磷酸盐基（苯乙烯-丁二烯-苯乙烯）嵌段共聚物离聚体的结构、性能及应用

由环氧化的苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)与磷酸氢二钠通过开环反应制备了含磷酸二钠基的SBS离聚体(PSBS),研究了PSBS的形态结构、混炼胶力学性能的影响因素、PSBS/聚丙烯(PP)共混物的力学性能以及PSBS对SBS/氯醚橡胶(CHR)共混物的增容作用.结果表明,磷酸盐基SBS离聚体呈大小不一、形状不规则的离子微区;当硬脂酸锌用量为PSBS质量分数的10%、离子基团含量为0.95 mmol/g时,PSBS混炼胶的力学性能最佳,且呈现热塑性弹性体行为;PSBS与PP共混,其拉伸强度与组成呈现协同效应,且耐甲苯性提高;PSBS可作为SBS/CHR共混物的增容刺,其最佳质量分数为3%,离聚体的加入有助于改善共混物的耐油性和相客性.     

磺酸钠基苯乙烯-丁二烯-苯乙烯嵌段共聚物离聚体的力学性能及其应用

由环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)与NaHSO3开环反应合成了磺酸钠基SBS离聚体。研究了离聚体力学性能的影响因素、离聚体对SBS/氯醇橡胶(CHR)的增容作用、质量比对离聚体/聚丙烯(PP)共混物性能的影响。结果表明:硬脂酸锌能提高离聚体的力学性能;随着离聚体离子含量的增加,拉伸强度及扯断伸长率增加。加入少量离聚体,使离聚体/CHR共混物的力学性能提高,扫描电镜显示两者的相容性增加;离聚体与PP共混,在拉伸强度方面呈现协同效应。质量比各为1/1的离聚体增容SBS/CHR和离聚体/PP共混物的耐油性均较SBS大为改善。     

硫酸盐基离聚体的形态结构、力学性能及其共混

由环氧化（苯乙烯-丁二烯-苯乙烯）三嵌段共聚物（SBS）与硫酸氢钠水溶液反应制备了新型含硫酸盐基的SBS离聚体，研究了离聚体的形态结构、力学性能、离聚体时SI玛／氯醇橡胶（CHR）共混物的增容作用以及离聚体／聚丙烯（PP）共混物的力学性能。结果表明：在透射电镜下硫酸铅基离聚体呈现黑色圆柱状或四方晶形离子微区，硬脂酸锌作为离子增塑剂能提高钠离聚体的力学性能；随着离子基含量的提高，离聚体的拉伸强度及扯断伸长率增加；少量离聚体可以提高SBS／CHR共混物的力学性能，减小共混物的吸煤油率；扫描电镜图片显示二者的相容性增加；离聚体／PP共混物在拉伸强度与组成的关系方面呈现协同效应，并且其耐甲苯性能提高。     

用环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物制备和表征离聚体

利用环氧化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)的环氧基与顺丁烯二酸氢钾在相转移催化剂及二甲基苯胺存在下开环反应制得钾离聚体。研究了其反应条件,得到了环氧基的最大转化率达65％,并用红外光谱确定其为离聚体。     

新型两亲性顺丁橡胶硫酸盐离聚体及其在共混中的增容作用(英文)

通过环氧化顺式1,4-聚丁二烯与硫酸氢钠开环反应制备了新型顺丁橡胶硫酸盐离聚体,该离聚体呈现较高的吸水性及突出的乳化性,并能作为氯醚橡胶(CHR)/苯乙烯-丁二烯一苯乙烯嵌段共聚物(SBS)共混物的增容剂.用透射电子显微镜研究了新型顺丁橡胶硫酸盐离聚体的形态,并用扫描电子显微镜分析了离聚体在共混中的增容原因.结果表明,离聚体中存在着黑色纳米级离子微区;离聚体明显改善了CHR与SBS两相界面作用.     

