BR/EVA TPV的制备及性能研究

采用动态硫化法制备BR/乙烯-乙酸乙烯酯共聚物(EVA)热塑性硫化胶(TPV),并对其性能进行研究.结果表明:当BR/EVA共混比大于50/50时,TPV呈现出典型弹性体的应力-应变行为;当BR/EVA共混比为50/50～65/35时,TPV的硬度较低,综合物理性能良好;当BR/EVA共混比为60/40时,微米级的BR粒状物均匀分散在EVA基体中,两相界面结合良好.     

SBR/HIPS TPV的制备及性能研究

采用动态硫化法制备SBR/高抗冲聚苯乙烯(HIPS)热塑性硫化胶(TPV),并对其性能进行研究.结果表明,当SBR/HIPS共混比大于60/40时,SBR/HIPS TPV呈现出典型的弹性体应力-应变行为;当SBR/HIPS共混比为60/40～70/30时,SBR/HIPS TPV的硬度适中,综合物理性能良好.扫描电子显微镜分析表明,SBR以带状形貌均匀分散在HPS基体中,两相界面结合良好.     

BR/EVA/HIPS TPV的制备和性能研究

采用苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改善BR/乙烯-乙酸乙烯酯共聚物(EVA)/高抗冲聚苯乙烯(HIPS)共混物的界面相容性,通过动态硫化法制备BR/EVA/HIPS TPV,并对其性能进行研究.结果表明:未加入SBS的BR/EVA/HIPS共混物未表现出橡胶类弹性体特征,而加入适量SBS的共混物表现出典型橡胶类弹性体特征;当SBS用量为8～12份时,BR/EVA/HIPS TPV的综合物理性能较好,拉伸断面平滑,界面相容性良好.     

SBR/BR/SITPV共混胶料的制备及性能研究

将苯乙烯丁二烯热塑性弹性体(SBS)/丁基橡胶(IIR)动态硫化弹性体(SITPV)与丁苯橡胶(SBR)/顺丁橡胶(BR)共混制备的胶料SBR/BR/SITPV,与直接共混制备的SBR/BR/IIR胶料进行对比.结果表明,SITPV的加入会改善ⅡR与SBR/BR体系的相容性,降低ⅡR对SBR/BR体系的影响.具体表现为...     

硅橡胶/丁苯橡胶并用胶的制备及表征

针对硅橡胶具有较高的耐热性,但力学性能差;丁苯橡胶(SBR)力学性能较好,但粘性较差;提出了将硅橡胶与SBR共混,制成共混材料;采用偏光显微镜、傅里叶变换红外光谱、差示扫描量热仪以及力学性能、热老化性能测试手段,研究了甲基乙烯基硅橡胶(MVQ)/SBR共混体系的并用比(质量比)、硫化工艺参数以及顺丁橡胶(BR)的加入对力学性能、耐热老化性能和相容性的影响。结果表明:MVQ与SBR最佳配比为30/70,白炭黑为45份;最佳硫化工艺参数为170℃×10 MPa×30 min。MVQ/SBR并用胶的玻璃化温度为-20℃,MVQ和SBR具有较好的相容性。     

绢云母粉对NR/SBR/BR共混胶热-力学性能的影响

介绍了绢云母粉在NR/SBR/BR,共混胶中的应用研究,探讨了绢云母粉对NR/SBR/BR共混胶的硫化特性、共混硫化胶常温及高温力学性能、屈挠性能、耐热老化性能以及热传导性能影响.结果表明;随着绢云母粉用量的增大,NR/SBR/BR共混胶的常温及高温力学性能、屈挠性能、耐热老化性能以及热传导性能都有不同程度的改善.当绢云母粉的用量为30份时,NR/SBR/BR共混胶具有良好的温力学性能、屈挠性能和热传导性能.     

