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.     

TPI和不同硫化体系下硫黄用量对TPI/NR/BR并用胶性能的影响

研究TPI和不同硫化体系下硫黄用量对TPI/NR/BR并用胶性能的影响,结果表明,TPI/NR/BR并用比为15/42.5/42.5、选用普通硫黄硫化体系且硫黄用量为2份时,TPI/NR/BR混炼胶的加工性能良好,硫化胶可达到物理性能、动态疲劳性能和耐热空气老化性能的平衡.     

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.     

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。     

改性淀粉对炭黑填充丁苯橡胶/顺丁橡胶并用胶性能的影响

用改性淀粉替代部分炭黑填充丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶,考察了改性淀粉用量及偶联剂种类对混炼胶硫化特性及硫化胶物理机械性能和动态力学性能的影响.结果表明,用改性淀粉替代部分炭黑可对SBR/BR混炼胶的硫化产生明显的延迟作用,但改性淀粉用量的变化对焦烧时间与正硫化时间影响不大;添加偶联剂KH-570或NDZ-201延迟了混炼胶的硫化过程,KH-550能大幅度地促进硫化作用,Si-69对于体系的硫化性能略有影响;随着改性淀粉用量的增加,SBR/BR硫化胶的拉伸性能、耐磨耗性均有所降低,但弹性、动态生热和滞后性能得到了明显改善,改性淀粉最佳用量为5～8份;各种偶联剂均可提高SBR/BR硫化胶的拉伸性能,硅烷偶联剂Si-69和KH-570对弹性和动态生热也略有改善,添加偶联剂KH-550改善了SBR/BR硫化胶的抗湿滑性能,但滞后性能变差,添加偶联剂KH-570或Si-69对SBR/BR硫化胶动态力学性能的影响较小,综合考虑,以添加偶联剂KH-570较好.     

无喷霜硫化体系中硫黄用量对三元乙丙橡胶/白炭黑硫化胶性能的影响

采用无喷霜硫黄硫化体系,考察了硫黄用量对三元乙丙橡胶(EPDM)/白炭黑(WCB)混炼胶硫化特性及硫化胶物理机械性能、耐热老化性能、动态力学性能和压缩永久变形的影响。结果表明,在硫黄用量为0.5~1.5份的条件下,随着硫黄用量的增加,EPDM/WCB混炼胶的硫化速率减慢,硫化胶的拉伸强度先升高后下降,当硫黄用量为1.00份时达到最大值(22.4 MPa),同时扯断伸长率和永久变形逐渐下降,邵尔A硬度升高;热空气老化后,硫化胶的拉伸强度、撕裂强度和硬度均提高,但扯断伸长率下降幅度较大;随着硫黄用量的增加,硫化胶的玻璃化转变温度向高温方向移动,损耗因子峰值先升高后下降,储能模量增大,压缩永久变形略有减小。     

NR/BR/TPI并用胶性能之研究

按照NR/BR/TPI并用胶90/10/0,85/10/5,80/10/10,75/10/15,70/10/20之不同配比,研究了TPI对并用混炼胶性能、硫化胶的力学性能、老化性能及其分散状态的影响。结果表明,当TPI含量为5份时,TPI与NR和BR相容性最好,硫化胶硫化网络结构均匀,交联网络达到了极大值,tanδ值较小,动态性能优异,NR/BR/TPI并用混炼胶性能优异。     

炭黑增强EVA/CMTPV的性能研究

以炭黑作补强剂,采用动态硫化法制备了乙烯-醋酸乙烯共聚物(EVA)/氯化聚乙烯(CM)热塑性硫化胶(TPV),并研究了力学性能、Mullins效应和微观相结构。结果表明,当EVA/CM/CB质量比在40/60/6~40/60/24范围内时,TPV动态硫化产物表现出良好的综合性能。单轴循环拉伸实验表明,TPV存在明显的Mullins效应,即第1次拉伸后就表现出明显的应力软化现象;在拉伸比固定不变时,TPV最大应力随拉伸次数的增加而下降,残留应变逐渐增大。SEM观察结果表明,动态硫化EVA/CM/CB TPV的拉伸断面较为平坦,表现出良好的弹性回复能力,刻蚀样品表面均匀分散着CM硫化胶粒子,其平均尺寸为2μm左右。     