两亲性硫酸钾基(苯乙烯-丁二烯-苯乙烯)嵌段共聚物离聚体的合成、表征及其性能

以四乙基溴化铵(TEAB)为相转移催化剂、N,N-二甲基苯胺(DMA)为开环催化剂,环氧化(苯乙烯-丁二烯-苯乙烯)嵌段共聚物(ESBS)甲苯溶液与硫酸氢钾(PBS)水溶液通过开环反应制备了硫酸钾基(苯乙烯-丁二烯-苯乙烯)嵌段共聚物离聚体(SSBS),考察了合成条件对ESBS开环反应的影响,用傅里叶变换红外光谱法表征了SSBS,研究了SSBS的耐溶剂性能、特性黏数[η]及乳化性能.结果表明,当TEAB/ESBS(质量比)为5%、DMA/ESBS(质量比)为5%、ESBS溶液质量浓度为0.12 g/mL、PBS与环氧基的摩尔比为1.8、反应温度为75 ℃、反应时间为7 h时,ESBS的开环率达到41.7%;开环反应过程中同时形成了硫酸盐基和羟基;随着离子基团含量及离子电位的增加,SSBS的吸水率和[η]增大,耐油性能增强;SSBS能乳化甲苯/水体系,其乳化体积随着离子含量、离聚体用量及离子电位的增加而增大.     

阳离子对顺酐化苯乙烯-丁二烯-苯乙烯三嵌段共聚物离聚体性能的影响

将顺酐化苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)离子化得到含不同阳离子的离聚体,考察了不同阳离子对离聚体热性能、物理机械性能、耐油性能和粘接性能的影响.结果表明,离聚体有3个玻璃化转变温度(Tg),其中2个是SBS固有的Tg,另一个是离子微区的离解温度;对于含1价阳离子的离聚体,离子电离势越高,离聚体的离解温度、拉...     

聚烯烃离聚体原位增容PP/LLDPE共混物的研究!

用傅立叶红外光谱(FTIR)、力学性能测试等方法研究了聚烯烃离聚体原位增容聚丙烯/线性低密度聚乙烯(PP/LLDPE)共混物。结果表明:熔融状态下,在马来酸酐接枝聚丙烯/马来酸酐接枝线性低密度聚乙烯(PP-g-MAH/LLDPE-g-MAH)(质量比50/50)共混物中加入二水醋酸锌,共混物中的马来酸酐基团(羧酸基团)与Zn2+发生离子偶联反应,相界面就地产生的聚烯烃离聚体增加了两相界面黏合力,共混物力学性能提高;原位增容后共混物中的PP和LLDPE相熔点略微下降,LLDPE结晶温度向高温移动;在角频率为0.01～100.00s-1,原位增容后共混物的储能模量、损耗模量和复数黏度都高于简单共混物的,损耗正切(tanδ)低于简单共混物的;对于PP/PP-g-MAH/LLDPE/LLDPE-g-MAH四元体系,SEM显示原位增容后共混物的相界面变得模糊,相容性提高。     

PP/PS/SBS共混物的性能研究

通过添加聚苯乙烯(PS)、热塑性弹性体苯乙烯-丁二烯-苯乙烯共聚物(SBS),以改善聚丙烯(PP)的性能。先采用熔融法制备PP/PS共混物,在确定PP,PS最佳配比的基础上,再添加SBS制备PP/PS/SBS共混物,确定了PP,PS及SBS的最佳配比。研究了PP/PS,PP/PS/SBS共混物的力学性能、热性能及熔体流动行为。结果表明,当PP与PS的质量比为70∶30时,PP/PS共混物的性能最好,其拉伸强度为28.5 MPa,拉伸弹性模量为1 214 MPa,弯曲弹性模量为1 752 MPa,冲击强度为14.0 kJ/m2,断裂应变为130%,维卡软化温度为143.9℃。当PP,PS及SBS的质量比为70∶30∶10时,PP/PS/SBS共混物的性能最好,其拉伸强度为23.2 MPa,拉伸弹性模量1 040 MPa,断裂应变为260%,冲击强度为18.0 kJ/m2,弯曲强度为36.5 MPa,弯曲弹性模量为1 297 MPa,定挠度弯曲应力为36.1 MPa,弯曲破坏应力为36.5 MPa,熔体流动速率为8.94 g/(10 min),维卡软化温度为139.0℃。     

