CPE/PA6共混物性能研究

考察CPE／PA6不同并用比、未经过动态硫化及经过动态硫化共混物各项物理机械性能的比较．得到CPE／PA6随并用比的变化其各项物理机械性能的变化规律。结果表明，共混物拉伸强度、100％定伸应力、硬度、拉伸永久变形随PA6用量的增加而增大，并且经动态硫化的共混物以上性能有进一步的提高；而拉断伸长率、耐介质体积变化率随PA6用量的增加不断减小：通过SEM可观察到动态硫化和非动态硫化共混物的微观结构变化。     

动态硫化EPDM/PP共混物力学性能的研究

考察了硫黄用量和聚合物共混比对动态硫化ＥＰＤＭ／ＰＰ热塑性弹性体性能的影响。结果表明,随着硫黄用量增大,ＥＰＤＭ／Ｐ共混物的拉伸强度、１００％定伸应力和扯断伸长率先增大后减小、硬度有所增大,随着ＰＰ用量的增大,ＥＰＤＭ／ＰＰ共混物的拉伸强度、１００％定伸应力和硬度均有所增大,扯断伸长率也先大后减小。ＰＰ用量的变化对这些性能的影响更显。     

动态硫化氯化丁基橡胶/聚丙烯酸乙酯共混物的熔体流变行为

研究了由不同动态硫化时间制备的氯化丁基橡胶(CIIR)和聚丙烯酸乙酯(PEA)共混物熔体的流变行为。结果表明,在不同的动态硫化时间里,CIIR／PEA共混物熔体的黏度均随着剪切速率的增加而先增后减,共混物熔体显示出膨胀性流动和假塑性流动相复合的复杂流变行为;动态硫化时间越长,熔体的最大黏度越小,动态硫化时间越短,熔体的最大黏度越大。在高剪切速率下,共混物熔体均具有适宜于模塑的良好流动性。     

氧化石墨烯增容及增强羧基丁腈橡胶/丁苯橡胶共混物（英文）

制备了氧化石墨烯/羧基丁腈橡胶/丁苯橡胶共混硫化胶,研究了氧化石墨烯对硫化胶的相容性和力学性能的影响。结果表明,氧化石墨烯可有效改善共混硫化胶的相容性,当氧化石墨烯用量为0.3份(质量)时,共混硫化胶的力学性能达到最佳,100%定伸应力、300%定伸应力、拉伸强度和撕裂强度分别提高了44%、107%、71%和94%。     

振动力场下动态硫化EPDM/PP共混物的研究

在振动力场中采用硫磺硫化体系对三元乙丙橡胶(EPDM)／聚丙烯(PP)共混物进行动态硫化实验，研究了振幅和振动频率对共混物凝胶量和力学性能的影响。结果表明：随着振频、振幅的增加，共混物的凝胶量、拉伸强度、剪切强度和断裂伸长率都有一定程度的提高，100％定伸应力存在一个最佳值。     

过氧化物硫化体系对CM／XNBR共混物性能的影响研究

研究了不同用量过氧化物硫化体系对氯化聚乙烯橡胶（CM）／羧基丁腈橡胶（XNBR）共混硫化胶各相交联密度及热空气老化前后的物理机械性能、耐油性能等的影响规律。结果表明,随硫化体系用量的增加,共混硫化胶两相的交联密度都明显增加,交联密度差值变大;焦烧时间逐渐降低;硬度、拉伸强度、100％定伸应力、体积磨耗量呈上升趋势,永久变形、扯断伸长率明显降低,撕裂强度整体变化不大,常温下体积和质量变化率均很小,高温下体积和质量变化率明显降低后趋于平稳;热空气老化后,硬度、拉伸强度、100％定伸应力、撕裂强度整体上升,扯断伸长率整体下降,体积磨耗量整体变化不大;热油老化后,拉伸强度、100％定伸应力变化不大,扯断伸长率明显降低。     

硫化剂TCY用量对CM/ACM共混硫化胶性能影响研究

研究了硫化剂TCY的用量对氯化聚乙烯橡胶(简称CM)/丙烯酸酯橡胶(简称ACM)共混硫化胶性能的影响。结果表明,随硫化剂TCY用量的增加,共混胶焦烧时间基本不变;MH—ML的值逐渐增大,交联程度增加;硫化胶的硬度逐渐增大,撕裂强度先增大后减小;拉伸强度先下降后上升,100%定伸应力增大,扯断伸长率和永久变形增大;老化后拉伸强度先下降后上升,100%定伸应力增大,扯断伸长率和永久变形增大;拉伸强度和100%定伸应力大于老化之前,差值较小。扯断伸长率、永久变形小于老化之前;耐热油老化后拉伸强度、100%定伸应力、扯断伸长率、永久变形的变化趋势与未耐热油老化之前基本相同,且低于耐热油老化之前;体积变化率、质量变化率均下降,耐热油性提高。     