EVA/POE/BR TPV的粘弹行为研究

采用动态硫化法制备了乙烯-醋酸乙烯共聚物/顺丁橡胶热塑性硫化胶(EVA/BR TPV),研究了其粘弹行为和POE热塑性弹性体对体系高弹性改善作用的影响。结果表明,加入POE能显著降低EVA/BR TPV硬度,且当POE用量在5～10份之间时降低效果较好;随着扫描频率的增大,采用POE改性后的TPV储能模量(G′)、损耗模量(G″)和复数模量(G~*)均逐渐升高,损耗因子逐渐降低。在温度扫描实验中,由于EVA呈半结晶型连续相,其熔融位置出现损耗峰且损耗因子升高;在应变扫描实验中,TPV储能模量、损耗模量和复数模量均在0～10%范围内显著升高,当应变大于10%后三者均显著下降;应变很小时TPV损耗因子基本保持不变,当应变达到60%之后,EVA和POE构成的连续相与SBR分散相的界面作用受到严重破坏,TPV损耗因子发生突变且急剧上升。     

高抗冲聚苯乙烯/丁苯橡胶热塑性硫化胶的Payne效应及模型拟合

采用动态硫化法制备了高抗冲聚苯乙烯(HIPS)/丁苯橡胶(SBR)热塑性硫化胶(TPV)及苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)增容HIPS/SBR TPV,通过橡胶加工分析仪研究了TPV的Payne效应,并利用Kraus模型进行了拟合。结果表明,在相同应变下,随着HIPS/SBR TPV中HIPS含量的增加,TPV的储能模量(G')和损耗模量(G″)均增大;在不同测试温度条件下,随着应变的增加,纯SBR硫化胶的G'及G″变化不大,未出现Payne效应,HIPS/SBR TPV及SBS增容HIPS/SBR TPV均呈现明显的Payne效应;在应变测试范围内,利用Kraus模型对HIPS/SBR TPV及SBS增容HIPS/SBR TPV的G'拟合较好,但不能对G″有效拟合;提高测试温度,HIPS/SBR TPV及SBS增容HIPS/SBR TPV的小应变下G'初始值与大应变下Payne效应终止时G'值降低,G″达到最大值时的应变振幅特征值增大。     

集成橡胶SBR-IR-SBR和SBR-BR-SBR的玻璃化转变温度

考察了调制式差示扫描量热仪的实验影响因素及其对嵌段(丁苯共聚物-聚异戊二烯)集成橡胶(SBR—IR—SBR)和嵌段(丁苯共聚物-聚丁二烯)集成橡胶(SBR—BR—SBR)玻璃化转变温度的影响,并研究了SBR—IR—SBR和SBR—BR—SBR的动态黏弹性能。结果表明,SBR—IR—SBR和SBR—BR—SBR的玻璃化转变温度随着调制式差示扫描量热仪升温速率的增加而增加;SBR—IR—SBR和SBR—BR—SBR中均存在着明显的相分离结构;硫化后的SBR—IR—SBR更易于相分离。     

炭黑在不同并用橡胶中的分布

利用裂解气相色谱研究在不同比例的天然/丁苯(NR/SBR),丁苯/顺丁(SBR/BR)并用胶中炭黑N234的分布情况,及白炭黑在异戊/丁苯(IR/SBR)和丁苯/顺丁(SBR/BR)胶中的分布情况。不同种类的混炼胶所制备的结合胶的裂解气相结果显示:N234在NR/SBR并用胶中优先选择分布在NR中,而在SBR/BR并用胶中优先分布在BR中;而白炭黑在IR/SBR和SBR/BR中均优先选择分布在SBR中。     

天然橡胶/顺丁橡胶/丁苯橡胶自润滑喷蜡橡胶材料的性能

在天然橡胶(NR)/顺丁橡胶(BR)/丁苯橡胶(SBR)为基体的自润滑喷蜡橡胶材料中加入芥酸酰胺,考察芥酸酰胺作为润滑剂时对NR/BR/SBR自润滑喷蜡橡胶材料的硫化特性、力学性能、门尼黏度、摩擦系数及耐老化性能的影响。结果表明,与未加芥酸酰胺的胶料相比,当芥酸酰胺用量为10份时,胶料转矩减小,焦烧时间和正硫化时间缩短,扯断伸长率从388%增加至523%,拉伸强度降低了21.36%,邵尔A硬度、压缩永久变形分别下降5.56%和8.74%,动、静摩擦系数分别减小23.46%和24.82%,门尼黏度降低20.89%,耐热氧老化性能下降。硫化胶拉伸100%停放5 min后,表面出现明显的白色润滑膜,胶料流动性变好,各组分分散得更均匀,断面更光滑。     