含顺丁烯二酸钾基的顺丁橡胶离聚体的合成、表征与性质

用环氧化顺丁橡胶在甲苯中与顺丁烯二酸氢钾水溶液以N，N-二甲基苯胺和四乙基溴化铵为催化剂进行反应，合成了含顺丁烯二酸钾基的顺丁橡胶离聚体，研究了其开环反应条件。结果表明：开环率可以达到34．2％；该离聚体具有一定的乳化性、吸水性、耐油性；其稀溶液粘度随离子含量的增加而增大；其作为增容剂能增加SBS和氯醇橡胶的相容性。     

Synthesis and properties of novel amphiphilic sulfated ionomers by the ring‐opening reaction of an epoxidized styrene–butadiene–styrene triblock copolymer

A method for the synthesis of novel sulfated ionomer of styrene–butadiene–styrene triblock copolymer (SBS) was developed. SBS was first epoxidized by performic acid in the presence of a phase‐transfer catalyst; this was followed by a ring‐opening reaction with an aqueous solution of alkali salt of bisulfate. The optimum conditions for the ring‐opening reaction of the epoxidized SBS with an aqueous solution of KHSO₄ were studied. During the ring‐opening reaction, both phase‐transfer catalyst and ring‐opening catalyst were necessary to enhance the conversion of epoxy groups to ionic groups. The products were characterized with Fourier transform infrared spectrophotometry and transmission electron microscopy (TEM). After the potassium ions of the ionomer were substituted with lead ions, the lead sulfated ionomer exhibited dark spots under TEM. Some properties of the sulfated ionomer were studied. With increasing ionic groups or ionic potential of the cations, the water absorbency and emulsifying volume of the ionomer and the intrinsic viscosity of the ionomer solution increased, whereas the oil absorbency decreased. The sulfated ionomer possessed excellent emulsifying properties compared with the sulfonated SBS ionomer. The sodium sulfated ionomers in the presence of 10% zinc stearate showed better mechanical properties than the original SBS. When the ionomer was blended with crystalline polypropylene, a synergistic effect occurred with respect to the tensile strength. The ionomer behaved as a compatibilizer for blending equal amounts of SBS and oil‐resistant chlorohydrin rubber. In the presence of 3% ionomer, the blend exhibited much better mechanical properties and solvent resistance than the blend without the ionomer. SEM photographs indicated improved compatibility between the two components of the blend in the presence of the ionomer. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Novel method for preparation of quaternary ammonium ionomer from epoxidized styrene–butadiene–styrene triblock copolymer and its use as compatibilizer for blending of styrene–butadiene–styrene and chlorosulfonated polyethylene

A novel method for the preparation of a quaternary ammonium ionomer of styrene–butadiene–styrene triblock copolymer (SBS) was developed by a ring‐opening reaction of epoxidized SBS with triethylamine hydrochloride in the presence of a phase transfer catalyst. The optimum conditions were studied. The ionomer was characterized by quantitative analysis, IR spectroscopy, and ¹H‐NMR spectroscopy. Its water absorbency, oil absorbency, dilute solution viscosity, and use as a compatibilizer for the blending of SBS and chlorosulfonated polyethylene (CSPE) were investigated. The results showed that, under optimum conditions, the epoxy groups can be completely converted to the quaternary ammonium groups. The IR spectrum did not exhibit the absorption peak for quaternary ammonium groups, whereas the ¹H‐NMR spectrum and titration method demonstrated it. With increasing ionic group content, the water absorbency of the ionomer increased whereas its oil absorbency decreased. These indicated the amphiphilic character of the SBS ionomer. The dilute solution viscosity of the ionomer in toluene/methanol (9/1) solvent increased with increasing quaternary ammonium group content. The ionomer was used as a compatibilizer for the blends of SBS and CSPE. The addition of a small amount of the ionomer to the blend enhanced the mechanical properties of the blends: 2 wt % ionomer based on the blend increased the tensile strength and ultimate elongation of the blend nearly 2 times. The blends of equal parts SBS and CSPE behaved as oil‐resistant thermoplastic elastomers. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1975–1980, 2006     

