苯乙烯-马来酸酐无规共聚物改性研究

以甲苯为溶剂、偶氮二异丁腈为引发剂,通过沉淀聚合法制备了苯乙烯-马来酸酐共聚物,并测定共聚物中酸酐的含量。以丙酮为溶剂,对甲苯磺酸为催化剂,在苯乙烯-马来酸酐共聚物中加入聚氧乙烯醚改性剂,回流条件下合成了以苯乙烯-马来酸酐为主链,聚氧乙烯醚链为侧链的改性聚合物,使用傅立叶红外光谱对其结构进行表征。     

苯乙烯-马来酸酐共聚物十六醇改性研究

用十六醇对苯乙烯-马来酸酐共聚物进行改性,合成得到了苯乙烯-马来酸十六醇酯共聚物。由实验结论可知：苯乙烯-马来酸十六醇酯共聚物的耐热性及耐水性较优良,并具有一定的生物降解性,但生物降解性随时间延长而降低。     

苯乙烯-马来酸酐共聚物阳离子化改性及其在颜料分散中的应用

采用环氧丙基三甲基氯化铵(ETA),通过界面反应对苯乙烯-马来酸酐共聚物(SMA)进行改性,制备高分子分散剂(SMG)。红外光谱测试结果表明,ETA和SMA中酸酐发生反应,生成了酯键,当ETA对SMA摩尔比为1.3、对甲苯磺酸占SMA总质量的14%、反应时间6 h、反应温度78℃时,SMG阳离子化度为30.96%。应用实验表明,SMG对炭黑的分散效果明显优于SMA,当SMG阳离子度大于14%、pH=9、SMG对颜料的质量分数为7%时,制备炭黑分散体粒径为170 nm,炭黑分散体热稳定性较佳,60℃处理24 h,粒径变化率仅为3.6%。所制备分散体在pH=3时,炭黑Zeta电位为+28.61 mV,当pH>6.5后,Zeta电位变为负值,表现出两性特征。     

苯乙烯-马来酸酐共聚物的酯化改性及其对炭黑的分散性能

采用异丁醇对苯乙烯-马来酸酐共聚物(SMA)进行酯化改性,研究了反应温度、时间、催化剂用量、异丁醇用量等因素对共聚物酸值的影响。红外光谱测试表明,SMA中酸酐与异丁醇发生了酯化反应。在以丁酮为反应溶剂,SMA质量占反应体系总质量的5%,异丁醇质量占反应体系总质量的12%,对甲苯磺酸质量占SMA质量的1%,反应温度80℃,反应时间4 h的条件下,SMA部分酯化物(SME)的酸值降低到了271.6 mg KOH/g。炭黑分散研究结果表明,SME对炭黑分散效率优于SMA,当SME酸值低于355.1 mg KOH/g,其用量为炭黑质量的20%,pH=9时,制备炭黑分散体平均粒径为154 nm,制备的炭黑分散体表现出良好的离心稳定性。     

苯乙烯—马来酸酐无规共聚物中酸酐含量的测定

对苯乙烯(St)-马来酸酐(MAH)无规共聚物(SMA)中MAH及马来酸含量的分析方法作了较为详细的研究,确定了一种新的分析方法,即以丁酮为溶剂,加入水解催化剂及水,用KOH-乙醇溶液滴定至终点,测得总酸值(B);以丁酮为溶剂,用KOH-乙醇溶液直接滴定,测得总酸值(A)。样品中MAH质量含量等于(B-A)×MAH分子质量(M_(MAH))×10~(-1),马来酸质量含量等于(A-B/2)×马来酸分子质量(M_(马来酸))×10~(-1)。由滴定分析结果证实了这种分析方法是可行的。     

酯化改性苯乙烯马来酸酐共聚物及其盐的制备与应用

采用聚醚对苯乙烯马来酸酐共聚物(SMA)进行酯化改性,再使用胺中和部分剩余羧酸得到苯乙烯马来酸酐酯化及中和产物(SMAE-N)。并对不同的催化剂种类及其用量、不同的溶剂种类以及不同的反应温度、时间等因素对酯化率的影响进行探究。考察了反应过程中酸值变化,对酯化产物使用核磁共振氢谱(H-NMR)与傅里叶红外光谱(FT-IR)进行结构表征。同时探索了不同种类的聚醚和胺对钛白粉、炭黑等颜料分散性能的影响。结果表明,当溶剂使用乙酸丁酯、固体酸催化剂DP91,且用量为反应物质量分数的1%,苯乙烯马来酸与聚醚1007投料物质的量比为1∶4,115℃情况下反应5 h,酯化率可达到62.84%,再用三乙胺中和剩余羧酸的70%。颜料分散应用结果表明,SMAE-N对钛白粉、炭黑等颜料具有显著的分散效果。     