甲基乙烯基硅橡胶/氯化丁基橡胶共混比对共混物性能的影响

研究甲基乙烯基硅橡胶(MVQ)/氯化丁基橡胶(CIIR)共混比对共混物性能的影响。结果表明:与CIIR相比,MVQ/CIIR共混物的t10(MVQ用量为5份除外)和t90缩短,硫化速率增大;邵尔A型硬度、拉伸强度、拉断伸长率和撕裂强度降低,耐热老化性能提高;MVQ用量为0~20份时MVQ/CIIR共混物对芥子气"液-气"的防护时间达到360min(不透);MVQ用量为25份时MVQ/CIIR共混物的耐低温性能大幅提高。MVQ/CIIR共混比为15/100左右时MVQ/CIIR共混物的综合性能最佳。     

热塑性聚氨酯弹性体与乙华平橡胶共混物的性能

将聚酯型和聚醚型聚氨酯弹性体(TPU385E,TPU8685)分别与不同乙酸乙烯酯含量的乙华平橡胶(EVM400,EVM700)进行共混,考察了原料种类、共混比对共混物力学性能和耐磨性的影响。结果表明,随着TPU用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均提高,扯断伸长率下降;随着EVM用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均降低,扯断伸长率增大;随着TPU用量的增加,EVM/TPU共混物的耐磨性提高;TPU8685/EVM400共混物具有最大的拉伸强度,TPU385E/EVM700共混物具有最大的扯断伸长率,TPU8685/EVM700共混物具有最好的耐磨性;当2种TPU与EVM400质量比都为50/50时,TPU385E/EVM400的耐磨性最差。     

EPDM/PA配比对硫化胶老化性能及耐油性能的影响

研究了三元乙丙橡胶(EPDM)/三元尼龙(PA)配比对其硫化胶热空气老化前后和油中浸泡后物理机械性能的影响。结果表明,随着PA用量的增大,硫化胶拉伸强度下降后趋于稳定,撕裂强度变化不大,100%定伸应力和DIN磨耗均呈上升趋势,拉断伸长率、浸油后的质量变化率和体积变化率均下降,正硫化时间变长。热空气老化后,硫化胶拉伸强度、硬度、100%定伸应力和拉断伸长率变化趋势同常温下一致。浸油后,硫化胶拉伸强度、100%定伸应力均呈上升趋势,拉断伸长率先是不变然后下降。     

硫化体系对氯化丁基橡胶/尼龙12动态硫化胶性能的影响

研究了氧化锌、N,N’-间苯撑双马来酰亚胺(HVA-2)/氧化锌和1,3-双柠糠酰亚胺甲基苯(PK 900)/氧化锌3种硫化体系下氯化丁基橡胶(CIIR)/尼龙(PA)12混炼胶的硫化特性及CIIR/PA 12动态硫化胶(TPV)的物理机械性能和微观相结构,并考察了PK 900与氧化锌不同配比对CIIR/PA 12TPV物理机械性能、流变性能及微观相结构的影响。结果表明,PK 900/氧化锌的硫化速率介于氧化锌和HVA-2/氧化锌两者之间,由其制备的TPV橡胶相粒径为1～2μm,均匀分布在树脂相中,物理机械性能最优;固定PK 900用量为3份时,随着氧化锌用量的减少,CIIR/PA 12 TPV的拉伸强度、扯断伸长率和100%定伸应力均呈现先增大后减小的趋势;当PK 900/氧化锌(质量比)为3/5时,CIIR/PA 12TPV的物理机械性能最佳,且呈现低剪切速率高黏度、高剪切速率低黏度的特性。     

反式聚辛烯橡胶改性天然橡胶/顺丁橡胶共混胶的性能

研究了反式聚辛烯橡胶（TOR）改性天然橡胶（NR）/顺丁橡胶（BR）（二者质量比80/20）共混胶的性能。结果表明,采用5～15份（质量,下同）TOR改性NR/BR混炼胶的门尼黏度逐渐降低、Payne效应基本不变,共混胶的焦烧时间和工艺正硫化时间延长、硫化速率减慢。相比NR/BR硫化胶,NR/BR/TOR硫化胶的拉伸强度、扯断伸长率和撕裂强度明显减小,回弹性能提高,100%定伸应力、硬度和滚动阻力略有增大,压缩生热有所升高,耐磨和耐疲劳裂纹引发性能得到改善。用TOR改性NR/BR共混胶时的最佳用量为5份。     

