Physico‐mechanical,dynamic mechanical,and swelling properties of sodium chloride filled chlorobutyl vulcanizates

The effect of addition of rigid, nonreinforcing, and noninteracting filler viz. finely ground NaCl in chlorobutyl vulcanizates on properties such as physicomechanical, dynamic mechanical, and swelling has been studied. The nonreinforcing effect of NaCl in the system was studied by Russel and Cunnenn analysis and Kraus plots. Mechanical measurements of stress and strain at the break of filled and unfilled samples showed no appreciable change in the mechanical behavior of the system. The dynamic mechanical analysis showed that there is no change at all in the glass transition temperature with addition of NaCl filler. The damping properties showed an increase with increase in filler loading because of the filler–filler friction. The swelling behavior of NaCl‐filled CIIR was studied for a period of 60 days in four different solvents of varying chemical energy potential viz. water, chloroform, acetone, and tetrahydrofuran (THF). The degree of swelling was found to increase continuously with time in water, which is a good solvent for the filler, and in THF, which is a good solvent for the polymer matrix. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 707–714, 2006     

配方因素对NBR/CSM并用胶物理性能的影响

研究NBR／氯磺化聚乙烯（CSM）并用比、硫黄用量、炭黑品种与用量、增塑剂及防老剂品种对NBR／CSM并用胶物理性能的影响。NBR／CSM并用胶优化配方为：NBR40，CSM60，炭黑N55055，氧化锌2．5，硬脂酸1，氯化石蜡10，防老剂MB1，硫黄1，促进剂TMTD0．5，促进剂CZ0．9。该配方并用胶的综合物理性能良好。     

CPVC/ABS二元共混物性能的研究

研究了ABS树脂对CPVC/ABS共混物的力学性能和加工性能的影响.结果表明随着ABS含量的增加,CPVC/ABS二元共混物的拉伸强度、维卡软化点和熔体粘度下降,而CPVC/ABS共混物的冲击强度得到明显改善;当ABS含量为30%时,共混物的冲击强度为11.0 kJ/m2,维卡软化点为110 ℃,凝胶化时间为52 s,平衡扭矩为17.7 N·m.     

Evaluation of mechanical,thermal, electrical,and transport properties of MWCNT‐filled NR/NBR blend composites

Carbon nanotube based polymer nanocomposites found versatile applications and hence studying its reinforcing effect on NR/NBR blend system is a promising step in developing flexible elastomer gadgets. In this study, attempts have been made to prepare multi‐walled carbon nanotube (MWCNT)‐filled nanocomposites of NR/NBR blends. Raman spectra and transmission electron microscopic analysis indicate that there has been a finer and uniform dispersion of carbon nanotubes within the polymer matrix. Mechanical properties like tensile strength, tear resistance, abrasion loss and compression set of pure and blend samples showed an improvement with the increase in the dosage of MWCNT from 0.5 to 4 phr. 70/30 NR/NBR blend with 4 phr of MWCNT showed an improvement of 83% in tensile strength and 72% in tear strength compared to pure NBR. This is attributed to the uniform dispersion, high surface area, nano level interaction, and compatibility of MWCNT with the polymeric molecular chains. MWCNT is acting as a compatibilizing agent as is manifest from the increased negative values of free energy. Electrical conduction and thermal stability of the mixes were increased with the concentration of MWCNT due to the increase in the interfacial interaction resulting from the pi‐pi interaction with the nanotubes. POLYM. ENG. SCI., 58:961–972, 2018. © 2017 Society of Plastics Engineers     

NBR/EPVC共混物的性能研究

研究NBR／聚氯乙烯糊树脂(EPVC)常温共混物的物理性能及耐热老化性能，并与NBR／硬质聚氯乙烯(SPVC)高温共混物进行对比，结果表明，加入EPVC可提高NBR的耐热老化性能；与NBR／SPVC高温共混物相比，NBR／EPVc常温共混物的300%定伸应力、拉伸强度和撕裂强度增大，耐热老化性能提高，耐臭氧老化性能相当，且共混工艺简单，可节约能源和降低混炼成本。     

三元尼龙对丁腈橡胶力学性能及耐介质性的影响

采用三元尼龙改性丁腈橡胶（NBR）,研究尼龙用量对NBR混炼胶加工工艺性能和硫化胶力学性能、耐老化性能、耐介质性能的影响。结果表明：尼龙的添加有效地提高了NBR硫化胶的强度以及耐磨性能,老化性能也得到改善,拉伸强度基本上是随着尼龙用量的增加而增大,其中尼龙用量为5phr时,硫化胶的综合物理机械性能较好;耐油系数亦随阻尼用量的增加而逐渐增大,尼龙的加入提高了硫化胶的耐热油性;耐混合溶剂后的体积变化率随着尼龙用量的增加而逐渐降低。     