绿色溶剂中苯乙烯-马来酸酐无规共聚物的合成及表征

使用绿色溶剂碳酸二甲酯(DMC)代替传统溶剂丙酮,在120℃、苯乙烯与马来酸酐配比为9:1及氮气环境下,以溶液聚合法制备了苯乙烯-马来酸酐无规共聚物(R-SMA),通过红外光谱、核磁共振、化学滴定等表征方法确证产物为R-SMA,并研究了两种溶剂及其用量对R-SMA组成、结构、分子量、转化率等的影响。结果表明:DMC作溶剂时,R-SMA以苯乙烯作为分子主链,其中SSM、MSS、MSM三种结构在分子链中随机分布,呈无规排列;随着DMC用量的增加,R-SMA的分子量降低,转化率先升高后降低,马来酸酐含量变化不大;与丙酮作溶剂相比,DMC作溶剂时,产物的分子量及马来酸酐含量均较低,耐热性更好。     

苯乙烯——马来酸酐共聚物及其合金

介绍苯乙烯－马来酸酐共聚物的性能与应用，着重介绍它与尼龙，苯乙烯－丙烯腈共聚物，ＡＢＳ、ＰＣ、橡胶弹性体，ＰＶＣ及ＰＢＴＰ等的合金的研究开发状况，该共聚物与上述高聚物的相容性良好，能改善尼龙的吸湿性和尺寸稳定性，赋予其它树脂高耐热性及优异的加工性能。     

苯乙烯——马来酸酐共聚物的合成及应用

本实验采用沉淀聚合的方法，合成甲醇酯化的交替型乙烯－马来酸酐共聚物，经在合成无碳复写纸用微胶囊方面的应用表明，该共聚物的碱水溶液具有较好的乳化分散稳定效果。     

改性苯乙烯-马来酸酐共聚物乳化剂用于乳液聚合的研究

以十二醇为原料,通过酯化反应对苯乙烯-马来酸酐共聚物(SMA-1000P)进行改性。采用所制备的改性苯乙烯-马来酸酐共聚物作为乳化剂,制备了具有核壳结构的丙烯酸酯聚合物乳胶粒子,研究了乳液合成中乳化剂的酯化程度、乳化剂用量、引发剂的浓度、单体和引发剂滴加时间对乳液粒径、凝胶量等的影响,并利用红外(FT-IR)、纳米激光粒度仪(DLS)、透射电镜(TEM)进行一系列的表征。结果表明:SMA-1000P与十二醇质量比为1∶0.75时可获得性能最佳的乳化剂。TEM观察到的乳液粒径大小及分布趋势与DLS测得的结果一致,同时也证明了核壳结构的存在。     

SMA工业生产计量及分析方法

运用密度法建立了可用于苯乙烯－马来酸酐共聚物（SMA）工业生产听密度－温度－浓度关系式。应用表明，此式在工业生产计量仪表的标定中是可信和可靠的。利用工业生产获得了有关工艺参数，还建立了针对SMA生产的反应器方程式。经20d连续工业生产考察表明，用反应器方式式所预测的转化率与实际值非常吻合，该方程式具有指导SMA工业生产的意义。     

Synthesis and characterization of solid‐phase graft copolymer of polypropylene with styrene and maleic anhydride

Polypropylene (PP) was modified by solid‐phase graft copolymerization with maleic anhydride (MAH) and styrene (St), using benzoyl peroxide as the initiator and xylene as the interfacial agent. Effects of various factors such as monomer concentration, monomer ratio, initiator concentration on grafting percentage, and acid value were investigated. The graft copolymer was characterized by Fourier transform infrared, pyrolysis gas chromatography—mass spectroscopy, and dynamic mechanical analysis, and the intrinsic viscosity of the extractive from the reaction product was investigated. The results showed that the grafting percentage and acid value of the graft copolymer of PP with two monomers (MAH and St) were considerably higher than those of the graft copolymer of PP with MAH alone. The graft segments were shown to be the copolymer of St and MAH with a substantial molecular weight. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2482–2487, 2000     

马来酸酐熔融接枝二元乙丙橡胶的研究

在转矩流变仪中,以过氧化二异丙苯(DCP)为引发剂,采用多单体熔融接枝技术,研究了二元乙丙橡胶(EPM)熔融接枝马来酸酐(MAH),考察了MAH含量、DCP用量、反应温度、反应时间、转子转速以及第二单体苯乙烯(St)的用量对接枝反应的影响,并用红外光谱(FTIR)对接枝产物进行了表征.研究结果表明:对于EPM-g-MAH体系,MAH和DCP最佳用量分别为3.0 phr和0.22 phr,最佳反应温度为170℃,反应时间8 min,转子转速60 r/min,此时接枝率最高达到0.46％;加入第二单体St后,当n(St) /n(MAH)为1/1时,EPM-g-(MAH-co-St)的接枝率为0.64％,接枝率明显提高.     

