顺丁橡胶为基体的吸水膨胀橡胶的力学性能

研究了顺丁橡胶与部分水解的聚丙烯酰胺（ＰＨＰＡＭ）共混制得的吸水膨胀橡胶（ＷＳＲ）的力学性能,发现ＰＨＰＡＭ用量对干态ＷＳＲ的强伸性能有明显影响;而当ＰＨＰＡＭ含量一定时,随ＷＳＲ吸水率提高,扯断强度和伸长率出现一最大值后下降,压缩永久形变则随吸水膨胀率的提高而减小。     

原位生成PNaAA/EPDM吸水膨胀橡胶的吸水膨胀性能研究

采用原位生成法制备聚丙烯酸钠(PNaAA)／EPDM吸水膨胀橡胶，研究其吸水膨胀性能的影响因素。结果表明，过氧化二异丙苯用量增大，硫化胶的吸水膨胀性能降低，NaAA理论生成量增大，硫化胶的吸水膨胀性能提高，氢氧化钠／AA摩尔比为1～1．2时，硫化胶的吸水膨胀性能较好，水溶液温度高，硫化胶的吸水膨胀率较大，水溶液中Na^ 含量越大，硫化胶(尤其是NaAA理论生成量大时)的吸水膨胀率越小。     

丁腈吸水膨胀橡胶的制备及性能研究

采用聚丙烯酰胺(PAM)、硫磺和乙二胺四乙酸二钠(EDTA-2Na)对丁腈橡胶(NBR)进行物理共混改性,通过调节三类添加剂的含量制备了不同性能的改性NBR,研究了改性NBR的硫化性能、力学性能以及吸水膨胀性能.结果表明,PAM含量增加使NBR的力学性能下降,但硫化与吸水膨胀性能略微提高;硫磺含量增加可以提高拉伸强度但...     

三元乙丙橡胶基吸水膨胀橡胶性能的研究

研究白炭黑、石蜡油、吸水树脂和吸水助剂ZA用量对三元乙丙橡胶吸水膨胀橡胶性能的影响。结果表明：在使用石蜡油改善胶料加工性能时,需要加入20份以上的白炭黑,否则硫化胶难以吸水;过大的石蜡油用量会减慢硫化胶的吸水速率和减小饱和吸水率,石蜡油用量应不超过50份;吸水树脂用量小于30份时,硫化胶的吸水速率较慢和饱和吸水率较小,吸水树脂用量超过50份时,硫化胶的吸水速率较快,吸水树脂用量越大,硫化胶的饱和吸水率越大,但拉伸强度降低;加入吸水助剂ZA可以加快硫化胶的吸水速率,吸水助剂ZA用量越大,硫化胶的吸水速率越快,加入15份吸水助剂ZA可增大硫化胶的饱和吸水率,吸水助剂ZA用量超过15份后硫化胶的饱和吸水率变化很小。     

原位合成丙烯酸钠改性三元乙丙橡胶制备吸水膨胀橡胶

通过氢氧化钠(NaOH)和丙烯酸(AA)的中和反应,在三元乙丙橡胶(EPDM)中原位合成丙烯酸钠(NaAA),并在有机过氧化物的作用下将所得混炼胶进行硫化。比较了原位生成NaAA、直接添加NaAA和直接添加聚丙烯酸钠(PNaAA)等三种不同制备吸水膨胀橡胶方法对混炼胶硫化性能和硫化胶吸水膨胀性能的影响,主要研究了原位合成NaAA改性EPDM混炼胶的硫化特性和硫化胶的吸水膨胀性能及其力学性能。结果表明,原位合成NaAA改性EPDM的性能优于直接添加NaAA或PNaAA的EPDM,它不但具有良好的力学性能,而且还具有良好的吸水膨胀性能;随着NaAA含量的增大,硫化速度、硫化程度和吸水膨胀性能均有提高;吸水膨胀橡胶,在NaAA为30质量份时,力学性能具有最大值。过氧化二异丙苯(DCP)用量增大,吸水膨胀率下降,但仍可提高硫化胶的力学性能。     

吸水膨胀橡胶

橡胶本身是疏水性材料,但配入亲水性大的物质可以增加它的吸水性,橡胶中添加超吸水性树脂,可以得到遇水后体积膨胀高达４－６倍吸水性橡胶制品,也可通过橡胶与聚环氧乙烯接枝制备吸水膨胀橡胶。吸水膨胀橡胶广泛用于建筑和地下管道的防水工程。     