NR/NBR/环氧化天然橡胶共混物的动态力学性能

研究了对叔丁基酚醛树脂用量对NR／NBR／环氧化天然橡胶（ENR）共混物动态力学性能的影响。加对叔丁基酚醛树酯的NR／NBR／ENR共混物有2个动态力学损耗峰（分别对应共混物的玻璃化转变温度Tg1和Tg2）。随着对叔丁基酚醛树脂用量（0－15份）增大,共混物的Tg1基本不变,Tg2则逐渐升高;温度为Tg1的共混物损耗因子（tanδ）峰值化不大,温度为Tg2的共混物tanδ峰值则逐渐增大。通过调节对叔丁基酚醛树脂用量可以改变共混物在0和65℃附近的tanδ值,从而获得抗湿滑性能好、滚动损失小的新型胎面材料。     

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。     

丁腈橡胶与丁苯橡胶共混胶的性能研究

该文研究了丁腈橡胶与丁苯橡胶并用胶的性能,探讨了用丁苯橡胶替代部分丁腈橡胶的可能性。结果表明,丁腈橡胶中添加一定量丁苯橡胶对力学性能并没有太大的影响,在某些方面还有提高。对耐油性要求高的橡胶制品,可以少量加入丁苯橡胶,对耐油性影响不大,并可降低成本。对胶料进行了动态热机械分析（DMA）试验,通过对tgδ-温度图分析得出,加入丁苯橡胶可以改善丁腈橡胶的耐疲劳性。但是抗蠕变性下降。     

丁腈橡胶／氯化丁基橡胶共混物的性能研究

研究了丁腈橡胶／氯化丁基橡胶共混物的低温性能和耐热性能。结果表明．选用TMTD／CZ／ZnO作共硫化体系,共混物体系两相的相容性较好;在并用比例为70／30时,与纯NBR相比,共混物Tg下降5.5℃,失重5％热分解温度提高38.4℃,且耐油性变化很小,适宜制备高低温性能较好的耐油橡胶制品。     

NBR/PVC乳液共沉合金的制备与性能

丁腈橡胶（NBR）与聚氯乙烯（PVC）共混合金是橡塑共混体系中一类重要的共混体系,NBR和PVC都属于极性聚合物,在共混过程中,相容性较好,因此这种体系被广为研究和应用。但此方法是选用粉末丁腈胶直接加入PVC中进行混炼共混,仍然存在共混不均匀的问题。本实验用乳液共混凝聚法制备了NBR/PVC共沉胶,研究了共沉工艺条件、丁腈胶种类与性能对NBR/PVC合金性能影响。     

NBR丙烯腈含量对NR/BR/NBR并用胶性能的影响

讨论NBR丙烯腈含量对NR／BR／NBR并用胶加工性能、物理性能和动态力学性能的影响。试验结果表明，用少量(5份)丙烯腈质量分数较大(0．35)的NBR等量替代NR／BR并用体系中的NR，并用胶0℃C时的tanδ值增大，耐热老化性能提高，65℃时的tanδ值和物理性能变化较小，加工性能稍有降低。NR、BR和少量丙烯腈含量较大的NBR并用，可以获得抗湿滑性能较好、滚动阻力较小且性价比较理想的胎面胶。     

Physico‐mechanical and decay resistance properties of chemically modified tropical wood material

In this present research, several kinds of selected tropical light hardwoods were chemically modified with benzene diazonium salt to improve their physico‐mechanical and decay resistance properties. Benzene diazonium salt underwent a coupling reaction with wood which was confirmed through fourier transform infrared spectroscopic analysis. The compressive modulus of the treated wood increased, whereas modulus of rupture was shown to decrease on treatment. Water absorption was also found to decrease considerably after modification. The modified wood samples had higher hardness (Shore D) value compared to that of the control ones. The wood was exposed to two types of fungi; white‐rot (Polyporus versicolor) and brown‐rot (Postia placenta), for 12 weeks and then decay was assessed through weight loss percentage (%). A significant improvement was found in the modified wood compared to the control wood. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