硅橡胶／EPDM／ⅡR共混的研究

研究了硅橡胶/三元乙丙橡胶/丁基橡胶的共混技术与硫化体系。对增容剂、共混比例等对共混胶的力学性能的影响进行了探讨。KH570适宜于作为共混增容剂;共混胶宜于采用DCP硫化,也可以采用硫黄硫化,随着丁基橡胶含量的增加,其力学性能有大幅度提高,并出现最佳值点。     

Natural rubber/nitrile butadiene rubber/hindered phenol composites with high-damping properties

New natural rubber (NR)/nitrile butadiene rubber (NBR)/hindered phenol (AO-80) composites with high-damping properties were prepared in this study. The morphological, structural, and mechanical properties were characterized by atomic force microscopy (AFM), polarized Fourier transform infrared spectrometer (FTIR), dynamic mechanical thermal analyzer (DMTA), and a tensile tester. Each composite consisted of two phases: the NR phase and the NBR/AO-80 phase. There was partial compatibility between the NR phase and the NBR/AO-80 phase, and the NR/NBR/AO-80 (50/50/20) composite exhibited a co-continuous morphology. Strain-induced crystallization occurred in the NR phase at strains higher than 200%, and strain-induced orientation appeared in the NBR/AO-80 phase with the increase of strain from 100% to 500%. The composites had a special stress–strain behavior and mechanical properties because of the simultaneous strain-induced orientation and strain-induced crystallization. In the working temperature range of a seismic isolation bearing, the composites (especially the NR/NBR/AO-80 (50/50/20) composite) presented a high loss factor, high area of loss peak (TA), and high hysteresis energy. Therefore, the NR/NBR/AO-80 rubber composites are expected to have important application as a high-performance damping material for rubber bearing.     

TCY／硫黄对ACM／NBR并用胶的交联作用

从混炼胶的硫化特性和硫化胶物理性能等方面考察了三聚硫氰酸（ＴＣＹ）、硫黄和ＴＣＹ／硫黄对丙烯酸酯橡胶（ＡＣＭ）、丁腈橡胶（ＮＢＲ）及其并用胶的交联作用。结果表明,ＴＣＹ／硫黄硫化体系适用于ＡＣＭ／ＮＢＲ并用胶、并用胶的物理性能达到甚至超过了两种胶料的物理性能的加和水平;ＡＣＭ／ＮＢＲ共混并用,加工性能得到明显改善     

混炼型PU/硅橡胶共混物性能的研究

采用机械共混的方法，研究了混炼型PU同硅橡胶按不同比例共混后的物理机械性能及耐热性能。结果表明，在混炼型聚氨酯中加入少量硅橡胶，可提高聚氨酯橡胶的拉伸强度及拉断伸长率，并能显著改善聚氨酯橡胶的耐热性。     

Replacement of virgin rubbers by waste ground vulcanizates in blends of silicone rubber and fluororubber based on tetrafluoroethylene/propylene/vinylidene fluoride terpolymer

