZ　 1 5 ,促进剂D　 0 5 ,发泡剂AC　 12 ,填料、增塑剂　适量 ;最佳发泡工艺条件为 :混炼胶在 110～ 130℃下预处理 10～ 30min ,在160℃左右自由发泡。     

户外风机内嵌骨架PVC/NBR防护罩的研制

介绍户外风机内嵌骨架ＰＶＣ／ＮＢＲ 防护罩的结构、材料配方和模具设计。主体材料选用丁腈胶和ＰＶＣ 并用,骨架材料选用１－５ ｍ ｍ 厚的钢板加工,应用证实该材料耐老化性能好,与金属制品相比,不会生锈。     

PVC／POM／NBR三元共混弹性体的研究

采用高温机械共混、化学交联工艺制备PVC/POM/NBR三元共混弹性体。重点讨论了PVC/POM/NBR共混比、PVC树脂的分子量、NBR橡胶的丙烯腈含量、硫化体系等因素对共混弹性体性能的影响。结果表明,PVC/POM/NBR（20/10/70）三元共混弹性体具有优异的物理机械性能和耐油耐溶剂性能。用动态粘弹谱仪和扫描电子显微镜等现代分析技术研究其微观结构,结果显示PVC/POM/NBR（20/10/70）三元共混弹性体的tgδ-T谱上只出一个峰值,其对应的玻璃化转变温度为 3.7℃,表现出较好的相容性。     

NBR/PVC抗静电纺织胶辊的研制

探讨了NBR/PVC抗静电纺织胶辊的配方设计和生产工艺，试验得出，主体材料采用并用比为60/40的NBR/PVC并用体系和导电填料采用并用比为20/40的乙炔炭黑/高耐磨炭黑并用体系制备的抗静电纺织胶辊抗静电和抗臭氧龟裂性能好。生产工艺简单，成本较低。     

NBR/PVC共混胶的结构与性能

采用机械共混法和乳液共沉法制备了NBR/PVC共混胶,通过差示扫描量热仪(DSC)和场发射扫描电子显微镜(FE-SEM)对共混胶的微观形貌、结构进行了表征,考察了共混方式和共混胶配比对其力学性能的影响,并比较了共混胶、CPE、P-83对硬质/软质PVC的改性效果。结果表明:①与机械共混胶相比,乳液共沉胶混合得更均匀,分散性更好,其分子级混合程度更好;②乳液共沉胶试样的力学性能在总体上优于机械共混胶;③对于硬质PVC,CPE的改性效果优于其他改性剂;④对于软质PVC,乳液共沉胶的改性效果最好,特别是对撕裂强度的提高非常明显。     

Irradiation Modification of PVC/NBR Blend

Electron beam initiated cross-linking on the 50/50 poly(vinyl chloride), PVC/acrylonitrile butadiene rubber, NBR blend was studied in the absence and presence of 4 phr trimethylolpropane triacrylate (TMPTA). The 50/50 NBR/PVC blend was prepared by mixing in a Brabender Plasticoder at 170°C. The blend was then irradiated by using a 3.0 MeV electron beam machine at doses ranging from 0 to 200 kGy in air and room temperature. The changes in gel fraction, tensile strength, hardness, impact strength, scanning electron micrographs and dynamic mechanical properties of the samples were investigated. The gel fraction results indicate that under the irradiation conditions employed, the PVC/NBR blend cross-linked by electron beam irradiation. The addition of TMPTA was found to be effective in the acceleration of the radiation-induced cross-linking. Gradual increases in mechanical properties with irradiation dose were observed before exhibiting a decline due to embrittlement as a consequence of excessive cross-linking at higher irradiation doses. The gradual changeover from ductile to brittle fracture due to the irradiation-induced cross-linking was evident from the SEM examination The increase in the storage modulus and T_g as well as the reduction in the damping peak with the increase in irradiation dose reveal that the enhancement in mechanical properties of NBR/PVC blends upon irradiation is due to the irradiation-induced cross-linking, as well as the improved interaction between NBR and PVC.     

NBR／PVC共混胶在燃油胶管中的应用

探讨了德国拜耳公司乳液共沉法生产的NBR/PVC共混胶料填充各种常用配合剂后的物理性能的变化,介绍了NBR/PVC共混胶在耐燃油胶管中的应用配方和制造工艺。     

NBR/PVC摩托车橡胶护套的研制

介绍了摩托车用NBR／PVC橡胶护套的研制。针对该产品的使用条件和技术要求，阐述了配方设计特点和生产工艺要点。产品性能完全符合用户要求。     

沥青炭基C/C复合材料的载流摩擦磨损性能

通过对纯沥青炭基C/C复合材料、含炭黑沥青炭基C/C复合材料和添加氯化铁的沥青炭基C/C复合材料的载流摩擦磨损实验,发现含炭黑沥青炭基C/C复合材料的摩擦系数和磨损量最大,纯沥青炭基C/C复合材料的摩擦系数和磨损量次之,添加氯化铁的沥青炭基C/C复合材料的摩擦系数和磨损量最小,并对3种沥青炭基C/C复合材料的摩擦磨损机理进行了讨论。     