Behavior of ionomers of sulfonated styrene–butadiene–styrene triblock copolymer in polymer blends with crystalline polyolefins and as compatibilizer

The blends of ionomers of sulfonated (styrene–butadiene–styrene) triblock copolymer with two polyolefins as well as the blends of polystyrene (PSt) with two polar, oil‐resistant elastomers, i.e., chlorohydrin rubber (CHR) and chlorosulfonated polyethylene (CSPE), using the ionomer as compatibilizer were studied. The blends of the ionomer with polypropylene or high density polyethylene showed synergistic effects with respect to tensile strength. With increasing PSt content, the blends change their behavior from thermoplastic elastomer to toughened plastics. The synergism is probably because of the thermoplastic interpenetrating polymer networks formed in the blend. The blends exhibited high resistance against diesel oil or toluene. When PSt was blended with CHR or CSPE using the ionomer as compatibilizer, only 2 or 3% ionomer was needed to enhance the mechanical properties of the blends. The effect is due to the ion–polar interaction of the ionomer with the polar polymer. The enhanced compatibility of the blends by the ionomer was demonstrated by DSC and Scanning electron micrograph. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1887–1894, 2006     

不同金属离子及胺中和的磺化丁基橡胶离聚体的性能

研究了不同金属离子及胺中和的磺化丁基橡胶离聚体的熔融流动性及力学性能。结果表明,随着硬脂酸锌加入量的增加,锂离聚体的熔融黏度降低,拉伸强度增大;随离聚体中磺酸基含量的增加,锂离聚体的熔融黏度和拉伸强度增大。对于一价金属离子中和的离聚体,其熔融黏度及拉伸强度随着离子电位的降低而减小;对于二价金属离子中和的离聚体,随着离子电位的下降及共价性的增加,熔融黏度下降而拉伸强度增大。用胺中和的离聚体,硬脂酸锌的影响较小,未加硬脂酸锌的离聚体具有较高的扯断伸长率及较低的永久变形,是良好的热塑性弹性体;随离聚体中磺酸基含量的增加,乙胺离聚体的拉伸强度增大。对于不同胺中和的离聚体,其拉伸强度按下列顺序依次降低：乙胺,三乙胺,二乙胺;乙胺,己胺,十二胺,十八胺。     

Effect of styrene–isoprene–styrene,styrene–butadiene–styrene,and styrene–butadiene–rubber on the mechanical,thermal, rheological,and morphological properties of polypropylene/polystyrene blends

The mechanical, thermal, rheological, and morphological properties of polypropylene (PP)/polystyrene (PS) blends compatibilized with styrene–isoprene–styrene (SIS), styrene–butadiene–styrene (SBS), and styrene–butadiene–rubber (SBR) were studied. The incompatible PP and PS phases were effectively dispersed by the addition of SIS, SBS, and SBR as compatibilizers. The PP/PS blends were mechanically evaluated in terms of the impact strength, ductility, and tensile yield stress to determine the influence of the compatibilizers on the performance properties of these materials. SIS‐ and SBS‐compatibilized blends showed significantly improved impact strength and ductility in comparison with SBR‐compatibilized blends over the entire range of compatibilizer concentrations. Differential scanning calorimetry indicated compatibility between the components upon the addition of SIS, SBS, and SBR by the appearance of shifts in the melt peak of PP toward the melting range of PS. The melt viscosity and storage modulus of the blends depended on the composition, type, and amount of compatibilizer. Scanning electron microscopy images confirmed the compatibility between the PP and PS components in the presence of SIS, SBS, and SBR by showing finer phase domains. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 266–277, 2003     