乙烯基含量对热硫化硅橡胶抗撕裂性能的影响

研究不同乙烯基含量对热硫化硅橡胶的力学性能尤其是抗撕裂性能的影响,采用平衡溶胀法测定硅橡胶的交联密度,研究不同乙烯基含量的硅橡胶并用胶的撕裂强度和交联密度的关系。结果表明,随着硅橡胶乙烯基含量的增大,硅橡胶硫化胶的断裂伸长率减小,300%定伸应力和硬度升高,当乙烯基摩尔分数为0.15%时,撕裂强度和拉伸强度较高。乙烯基摩尔分数为0.15%的硅橡胶和乙烯基摩尔分数为0.06%的硅橡胶并用,当并用比为50/50时,撕裂强度高达45.8 kN/m,乙烯基摩尔分数为0.30%的硅橡胶和乙烯基摩尔分数为0.06%的硅橡胶并用,当并用比为4/96时,撕裂强度可达42.9kN/m。乙烯基摩尔分数为0.30%的硅橡胶和乙烯基摩尔分数为0.15%的硅橡胶并用,并用比对硫化胶的撕裂强度影响不大。高乙烯基含量和低乙烯基含量的硅橡胶并用,有利于使硅橡胶的交联结构由"分散交联"转变为"集中交联",当并用胶的乙烯基摩尔分数在0.15%以内,硅橡胶并用胶的撕裂强度随乙烯基摩尔分数的增加而先增大后降低,而此时并用胶的交联密度与撕裂强度成反比。     

Chlorinated butyl rubber/two-step modified montmorillonite nanocomposites: Mechanical and damping properties

Montmorillonite (MMT) was modified by ultrasound and castor oil quaternary ammonium salt intercalation method to prepare a new type of organic montmorillonite (OMMT). The surface structure, particle morphology, interlayer distance, and thermal behavior of the samples obtained were characterized. The modified OMMT was then added to chlorinated butyl rubber (CIIR) by mechanical blending, and a composite material with excellent damping properties was obtained. The mechanical experiment results of CIIR nanocomposites showed that the addition of OMMT improved their tensile strength, hardness, and stress relaxation rate. Compared with pure CIIR, when the content of OMMT was 5 phr (part per hundred of rubber), the tensile strength of the nanocomposite was increased by 677% and the elongation at break was also increased by 105.4%. The enhancement of this performance was mainly due to the dispersion of the nanosheets in CIIR rubber and the chemical interaction between the organoclay and the polymer matrix, which was confirmed by morphology and spectral analysis. OMMT also endowed a positive effect on the damping properties of CIIR nanocomposites. After adding 5 phr of OMMT, the nanocomposite owned the best damping performance, and the damping factor, tanδ_max, was 37.9% higher than that of pure CIIR. Therefore, the good damping and mechanical properties of these CIIR nanocomposites provided some novel and promising methods for preparing high-damping rubber in a wide temperature range.     

废胶粉/聚丙烯接枝物共混材料的制备与性能

采用熔融接枝法分别制备了高强度和高熔体流动速率的聚丙烯接枝马来酸酐共聚物,以改善聚丙烯与胶粉间的界面相容性,提高废胶粉/聚丙烯接枝物共混材料的力学性能和流动性.力学性能测试结果表明,随着废胶粉用量的增加,废胶粉/聚丙烯接枝物共混材料的拉伸性能下降,扯断伸长率和缺口冲击强度均增大,熔体流动速率减小,流动性变差.由热重分析...     

PA6/ABS共混物性能研究

将聚酰胺6（PA6）与市售的丙烯腈-丁二烯-苯乙烯（ABS）树脂共混,制备PA6/ABS共混物。研究了ABS树脂的用量对PA6/ABS共混物力学性能的影响;采用苯乙烯及丙烯腈共聚物（SAN）和ABS粉料熔融共混制得不同胶含量的ABS/SAN共混物。研究了不同胶含量的ABS/SAN共混物对PA6/ABS共混物力学性能的影响。在PA6/ABS/SAN共混物中引入苯乙烯-丙烯腈-马来酸酐共聚（SAM）树脂取代部分SAN树脂,研究了SAM树脂的加入及引入顺序的不同对共混物性能的影响。结果表明, ABS树脂的用量在50%～60%左右时共混物性能最佳。随ABS/SAN共混物胶含量提高,共混物的拉伸强度、弹性模量、弯曲强度和弯曲模量逐渐降低。随SAM树脂替代SAN量增加,共混物的拉伸和弯曲性能先降低后增加。但共混物熔体流动速率降低明显,而SAM树脂的引入顺序对共混物的力学性能影响不大。     