遇水膨胀橡胶的吸水膨胀和力学性能研究

以天然橡胶和吸水树脂（聚丙烯酸钠）为主要原料，以含聚氧化乙烯嵌段的亲水亲油型多嵌段共聚物为增容剂，活性陶土为补强剂，利用多组分机械共混技术，制备了遇水膨胀橡胶，从吸水动力学数据出发，研究了重量吸水率与增容剂含量，吸水树脂含量之间的关系；对遇水膨胀橡胶吸水前后的力学性能进行了测试。结果表明，增容剂的加入能显著改变遇水膨胀橡胶的吸水性能和力学性能。     

吸水膨胀橡胶的改性研究进展

介绍吸水膨胀橡胶(WSR)的改性研究概况。WSR由橡胶基体和亲水性物质组成，橡胶基体一般选用弹性大、粘合性能好、结晶度高的极性橡胶，亲水性物质多采用高吸水性树脂。对WSR主体材料进行改性，综合运用多种类型的吸水材料，采用一段亲水、一段亲油的接枝或嵌段共聚物作为相容剂，可有效改善WSR中橡胶基体和亲水性物质的相容性，提高WSR的性能，减少吸水树脂的析出。     

改性吸水树脂合成及其吸水膨胀橡胶的性能

本文以聚丙烯酸钠为主要原料,用抗坏血酸/过氧化氢为引发体系合成了聚丙烯酸钠系吸水树脂,并将所制备的吸水树脂与天然橡胶制备成吸水膨胀橡胶,考察了甲基丙烯酸缩水甘油酯（GMA）与丙烯酸钠的比例对吸水树脂性能及其吸水膨胀橡胶性能的影响。实验结果表明, GMA改性吸水树脂对吸水树脂及其吸水膨胀橡胶性能的吸水性能有较大的影响,同时GMA改性吸水树脂可与橡胶共硫化。当GMA的物质量比为2%时,制备的吸水橡胶各项性能最佳,力学性能较佳,橡胶吸水膨胀过程中,吸水树脂析出现象显著降低。     

吸水膨胀橡胶的研究进展

介绍了吸水膨胀橡胶的吸水机理、制备方法及应用,简要分析了影响吸水膨胀橡胶吸水膨胀性能和力学性能的各种因素。     

共混型吸水膨胀橡胶增容剂的研究进展

在共混型吸水膨胀橡胶（WSR）中添加适当的增容剂,可以提高WSR中弹性体与亲水性组分的微观相容性,进而提高WSR吸水膨胀性能、力学性能及耐用性等应用性能。本文介绍了共混型吸水膨胀橡胶增容剂的国内外研究现状。     

IIR/EPDM共混物的物理机械性能

研究了IIR／EPDM并用体系中共混比、硫磺硫化体系以对共混性能的影响。结果表明，IIR与EPDM相容性较好，而且可以达到共硫化；IIR。EPDM质量比为75／25时，共混物的物理机械性能和老化性能较好；用硫黄、低硫高促进剂和无硫硫化体系都得到性能良好的共混物，其中以前者硫化的共混物性能最为突出。     

In situ formed internal water channels improving water swelling and mechanical properties of water swellable rubber composites

In this study, electrospun nanofibers of poly (vinyl alcohol) (PVA) and styrene–butadiene–styrene triblock copolymer (SBS) were employed in conventional water‐swellable rubber (WSR) to design WSR composites with improved water swelling and mechanical properties. With the introduction of PVA nanofibers, considerable improvement in elasticity, strength, and water‐swelling behavior was observed. After immersion, PVA nanofibers dissolved within the composite to in situ form water channels to connect isolated super‐absorbent polymers (SAPs). Those water channels led to an increase in water uptake by the WSR composite. Furthermore, the secondary water‐swelling behaviors of the WSR composite showed a remarkable increase in swelling rate as well as in mechanical properties. The addition of SBS nanofibers had a marked impact on the mechanical properties of the WSR composite. Their roles became more pronounced after water immersion. The proposed enhancement mechanism is also discussed. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44548.     