机械混炼法OMMT/PVC/NBR纳米复合材料的结构与性能

分别采用3种不同的机械混炼法制备了有机蒙脱土(OMMT)/PVC/NBR纳米复合材料,并对其结构和性能进行表征.结果表明:采用将NBR与OMMT预混再与PVC混合的方法制备的纳米复合材料具有最佳的物理性能;当OMMT用量较小时,复合材料的物理性能随OMMT用量的增大而增大;所制得的纳米复合材料为插层型纳米复合材料.     

填料对PVC/NBR热塑性弹性体性能的影响

通过试验比较分析了几种不同填料对PVC/NBR热塑性弹性体拉伸性能、压缩永久变形性能的影响。结果表明:滑石粉类填料填充的PVC/NBR热塑性弹性体,其拉伸强度优于碳酸钙类填料填充的弹性体,断裂伸长率低于碳酸钙类填料填充的弹性体;采用填料填充的弹性体,其压缩永久变形率均大于未填充弹性体,且以5μm滑石粉为填料时,材料的压缩永久变形率提高最少。     

NBR/PVC低硬度高速印刷胶辊的研制

介绍NBR／PVC低硬度高速印刷胶辊的配方设计和生产工艺。胶辊的主体材料为并用比65／35的NBR／PVC并用体系，硫化体系为低硫高促硫化体系，增塑体系以增塑剂DOP为主且用量较大。胶料在开炼机上混炼，胶辊在卧式硫化罐中硫化。低硬度高速印刷胶辊硫化胶性能与国外同类产品硫化胶性能基本相当，并达到HG2287—2001标准优等品水平。     

A new proposed model for dielectric behavior of PVC/rice husk composites

Ecofriendly materials are becoming a need of the day. We have severe setback when there is lot of use of agro wastes in plastics. To reduce pure plastic use in agriculture, this study has been made to find some remedial measure. In the process, we sought the effect of addition of rice husk (RH) in polyvinylchloride (PVC) on the dielectric properties at different frequency and temperature has been studied. Measurements have been performed in the frequency range from 1 to 10 kHz and temperature range of 32–80°C. The experimental results show that dielectric constant (ε′) increases with the addition of RH in PVC. Dielectric constant (ε′) decreases with increasing frequency, which indicates that the major contribution to the polarization comes from orientation polarization. Dielectric constant (ε′) increases with increasing temperature due to greater freedom of movement of dipoles within PVC at higher temperatures. A theoretical model for dielectric constant with temperature and frequency dependent is proposed. Experimental results are in good agreement with the proposed theoretical model. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

动态硫化NBR/PVC共混物性能的研究

介绍了以丁腈橡胶为主体材料,采用动态硫化法制备共混热塑性弹性体的方法,考查了橡塑比、动态硫化温度、填料用量等因素对热塑性弹性体力学性能的影响,研究了加入不同量白炭黑所得TPV的微观相态结构.     

Friction and wear properties of basalt fiber reinforced/solid lubricants filled polyimide composites under different sliding conditions

Short basalt fibers (BFs)‐reinforced polyimide (PI) composites filled with MoS₂ and graphite were fabricated by means of hot‐press molding technique. The tribological properties of the resulting composites sliding against GCr15 steel ring were investigated on a model ring‐on‐block test rig. The wear mechanisms were also comparatively discussed, based on scanning electron microscopic examination of the worn surface of the PI composites and the transfer film formed on the counterpart. Experimental results revealed that MoS₂ and graphite as fillers significantly improved the wear resistance of the BFs‐reinforced polyimide (BFs/PI) composites. For the best combination of friction coefficient and wear rate, the optimal volume content of MoS₂ and graphite in the composites appears to be 40 and 35%, respectively. It was also found that the tribological properties of the filled BFs/PI composites were closely related with the sliding conditions such as sliding speed and applied load. Research results show that the BF/PI composites exhibited better tribological properties under higher PV product. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

第三组分PCR对NBR／PVC共混胶性能的影响

将PCR（PE／CR=30／70）作为第三组分加入NBR/PVC共混体系中,能促使炭黑等配合剂快速均匀地分散,提高了混炼胶综合物理机械性能;阐述了PCR对NBR／PVC的共混相容性机理、共混过程中吃粉速度及对硫化胶性能的影响等。结果表明,PCR在合适的用量时,混炼胶吃炭黑时间比没加PCR时减少了一倍多,硫化胶拉伸强度、扯断伸长率、阿克隆磨耗以及与金属粘着强度等提高幅度均较大。