Preparation,characterization, and some properties of ionomers from a sulfonated styrene–butadiene–styrene triblock copolymer without gelation

The conditions for the sulfonation of a highly unsaturated styrene–butadiene–styrene triblock copolymer (SBS) in cyclohexane containing a small amount of acetone with acetyl sulfate made by sulfuric acid and acetic anhydride without gelation were studied. After neutralization with metallic ions, the ionomers were characterized with IR spectrophotometry, dynamic mechanical analysis, and transmission electron microscopy. The melt flow, solution properties, and mechanical properties of the ionomers were studied. The results showed that gelation occurred during the sulfonation of SBS in cyclohexane at a 5–10% concentration without acetone, whereas in the presence of 5–10 vol % acetone, sulfonation proceeded smoothly without gelation. Transmission electron microphotographs of the lead ionomer indicated the presence of ionic domains. A dynamic mechanical spectrum showed the presence of three transition temperatures: ?82.9, 68, and 96.5°C. The melt viscosity of the ionomer increased with the sulfonate content. The melt viscosity of the different ionomers neutralized with different cations seemed to decrease with decreasing ionic potential for both monovalent cations and divalent cations The solution viscosity of the sodium‐sulfonated ionomer increased with increasing sulfonate content. The ionomer still behaved as a thermoplastic elastomer and showed better mechanical properties than the original SBS. The tensile strength of the different ionomers decreased as follows. For the monovalent cations, it decreased with decreasing ionic potentials: Li⁺ > Na⁺ > K⁺. For the divalent cations, it decreased with increasing ionic potentials: Pb²⁺ > Zn²⁺ > Mg²⁺. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 1398–1404, 2005     

Synthesis and characterization of maleated ionomers via ring‐opening reaction of epoxidized styrene‐butadiene rubber with potassium hydrogen maleate and study of their behavior as compatibilizer

A novel method for synthesizing maleate ionomer of (styrene‐co‐butadiene) rubber (SBR) from epoxidized SBR was developed. The epoxidized SBR was prepared via epoxidation of SBR with performic acid formed in situ by H₂O₂ and formic acid in cyclohexane. The maleated ionomer was obtained by ring‐opening reaction of the epoxidized SBR solution with an aqueous solution of potassium hydrogen maleate. The optimum conditions were studied. It was found that it is necessary to use phase transfer catalyst and ring‐opening catalyst for enhancing the epoxy group conversion. To obtain 100% conversion addition of dipotassium maleate is important. The product was characterized by FTIR spectrophotometry and transmission electron microcroscopy (TEM). The results showed that the product was really an ionomer with domains of maleate ionic groups. Some properties of the ionomer, such as water absorbency, oil absorbency and dilute solution behavior were studied. With increasing ionic groups, the water absorbency of the ionomer increases, whereas the oil absorbency decreases. The dilute solution viscosity of the ionomer increases abruptly with increasing ionic group content. The ionomer can be used as a compatibilizer for the blends of SBS and chlorosulfonated polyethylene (CSPE). Addition of a small amount of the ionomer to the blend can enhance the mechanical properties of the blends. 3 wt % ionomer based on the blend can increase the tensile strength and ultimate elongation of the blend nearly twice. The compatibility of the blends enhanced by adding the ionomer was shown by scanning electron microscopy. The blend of equal parts of SBS and CSPE compatibilized by the ionomer behaves as an oil resistant thermoplastic elastomer. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 792–798, 2006