高密度聚乙烯/聚烯烃弹性体/三元乙丙橡胶热塑性弹性体的结构与性能

采用动态硫化法制备了高密度聚乙烯(HDPE)/三元乙丙橡胶(EPDM)热塑性弹性体(TPV),并在基体中添加聚烯烃弹性体(POE)以改善其性能.对所制得的TPV的力学性能、微观相结构和动态黏弹行为进行了研究.结果表明,当HDPE/EPDM(质量比)为40/60时,HDPE/EPDM TPV表现出良好的综合性能;用POE...     

纳米SiO2对动态硫化EPDM／PP热塑性弹性体性能的影响

在开炼机上采用动态硫化的方法制备纳米SiO2改性三元乙丙橡胶（EPDM）／聚丙烯（PP）共混型热塑性弹性体（TPV）,研究了纳米SiO2的加料顺序和用量对热塑性弹性体的力学性能、维卡软化温度的影响．并对改性后的TPV进行返炼．研究其热塑性能。结果表明：将纳米SiO2先与EPDM混炼均匀．然后加入其它助剂．制得EPDM母炼胶,再与PP共混制备得到的TPV力学性能较好,且纳米SiO2用量为4份时TPV的综合性能最佳;随着纳米SiO2用量的增加,TPV的维卡软化温度升高;返炼后的改性TPV力学性能稍有下降,但具有良好的热塑性。     

POE/EPDM TPV的结构与性能研究

采用动态硫化法制备了聚烯烃弹性体（POE）三/元乙丙橡胶（EPDM）热塑性硫化胶（TPV）,并对其力学性能、微相结构和应力松弛进行了研究。结果表明,POE/EPDM TPV的应力-应变曲线具有典型的弹性体特征;较POE而言,POE/EPDM TPV具有较低硬度和永久形变;EPDM橡胶相的粒径在几微米到几十微米之间,较均匀地分散在POE连续相中;TPV的应力松弛速率随EPDM用量的增加而降低,随应变的增大而加快。     

EPDM／PP／HDPE动态硫化热塑性弹性体力学性能的研究

研究了EPDM／PP／HDPE动态硫化热塑性弹性体中三元乙丙橡胶（EPDM）和高密度聚乙烯（HDPE）对动态硫化热塑性弹性体的力学性能影响。结果表明：EPDM可以改变聚丙烯（PP）和HDPE结晶度,有利于应力的平均分布,使体系的硬度降低。HDPE作为第三相,可以改善PP与EPDM之间的相界面结构,增加体系的相容性。在EPDM／PP橡塑比较低时加入HDPE对体系力学性能影响更明显。     

高密度聚乙烯/硅橡胶热塑性硫化胶的制备与性能

采用动态硫化法制备了高密度聚乙烯（HDPE）/硅橡胶（MVQ）热塑性硫化胶（TPV）,考察了HDPE与MVQ的质量比及压片工艺对TPV的硫化特性、力学性能及表面亲疏水性能的影响。结果表明,随着MVQ用量的增加,TPV的动态硫化程度逐渐升高。随着压片时间的延长,TPV的拉伸强度、撕裂强度和扯断伸长率均大幅提高。随着MVQ用量的增加,TPV与水的接触角逐渐增加,相应的表面张力逐渐减小。     

三元乙丙橡胶/聚丙烯体系动态硫化速率及热塑性弹性体定伸应力的影响因素

采用转矩流变仪制备了动态硫化三元乙丙橡胶（EPDM）/聚丙烯（PP）热塑性弹性体（TPV）,考察了EPDM/PP共混物的硫化速率及TPV定伸应力的影响因素。结果表明,提高混炼温度、转速及减少EPDM充油量可以提高硫化速率,当混炼温度为195℃、转速为50 r/min、充油质量分数为30%时,TPV的定伸应力达到最大值;随着低双键含量的EPDM（LEPDM）含量的增加,EPDM/PP共混物的硫化速率和TPV的定伸应力逐渐减小,当LEPDM质量分数达到60%时,硫化速率和定伸应力趋于稳定。     

高密度聚乙烯/氯磺化聚乙烯热塑性动态硫化 弹性体的性能研究

将高密度聚乙烯（HDPE）与氯磺化聚乙烯（CSM）共混制备热塑性动态硫化弹性体（TPV）,并采用高密度聚乙烯接枝马来酸酐（HDPE-g-MAH）作为相容剂来改善HDPE与CSM的相容性,研究HDPE/CSM共混比和HDPE-g-MAH用量对TPV性能的影响。结果表明：随着CSM用量的增大,TPV的力学性能先降低后提高,玻璃化温度（Tg）升高,阻燃性能改善;添加HDPE-g-MAH后,TPV的力学性能提高,Tg降低,HDPE与CSM的相容性较好,CSM粒子在体系中分散更均匀,TPV的拉伸断面更平整。     