Synergistic effect of dual rubber system in toughening styrene maleic anhydride copolymers

Styrene maleic anhydride (SMA) copolymers were toughened by blending with two distinctly different rubber modifiers: styrene‐butadiene‐styrene (SBS) block copolymer and methacrylated butadiene‐styrene emulsion‐made graft copolymer (MBS). The modifiers were used both individually and in combination for the examination of their roles in toughening SMA. SMA was miscible with poly(methylmethacrylate) shell of MBS, whereas it was partially miscible with the polystyrene (PS) phase of SBS. When 40–50% of SBS was used in blends, the PS phase of SBS became immiscible with SMA. SBS did not improve the Izod impact strength of SMA appreciably. A prominent synergistic toughening effect was experimentally observed when SBS and MBS were used in combination in brittle SMA. This effect may be attributed to the fact that the large SBS particles initiate crazes and small MBS particles with good adhesion to SMA matrix improve the ligament thickness, which may play a critical role in craze growth and termination. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2260–2267, 2003     

Preparation and characterization of nano‐CaCO3 encapsulated by copolymerization of styrene and maleic anhydride

Encapsulated nanometer calcium carbonate (nano‐CaCO₃) was prepared using styrene and maleic anhydride (MAH) copolymer in 2‐propanol or methanol–water mixture in the presence of different initiator systems. The particle morphology and physical properties of the encapsulated nano‐CaCO₃ particles, such as the interaction between the encapsulating polymer and the nano‐CaCO₃, and the thermal stability of encapsulated nano‐CaCO₃ were studied by Fourier‐transform infrared spectroscopy (FTIR), Soxhlet extraction experiments, thermogravimetric analysis banded with FTIR (TGA‐FTIR) and transmission electron microscopy (TEM). The encapsulating ratio and the stable encapsulating ratio of encapsulated nano‐CaCO₃ were characterized. The results showed that a strong interfacial interaction was obtained due to the formation of a chemical bond or ion‐dipole between the C?O group of MAH and Ca²⁺ ion of nano‐CaCO₃. The encapsulating ratio and stable encapsulating ratio of nano‐CaCO₃ initiated by AIBN was higher than that initiated by BPO. Addition of maleic anhydride increased the encapsulating ratio and the stable encapsulating ratio of encapsulated nano‐CaCO₃. For the encapsulated nano‐CaCO₃ prepared in methanol–water, the diameter of the encapsulated nano‐CaCO₃ particle increased from 60–70 nm to about 100 nm and the morphology changed from a cube with a sharp edge to spherical with a rough surface. Copyright © 2006 Society of Chemical Industry     

二釜串联连续本体法制备SMA

用二釜串联连续本体工艺制备苯乙烯-顺丁烯二酸酐无规共聚物,分别研究并获得了首釜和第二釜的启动操作策略和稳态工艺条件。     

Copolymerization of styrene and maleic anhydride in supercritical carbon dioxide

The copolymerization of styrene (St) and maleic anhydride (MA) was carried out in supercritical carbon dioxide (SC CO₂). It was found that St and MA are easy to copolymerize in SC CO₂ and the conversion can reach 97%, and that very fine and dry powders are obtained. The products were characterized using Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). GPC data showed that the molecular weight of the copolymer reach 3.62 × 10⁴ g mol^?1. Scanning electron microphotographs showed the minimum particle size of the product is about 200 nm. DSC measurements indicated that the glass transition temperature (T_g) of the copolymer increases with increasing the MA content in the copolymer. TGA curve showed that the copolymers were decomposed at about 350°C. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Study on controlled radical alternating copolymerization of styrene with maleic anhydride under UV irradiation

The copolymerization of styrene with maleic anhydride (MAh) in the presence of 1‐(ethoxycarbonyl)prop‐1‐yl dithiobenzoate was carried out under UV irradiation at room temperature, and showed ‘living’ polymerization nature which was evidenced by: linear evolution of molecular weight with conversion; and narrow molecular weight distribution (M_w/M_n = 1.08–1.20). The compositional analysis and the sequence structural information of the copolymer obtained from Distortionless Enhancement by Polarization Transfer (DEPT) NMR experiments demonstrated that the copolymers obtained possess strictly alternating structure. © 2003 Society of Chemical Industry     

苯乙烯对马来酸酐熔融接枝聚丙烯的影响

用双螺杆挤出机分别制备了马来酸酐(MAH)和MAH-苯乙烯(St)共单体接枝共聚聚丙烯(PP)。红外光谱分析表明:MAH单体被接枝到PP大分子链上;引入St后,产物熔体流动速率从16.42 g/10min降为0.60 g/10 min;吸光度比从0.021升高到0.778,但St含量过高时,PP基体发生交联,影响接枝共聚物的加工性能。探讨了共单体St的作用机理以及交联机理。     

反应增容型马来酸酐/丁腈橡胶接枝共聚物的制备

以过氧化苯甲酰(BPO)为引发剂、马来酸酐(MAH)为接枝单体、四氢呋喃为溶剂,采用溶液接枝法制备了MAH/丁腈橡胶(NBR)接枝共聚物(MAH-g-NBR),考察了MAH及BPO的用量、反应温度对接枝率的影响,并通过傅里叶变换红外光谱和热重分析法对接枝产物进行了表征。结果表明,接枝产物有2个明显的热失重阶段,第1阶段发生在152℃左右,为接枝共聚物的脱羧阶段,第2阶段发生在360℃左右,为NBR分子链的断裂,证明了MAH-g-NBR的存在;在NBR用量为1 g、MAH用量为1.3 g、BPO用量为0.08 g、反应温度为65℃的条件下,MAH-g-NBR的接枝率最高可达4.12%。