白炭黑/纳米甲壳素/多层石墨烯对溶聚丁苯橡胶/顺丁橡胶并用胶性能的影响

将白炭黑、纳米甲壳素与多层石墨烯三者并用填充溶聚丁苯橡胶(SSBR)/顺丁橡胶(BR)并用胶,考察了多层石墨烯用量对并用胶硫化特性、物理机械性能、耐老化性能及Payne效应的影响。结果表明,加入多层石墨烯后,SSBR/BR混炼胶的焦烧时间及正硫化时间明显缩短,硫化速率加快,加工性能得到改善;随着多层石墨烯用量的增加,SSBR/BR硫化胶的拉伸强度略提高后降低,100%定伸应力及300%定伸应力逐渐降低,扯断伸长率增大,撕裂强度及邵尔A硬度变化不大;经热空气老化后,SSBR/BR硫化胶的拉伸强度变化率明显降低,综合考虑,多层石墨烯最佳用量为1.0份;随着多层石墨烯用量的增加,SSBR/BR混炼胶的Payne效应逐渐下降,而硫化胶的Payne效应变化不大。     

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.     

硫化体系对动态硫化EPDM/POE热塑性弹性体性能的影响

采用动态硫化的方法在Haake转矩流变仪上制备了三元乙丙橡胶/聚烯烃(EPDM/POE)热塑性弹性体(TPV),并分别对不同硫化体系和硫化剂用量对TPV交联密度和性能的影响进行了研究。结果表明,随硫化剂用量的增加,TPV的交联密度增大,其中硫黄硫化体系的TPV变化最明显;采用硫黄硫化体系和酚醛树脂硫化体系制备的TPV性能优于过氧化物硫化体系,并且DCP和硫黄分别在用量为0.5份,酚醛树脂在1.0份时性能较佳。     

PAAS含量对吸水膨胀型PVO／OMTPV性能的影响

采用交联聚丙烯酸钠（PAAS）为吸水材料,通过动态硫化法制备了聚氯乙烯（PVC）j氯化聚乙烯橡胶（cM）热塑性硫化胶（TPV）,并对其力学性能、微观相态结构及吸水行为进行了研究。结果表明：在实验范围内,PVC／PAAS／CMTPV呈现出典型弹性体软而韧的应力应变行为;PAAS在基体中实现了均匀分散,且随着PAAS含量的增加,PVC／PAAS／CMTPV的力学性能呈下降趋势;PVC／PAAS／CMTPV的吸水性能随着PAAs的含量增加而显著提高,且在PAAS加入量为60phr时急剧增加;由于基体的屏蔽作用,PVC／PAAS／CMTPV没有出现明显的溶出现象。     

低硬度CM／EVA TPV的制备及性能

采用动态硫化法制备了氯化聚乙烯橡胶（CM）／乙烯一醋酸乙烯共聚物（EVA）热塑性硫化胶（TPV）,对其力学性能和动态粘弹行为进行了研究。结果表明：在实验范围内,动态硫化CM／EVATPV呈现出典型弹性体软而韧的应力一应变行为,当CM／EVA的共混质量比在80／20～60／40之间时,所制备的低硬度TPV表现出了良好的综合性能。橡胶加工分析仪（RPA）的研究表明,随着扫描频率的增加,CM／EVATPV的储能模量呈线性增长趋势,损耗因子则呈下降趋势;随着应变的增加,TPV表现出明显Payne效应,储能模量发生大幅度下降,损耗因子在应变大于10．O％后急剧增加。     

充油BR/EVA/SBS/HIPS TPV的结构与性能

采用动态硫化法制备了充油顺丁橡胶(BR)/乙烯-醋酸乙烯共聚物(EVA)/苯乙烯-丁二烯-苯乙烯共聚物(SBS)/高抗冲聚苯乙烯(HIPS)共混型热塑性硫化胶(TPV),研究了在树脂相中填充芳烃油对TPV性能和亚微观结构的影响.结果表明,随着芳烃油用量的提高,TPV的硬度、拉伸永久变形、强度均呈显著下降趋势,而拉断伸长...     