Mechanical and viscoelastic behavior of natural rubber and carboxylated styrene‐butadiene rubber latex blends

The morphology, mechanical and viscoelastic behavior of latex blends of unvulcanized natural rubber (NR) with carboxylated styrene‐butadiene rubber (XSBR) were investigated, with special reference to the effect of the blend ratio, temperature, and frequency. Mechanical properties like tensile strength, modulus, and elongation at break were also studied. As the XSBR content increased, the tensile strength increased up to a 50:50 NR/XSBR ratio and then decreased as a result of the self‐curing nature of XSBR. The dynamic mechanical properties of these latex blends were analyzed for loss tangent, storage modulus, and loss modulus. The entire blend yielded two glass‐transition temperatures, which corresponded to the transitions of individual components, indicating that the system was immiscible. To determine the change in modulus with time, a master curve of 50:50 NR/XSBR blends was plotted. Time–temperature superposition and Cole–Cole analysis were done to understand the phase behavior of the latex blends. The experimental and theoretical values of storage modulus of blends were compared using the Kerner and Halpin–Tsai models. With the help of optical micrographs, attempts were made to correlate the morphology and viscoelastic behavior of these blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2639–2648, 2003     

Ionic elastomer blends of zinc salts of maleated natural rubber and carboxylated nitrile rubber: Effect of grafted maleic anhydride

Zinc neutralized maleated natural rubbers (Zn‐MNR) were prepared by solution grafting and neutralization with zinc acetate in one‐step. It was later used for blending with carboxylated nitrile rubber (XNBR) in the composition of 50/50 parts by weight. The effect of grafted anhydride content (1.2, 1.6, 2.0, and 2.5% wt of NR) on the tensile properties of ionic rubber blends (Zn‐MNR/XNBR) was investigated. The tensile strength of the ionic blends was found to be greater than those of pure rubbers. The modulus, tensile, and tear strength of the blends dramatically increased with increasing levels of grafted anhydride. The ionic rubber blends also possessed superior physical properties compared to those of the corresponding nonionic rubber blends (MNR/XNBR). Dynamic mechanical thermal analysis and scanning electron microscopic studies were performed to verify the process of mixing. Fourier transform infrared spectroscopic studies were carried out to characterize the nature of specific intermolecular interactions between Zn‐MNR and XNBR chain segments. The results indicated that the ion‐ion (Zn⁺ ‐COO^?) interactions between Zn‐MNR and XNBR are formed at the interface, which provides the mean of compatibilization in the ionic rubber blends. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Covulcanisation of natural rubber and chlorobutyl rubber. Effect of curative diffusion between phases and ZnCl2 addition

Abstract

Natural rubber (NR) and chlorobutyl rubber (CIIR) were compounded with various formulations containing tetramethylthiuram disulphide (TMTD), sulphur, and ZnO, and masterbatches of these compounds were blended in a 70 : 30 NR/CIIR ratio and vulcanised in a press at 150°C. Crosslink densities of vulcanisates were determined by swelling and tensile properties measured. In formulations in which the concentration gradient permitted the diffusion of TMTD and sulphur to a CIIR phase containing ZnO, tensile strengths were slightly better than 70% of the values of NR compounds of similar crosslink densities. In formulations in which TMTD and sulphur diffused to the faster curing NR phase, blend properties were also better than 70% of those of NR compounds, but at higher crosslink densities, tensile strengths and elongation at break decreased in parallel. This was attributed to failure in a layer of more highly crosslinked material formed within the NR phase close to the interface. Although ZnCl₂ can crosslink CIIR to NR, thus ensuring good interfacial bonding, the addition of ZnCl₂ to the CIIR masterbatch led to attack on the TMTD accelerator and a significant reduction in crosslink density and tensile properties of blends.     

氯醚橡胶/丁腈橡胶共混物的结构与性能

研究了不同并用比的氯醚橡胶（ECO）／丁腈橡胶（NBR）共混物的相态结构,力学性能,耐老化性能和耐油性能,透射电镜照片显示：ECO／NBR为70／30（质量份,下同）时共混物呈双连续相：为60／40和40／60时ECO都为分散相,且两相界面清晰。加入NBR降低了ECO的拉伸强度和看断伸长率,以及耐热空气老化性能,随着NBR用量的提高,共混物硫化胶在油中的体积变化率增加,ECO／NBR为70／30时硫化胶在100℃热油中的性能保持率最高,而且体积变化率与ECO的相当。