氯化聚乙烯对三元乙丙橡胶与丁腈橡胶并用胶物理机械性能的影响

研究了氯化聚乙烯对EPDM／NBR并用胶物理机械性能的影响。结果发现，加入氯化聚乙烯后，并用胶的混合平衡扭矩降低，达到平衡扭矩所需的时间缩短，且无论用硫黄硫化还是用过氧化物硫化，硫化胶的物理机械性能都提高，表明氯化聚乙烯对EPDM／NBR并用胶有一定的增容作用。同时也发现用过氧化物硫化的EPDM／NBR并用胶物理机械性能优于硫黄硫化的并用胶物理机械性能。     

Anisotropic swelling of thin EPDM rubber discs by absorption of toluene

Anisotropic swelling of thin EPDM discs is observed when they are in contact with toluene resulting from the liquid absorption. The process is controlled by transient diffusion, with a concentration-dependent diffusivity and a finite coefficient of convective transfer at the liquid-rubber interface. Moreover a rather high swelling takes place during the stage of absorption, leading to an increase in dimensions of the flat discs. The increase in the thickness of the discs is around 1.17-1.18 times larger than that in the radius, exhibiting an anisotropic behaviour. The flat discs have been cured by pressing them in the heated slabs of a press, leading to a kind of orientation of the molecules. The state of cure of around 96% has been determined either by calorimetry in scanning mode or by a moving die rheometer under isothermal conditions at three temperatures within the 170-190 °C range. Various percent peroxide as a vulcanising agent have been used, e.g. 2, 10, and 20%. While the diffusivity is about similar for the three samples, the extent of liquid absorbed decreases with the percent peroxide. A numerical model based on finite differences taking into account all these facts has been built in order to describe the process.     

有机介质中聚丙烯酸钠/SBR共混型WSR的溶胀性能

研究了兼具双亲性和膨胀性吸水膨胀橡胶对有机溶剂的吸收性能，测定了该吸水膨胀橡胶中有机相的溶解度参数，研究了吸水树脂等无机相对吸水膨胀橡胶在有机溶剂中最大溶胀度的影响。     

溶胀法制备甲基丙烯酸锌增强天然橡胶

采用溶胀法制备甲基丙烯酸锌增强天然橡胶(NR),考察了不饱和羧酸种类、氧化锌和过氧化二异丙苯(DCP)的用量以及溶胀温度和溶胀时间对增强NR性能的影响。结果表明,与丙烯酸锌相比,甲基丙烯酸锌可以更有效地增强NR;当DCP和氧化锌的用量分别为2.0份和10份时,甲基丙烯酸锌增强NR硫化胶的的综合性能最好;当溶胀温度为14℃时,甲基丙烯酸锌增强NR硫化胶的增强效果随溶胀时间延长而逐渐增大,超过一定时间后保持稳定;当提高溶胀温度时,该硫化胶达到最佳性能所需的溶胀时间明显缩短。     

共混比对丁腈橡胶/氯醚橡胶性能的影响

研究了共混比时常规共混及动态硫化共混丁腈橡胶(NBR)／氯醚橡胶(ECO)的力学性能及加工流变性能的影响。结果表明,共混比对NBR／ECO胶料的力学性能及加工流变性能影响显著。NBR经动态硫化后,压缩永久变形及挤出胀大明显减小,拉伸强度提高,表现黏度随ECO用量的增大而减小。共混比对常规共混胶的表观黏度影响不大。动态硫化有利于改善NBR／ECO胶料的加工性能。     

Study on foaming water‐swellable EPDM rubber

A foaming ethylene propylene diene terpolymer (EPDM) water‐swellable rubber (WSR) was prepared using the multicomponent mechanical blending technology. The morphology of unfilled and silica‐filled foaming EPDM WSR was studied from micrographs. The average cell size, maximum cell size, and cell density of the foaming WSR had a peak value with a 4‐phr foaming agent loading in both unfilled and silica‐filled WSR. The addition of silica made the average cell size and maximum cell size decrease and the cell uniform. With incorporation of silica, the tensile strength of the unfoaming WSR increased three times, while that of the foaming WSR increased about six times before immersing it into water. After water‐swelling, the mechanical properties of both the unfilled WSR and silica‐filled unfoaming WSR decreased, but that of the silica‐filled foaming WSR increased. The silica filler accelerated the water‐swelling rate and cut down the water‐swelling equilibrium time at the same time. The foaming WSR had a better volume water‐swelling ratio than that of the unfoaming WSR in both the unfilled and silica‐filled WSR. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3712–3717, 2002     

三元乙丙橡胶－甲基丙烯酸甲酯溶胀机械接枝共聚研究

采用直接溶胀法，在叶片混合器中以不同条件制备了三元乙丙橡胶－甲基丙烯酸甲酯接枝共聚物。通过动态力学粘弹谱表征，该接枝共聚物具有稳定的双相体系相态。在适宜条件下，可以制得较好综合性能的接枝共聚物。