Influence of a crosslinked system on the morphology and properties of TPVs based on PA/NBR

The mechanical properties of thermoplastic vulcanizates (TPVs), depend strongly on their morphologies, which themselves depend on the properties of the primary polymers, the composition of the TPV, and the crosslink system and crosslink process. The morphology is defined during the dynamic vulcanization. This work deals with the study of the influence of crosslink systems on TPVs based on PA/NBR (copolyamide PA6/6‐6 and nitrile rubber) in a 40/60 composition. Dicumyl peroxide, bismaleimide, phenolic resin, a sulfur‐accelerated system, and dicumyl peroxide with two coagents were used as crosslinkers. TPVs were characterized by taking into account their mechanical strength, solvent resistance, compression set, and morphology. The curing system constituted by dicumyl peroxide and sulfur/bismaleimide as coagents resulted in a more defined morphology, and therefore the TPV exhibited the best properties. For these TPVs, a morphology consisting of spherical domains of rubber distributed homogeneously on the polyamide matrix could be observed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

EPDM／HDPE热塑性硫化胶的结构与性能研究

采用动态硫化法制备了三元乙丙橡胶（EPDM）／高密度聚乙烯（HDPE）热塑性硫化胶（TPV）,并对其力学性能和微观相结构进行了研究。结果表明。EPDM/HDPE TPV的力学性能随HDPE含量的增加而提高,其应力-应变曲线呈现出典型的弹性体特征;当EPDM／HDPE共混比为60／40时,所制备的TPV表现出了良好的综合性能;EPDM分散相的粒径在1～20μm之间且较均匀地分散于基体中;HDPE连续相在拉伸断裂过程中于断面处形成了成簇的纳米级微纤维;TPV两相结合良好。     

Dynamically vulcanized acrylonitrile–butadiene–styrene terpolymer/nitrile butadiene rubber blends compatibilized by chlorinated polyethylene

Thermoplastic vulcanizates (TPVs) based on acrylonitrile–butadiene–styrene (ABS)/nitrile butadiene rubber (NBR) blends were prepared by dynamic vulcanization and then compatibilized by chlorinated polyethylene (CM). The effects of CM compatibilizer on the mechanical properties, Mullins effect, and morphological and dynamic mechanical properties of the TPVs were investigated systematically. Experimental results indicated that CM had an excellent compatibilization effect on the dynamically vulcanized ABS/NBR TPVs. Mullins effect results showed that the compatibilized ABS/NBR TPV had relatively lower internal friction loss than the ABS/NBR TPV, indicating the improvement of elasticity. Morphology studies showed that the fracture surfaces of ABS/CM/NBR TPVs were relatively smoother, indicating the improved elastic reversibility. DMA studies showed that the glass to rubber transition temperatures of ABS and NBR phases were slightly shifted toward each other with the incorporation of CM compatibilizer, which indicates the improvement of the compatibility. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40986.     

Structure and Properties of Dynamically Cured Thermoplastic Vulcanizate Based on Poly(vinylidene fluoride), Silicone Rubber,and Fluororubber

Thermoplastic vulcanizates (TPVs) based on poly (vinylidene ?uoride) (PVDF), silicone rubber (SR) and ?uororubber (FKM) were prepared via dynamic vulcanization. Morphology characterization showed that spherical rubber particles were dispersed separately and “connected” by “bridge” in the TPV with 10 wt.% FKM, but agglomerated together with higher FKM content. The mechanical properties of TPVs were improved, especially tear strength and elongation increased from 24 kN.m^?1 and 23% to 103 kN.m^?1 and 306%, respectively, with FKM increased from 10 wt.% to 50 wt.%. Rheology studies and dynamic mechanical properties results showed that the compatibility between PVDF and rubber phase was improved by FKM.     

转子转速对乙烯-乙酸乙烯酯共聚物/三元共聚尼龙热塑性硫化胶性能的影响

使用密炼机,采用动态硫化工艺制备了乙烯-乙酸乙烯酯共聚物/三元共聚尼龙热塑性硫化胶（EVM/tPA TPV）和乙烯-乙酸乙烯酯-甲基丙烯酸缩水甘油酯共聚物/三元共聚尼龙热塑性硫化胶（EVM-GMA/tPA TPV）,研究了转子转速对两种热塑性弹性体体力学性能和耐热油等性能的影响。结果表明,在一定范围内提高转子转速,热塑性弹性体的力学性能呈上升趋势,当转子转速为80 r/min时,两种热塑性弹性体的综合力学性能最佳;当转子转速达到60 r/min以上时,两种热塑性弹性体的耐热油性能良好;随着转子转速的增加,两种热塑性弹性体的弹性得到改善;在相同转子转速条件下,EVM-GMA/tPA TPV比EVM/tPA TPV具有更好的力学性能、弹性和耐热油性能。