This study reports the results of investigations on blends of silicone rubber and fluororubber based on tetrafluoroethylene/propylene/vinylidene fluoride terpolymer and the effects of replacement of silicone rubber and/or fluororubber in their 50/50 blend by the respective vulcanizate powders of known compositions. To simulate the aging condition of factory wastes, the silicone rubber or fluororubber vulcanizates were aged for 72 h at 200°C and then converted into powder by mechanical grinding. The fluororubber vulcanizate powder (FVP), mostly spherical in shape with average diameter varying between 2 and 10 μm, exists in a highly aggregated state displaying chainlike structures that, however, break down during blending with virgin rubbers. The silicone rubber vulcanizate powder (SVP) is irregular in shape, with larger particles in the range of 30–100 μm, and the smaller particles exist in highly aggregated chainlike structures, as in the case of FVP, which break down during milling to mostly spherical particles of 2–10 μm in diameter. Measurements of physical properties reveal that the blends of silicone rubber and fluororubber are technologically compatible. SEM photomicrographs of THF‐etched samples show the biphasic structure of the blends, in which the fluororubber forms the dispersed phase in a continuous silicone rubber matrix of lower viscosity. Replacement of silicone rubber in the 50/50 silicone rubber/fluororubber blend by its vulcanizate powder (SVP) increases the Mooney viscosity, but replacement of fluororubber in the blend by its vulcanizate powder (FVP) has little effect on the Mooney viscosity. Monsanto rheometric studies reveal that replacement of silicone rubber by SVP or fluororubber by FVP in the 50/50 silicone rubber/fluororubber blend increases the minimum rheometric torque but decreases the maximum torque, and the effect is more pronounced in the case of SVP. Furthermore, the replacement of silicone rubber in the blend by SVP causes a decline in the physical properties (25% replacement causing about 10% decline in properties, for example), whereas even 75% replacement of fluororubber by FVP has little effect on the physical properties. When both silicone rubber and fluororubber are partially replaced by SVP and FVP in the same blend, properties of the resulting blend composition are controlled more by SVP incorporation, whereas fluororubber replacement has only a marginal effect on blend properties. It is evident from dynamic mechanical spectra that the blends are immiscible in all compositions and addition of SVP or FVP does not affect the glass–rubber transitions of the constituent polymers. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2326–2341, 2001     

不同共混比Ln—BR／NR的性能

研究了稀土顺丁橡胶（Ｌｎ－ＢＲ）与天然橡胶（ＮＲ）以不同比例共混后生胶、混炼胶和硫化胶的性能，并与相同条件下的镍系顺丁橡胶（Ｎｉ－ＢＲ）／ＮＲ共混胶的性能进行了对比，结果表明，共混胶随Ｌｎ－ＢＲ用量的增大，ＭＬ＾１００℃１＋４降低，工艺行为良好，硫化胶力学性能、磨耗、湿滑指数和生热值下降，并且Ｌｎ－ＢＲ／ＮＲ硫化胶的抗湿滑性和动态疲劳性均优于Ｎｉ－ＢＲ／ＮＲ硫化胶。     

杜仲胶/天然橡胶/顺丁橡胶并用胶的工艺研究

用杜仲胶(TPI)替代部分天然橡胶(NR),并与顺丁橡胶(BR)共混生产出混炼胶,研究了TPI/NR/ BR共混硫化胶料制备过程中,硫化温度、硫化时间、硫化剂的用量、硫化促进剂的种类及用量对胶料物理机械性能的影响。研究结果表明,硫化过程中当硫化温度为150℃、硫化时间为20 min、硫化剂为硫黄(质量不超过3份)和硫化促进剂的含量为2份时,胶料的综合物理机械性能较好。     

一种汽车用氟硅橡胶/聚酯薄膜的研究

介绍一种在高温燃油中使用的氟硅橡胶/聚酯薄膜的研制.通过对氟硅胶料、聚酯织物和粘接体系的研究,给出了所用氟硅橡胶及聚酯织物的性能,以及研制的粘接体系的常规及耐油性能,此外,还提供了氟硅薄膜的生产工艺流程和应用情况.     

甲基乙烯基硅橡胶/丁基橡胶硫化性能和耐热性能研究

通过共混法制备了甲基乙烯基硅橡胶/丁基橡胶复合材料,用DSC研究了复合材料硫化前的结晶性能与硫化性能,用TG研究了复合材料硫化后的热分解性能。根据在不同升温速率下的DSC曲线,用Kissinger方程对复合体系的硫化性能进行动力学研究,得到了交联反应活化能为95.1 kJ/mol、反应级数n为0.78。TG测试表明,复合材料的耐热性介于二者之间。力学测试表明,该材料的综合物理力学性能较好,可以作为阻尼材料使用。