阻燃EPDM/PP TPV的研究

研究制备工艺和阻燃剂用量对EPDM／PP阻燃热塑性硫化胶（TPV）性能的影响。结果表明，采用十溴联苯醚（FR-10）／三氧化二锑并用阻燃体系，阻燃剂在动态硫化前加入，EPDM／PPTPV的阻燃性能较好，但物理性能稍差，阻燃剂用量较大时，EPDM／PPTPV的阻燃性能较好，但拉伸强度减小；采用FR—10／三氧化二锑／氢氧化镁并用阻燃体系，氢氧化镁在动态硫化前加入，EPDM／PPTPV的阻燃性能稍好，物理性能和挤出外观质量略差，氢氧化镁用量对EPDM／PPTPV的阻燃性能影响不大。采用FR—1O／三氧化二锑／氢氧化镁并用阻燃体系，氢氧化镁在动态硫化前加入，可制备低硬度阻燃低发烟EPDM／PP TPV。     

天然橡胶/乙烯-乙酸乙烯酯共聚物/高密度聚乙烯热塑性硫化胶的制备及其性能研究

制备天然橡胶（NR）/乙烯-乙酸乙烯酯共聚物（EVA）/高密度聚乙烯（HDPE）热塑性硫化胶（TPV）并研究其性能。结果表明：当动态硫化时间为8 min、EVA用量为12份、炭黑N330用量为40份时，NR/EVA/HDPE TPV的综合物理性能最好。     

EPDM/PP动态硫化热塑性弹性体的研制及应用

根据粘度相近共混原则，通过（乙烯／丙烯／二烯）共聚物（EPDM）充油、筛选高流动性的粉状聚丙烯（PP）、添加超细活性滑石粉等方法，使EPDM与PP充分均匀分散；采用动态硫化法在单螺杆挤出机组上制备了完全交联的EPDM／PP共混型热塑性弹性体（TPV）；用SEM、力学测试、布拉本流变仪等实验方法，探讨了TPV的配方组成、工艺条件与性能的关系；摸索了TPV的加工性；研究了TPV对PP的增韧效果，发现TPV能大大改善PP的综合性能。     

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。     

用于交通信号标识制品的聚丙烯合金的研制

以PP为基体，加入EPDM和HDPE，采用动态硫化技术，制得了可用于交通信号标识制品的PP合金，并分别对材料的力学性能、热性能和加工流动性进行了评估。实验表明，PP／HDPE／EPDM能很好地改善PP的低温脆性，是制造交通信号标识制品的理想材料。     

Thermoplastic elastomers based on high‐density polyethylene,ethylene–propylene–diene terpolymer,and ground tire rubber dynamically vulcanized with dicumyl peroxide

Thermoplastic vulcanizates (TPVs) based on high‐density polyethylene (HDPE), ethylene–propylene–diene terpolymer (EPDM), and ground tire rubber (GTR) were dynamically vulcanized with dicumyl peroxide (DCP). The polymer blend was composed of 40% HDPE, 30% EPDM, and 30% GTR, and the concentration of DCP was varied from 0.3 to 3.6 parts per hundred rubber (phr). The properties of the TPVs were determined by evaluation of the gel fraction content and the mechanical properties. In addition, IR spectroscopy and differential scanning calorimetry analysis were performed as a function of the DCP content. Decreases in the Young's modulus of the blends and the crystallinity of HDPE were observed when the content of DCP was greater than 1.8 phr. The results regarding the gel content indicate that the presence of DCP promoted the crosslinking of the thermoplastic matrix, and optimal properties were obtained with 1.5% DCP. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39901.     