NR/BR/NBR并用胶的结构与性能

研究了NR／BR／NBR并用胶的结构与性能。透射电子显微镜分析显示，随着NBR用量的增大，炭黑的分散趋于均匀；NR／BR／NBR并用胶出现两个玻璃化温度，在O℃时的tanδ值增幅较大，而在65和80℃时的tanδ值变化不大；并用胶物理性能变化不大。通过调节NBR用量可获得抗湿滑性能较好、滚动阻力和生热小的胎面胶。     

Physico‐mechanical properties of nano‐polystyrene‐decorated graphene oxide–epoxy composites

Nano‐polystyrene (nPS)‐decorated graphene oxide (GO) hybrid nanostructures were successfully synthesized using stepwise microemulsion polymerization, and characterized using Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), field‐emission scanning electron microscopy and transmission electron microscopy. XRD and FTIR spectra revealed the existence of a strong interaction between nPS and GO, which implied that the polymer chains were successfully grafted onto the surface of the GO. The nPS‐decorated GO hybrid nanostructures were compounded with epoxy using a hand lay‐up technique, and the effect of the nPS‐decorated GO on the mechanical, thermal and surface morphological properties of the epoxy matrix was investigated using a universal tensile machine, Izod impact tester, thermogravimetric analysis and contact angle measurements with a goniometer. It was observed that in the epoxy matrix, GO improved the compatibility. © 2017 Society of Chemical Industry     

HNBR/NBR共混物的硫化及热空气老化性能

采用5种硫化体系制备了HNBR／NBR（质量比75／25）的混炼胶,研究了硫化体系对其力学性能的影响和不同热空气老化 度下的老化行为及其差异成因,结果表明：S／TMTD／M／CBS（0．5／2．5／0．5／0．5,质量比,下同）是快速安全的硫化体系,可获得中高程度耐热胶料;DCP／TAIC（7．0／1．5）体系制得的HNBR／NBR硫化胶的耐热老化性能接近HNBR。     

超细全硫化粉末NBR/EPDM共混物的结构与性能

试验研究超细全硫化粉末NBR（UFPNBR）／EPDM共混物的硫化特性、相态结构、动态力学性能，加工性能及物理性能。UFPNBR粒子加入EPDM中明显影响了EPDM的硫化性能，UFPNBR／EPDM共混物采用过氧化物硫化体系硫化效果较好；透射电子显微镜和扫描电子显微镜观察表明，UFPNBR粒子在UFPNBR／EPDM共混物中始终为分散相，但在EPDM基体中没有分散成预期的纳米尺寸；动态力学热分析结果显示，共混物存在两个玻璃化温度，呈两相结构且界面结合较弱；橡胶加工分析仪分析结果表明，UFPNBR粒子在EPDM基体中形成了填料网络结构，使共混物的流动性能变差；UFPNBR对EPDM有一定补强作用，但补强作用不如传统的纳米无机填料。     

ECO/NBR共混胶的性能

考察二元共聚氯醚橡胶(ECO)与不同丙烯腈质量分数的NBR共混胶的物理性能、耐老化性能及耐油性能。结果表明，共混胶的物理性能提高，ECO／NBR-4l共混胶的耐热老化性能优于ECO／NBR-35和ECO／NBR-26共混胶．NBR-4l的耐油性能最好。共混比为60／40的ECO／NBR-4l共混物具有优异的耐油性能，玻璃化温度范围为-46～-43℃，可满足耐寒制品的使用要求。     

NBR/AEM并用比例对胶料性能的影响

本文主要研究了NBR/AEM不同井用比例对共混胶料的硫化性能、力学性能、耐老化性能和耐油性能的影响,结果表明;随着AEM含量的增加,NBR/AEM胶料的焦烧时间延长,硫化速度降低.并用硫化胶的拉伸强度、撕裂强度和压缩永久变形都逐渐减小,拉断伸长率先减小后增加,硬度和100％定伸应力先增大后减小,耐老化性能得到改善,耐油性能下降.     

高聚合度PVC与丁腈橡胶共混物的微观结构

采用分子模拟方法,研究了高聚合度聚氯乙烯(HPVC)链单元和丁腈橡胶(NBR)中的丙烯腈单元的结构尺寸、电荷分布以及HPVC/NBR共混物的微观结构。结果发现,HPVC链单元与NBR中丙烯腈单元的结构尺寸、电荷分布基本相似,这是NBR与PVC相容性较好的内在原因;NBR在共混物中的形态随着其用量的增加由分散相变为连续相,共混物经剪切后出现明显的层状结构。