HDPE增韧PP-R/石墨复合材料力学性能的研究

采用高密度聚乙烯(HDPE)为增韧剂、乙烯 丙烯 二烯三元共聚物(EPDM)、乙烯 辛烯共聚物(POE)为相容剂、石墨为功能性助剂制备了以无规共聚聚丙烯(PP R)或嵌段共聚聚丙烯(PP B)为基体的PP R或PP B／HDPE／石墨复合材料。详细研究了HDPE含量、弹性体种类及含量对PP R或PP B／HDPE／石墨复合材料力学性能的影响。结果表明HDPE用量在20%、EPDM含量为5%时,PP R或PP B复合材料力学性能优异;POE可以实现PP R或PP B／HDPE／石墨复合材料力学性能的平衡。     

聚烯烃改性PET的研究

通过PET与PP、HDPE、EPDM挤出共混，注射模塑制得试样。经DTA、SEM和力学性能测试，表征了共混体系的热行为、结构形态和力学性能。结果表明，在PET/PP(EPDM、HDPE)共混体系中，加入少量的PP-g-MI(EPDM-g-MAH、PE-g-MI)，可较好地改善PEt与PP(EPDM、HDPE)之间的相容性，使分散相在PET基体连续相中分散均匀，分散相尺寸减小，增加了两相间界面的粘结力；同时对PET的结晶有较强的促进作用，使其冷结晶温度降低，改善了PET的加工性能；并且能大幅度提高共混物的冲击强度。     

Effect of dicumyl peroxide and phenolic resin as a mixed curing system on the mechanical properties and morphology of TPVs based on HDPE/ground tire rubber

Thermoplastic vulcanizates (TPVs) are a special group of thermoplastic elastomer with the characteristic that consists of rubber elasticity and the processability of thermoplastic polymers. TPVs based on high density polyethylene (HDPE)/ground tire rubber (GTR) with phenolic resin (HY‐2045) and dicumyl peroxide (DCP) as vulcanizing agents are prepared through dynamic vulcanization in this article. The blends consisting of 40/60 HDPE/GTR are melt‐mixed in an internal mixer and then pressed with a compression molding machine. The aim of this experiment is to study the influence of a compound curing agent system on the mechanical properties of the HDPE/GTR composites. The results indicate that the mechanical properties of the HDPE/GTR blends are improved significantly by adding 4 phr HY‐2045 and 0.3 phr DCP than those of TPVs without any vulcanizing agents after dynamic vulcanization. The X‐ray photoelectron spectroscopy study and the FTIR‐ATR analysis confirmed that the crosslinking phenomenon occurred in the preparation of TPVs; and the gel fraction analysis indicates that the GTR components and the HDPE components of the HDPE/GTR blends are all moderately crosslinked. In addition, the morphology of the HDPE/GTR blends has been investigated by scanning electron microscopy. POLYM. COMPOS., 36:1907–1916, 2015. © 2014 Society of Plastics Engineers     

Influence of phenolic curative on crosslink density and other related properties of dynamically cured NR/HDPE blends

Dynamically cured 60/40 NR/HDPE blends with various amounts of phenolic curative were prepared in an internal mixer at 160°C. A simple blend (i.e., the blend without curative) was also prepared using the same materials and blend proportion for comparison purposes. Mechanical, dynamic, and morphological properties; swelling resistance and crosslink density of the blends were investigated. It was found that the thermoplastic vulcanizates (TPVs) gave superior mechanical and dynamic properties than the simple blend. Furthermore, the mechanical properties in terms of elongation at break, modulus and tensile strength and elastic response in dynamic test in terms of storage modulus increased with increased loading amount of the curative. The complex viscosity also increased but the tan δ and tension set decreased with increased loading level of the curative. The crosslink density of the TPVs was estimated based on the elastic shear modulus. It was found that the crosslink density of the blends increased with increased loading levels of the curative while the degree of swelling decreased. This correlated well with the trend of mechanical and dynamic properties. SEM micrographs were used to confirm the level of mechanical and dynamic properties. It was found that the simple blend at a given blend ratio exhibited co‐continuous phase morphology. However, the TPVs showed micron scale of vulcanized rubber domains dispersed in a continuous HDPE matrix. The size of vulcanized rubber domains decreased with increasing amounts of the curative. This led to greater interfacial adhesion between the phase and hence superior mechanical and dynamic properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

EPDM/POE动态硫化热塑性硫化胶的性能与结构

采用动态硫化法制备EPDM/聚烯烃弹性体(POE)热塑性硫化胶(TPV),研究共混温度和硫化体系配比对其性能的影响,并对其形态结构进行表征.结果表明:随着共混温度的升高和硫化体系用量的增大,共混体系的硫化速率逐渐加快;TPV的拉伸强度和拉断伸长率在共混温度为150℃左右时达到最大,拉断伸长率随着硫化体系用量的增大而减小,而拉伸强度则先减小后略有增大;随着共混温度的升高和硫化体系用量的增大,TPV撕裂强度呈现先增大后减小趋势;当硫黄用量为0.2份时,体系出现了明显的Payne效应,EPDM交联相以平均粒径为1μm左右的颗粒状态分散于POE连续相中.