三元共聚丙烯酸酯压敏胶合成工艺优化

介绍了用过氧化二苯甲酰为引发剂,甲苯为溶剂,丙烯酸丁酯（BA）、甲基丙烯酸甲酯（MMA）及苯乙烯（St)三元共聚合成丙烯酸酯压敏胶粘剂的方法,应用正交试验确定了最优工艺条件;共聚温度80℃、St用量0.20mol、MMA用量0.35mol、BPO用量为2.3g时可获得剥离强度高的压敏胶粘剂;共聚温度75℃、St用量0.10mol、MMA用量0.30mol、BPO用量为3.8g时可获得高固含量的压敏胶粘剂。     

三元共聚丙烯酸酯压敏胶粘剂的合成

以丙烯酸丁酯 (BA)、苯乙烯 (St)、甲基丙烯酸甲酯 (MMA)为原料 ,用过氧化二苯甲酰 (BPO)为引发剂 ,在甲苯溶剂中 ,三元共聚合成了丙烯酸压敏胶粘剂 ;考察了St、MMA用量及共聚温度对压敏胶剥离强度与固体含量的影响 ,发现在c(BPO) =4× 10 -2 mol/L ,共聚温度为 70℃ ,各单体用量为 :n(MMA) =0 .3mol、n(St) =0 .2mol、n(BA) =0 .5mol时 ,合成的压敏胶粘剂具有高剥离强度 ( 13 .9N/ 2 5mm)与高固含量 ( 64% ) ,这些性能指标均优于商品压敏胶。     

保护膜用高剥离力丙烯酸酯乳液压敏胶的研制

以丙烯酸丁酯（BA）、丙烯酸酯（2-EHA）、甲基丙烯酸甲酯（MMA）、苯乙烯（St）、丙烯酸（AA）、丙烯酸羟丙酯（HPA）为原料进行乳液共聚,合成了保护膜用丙烯酸酯乳液压敏胶,讨论了各种单体、乳化剂、交联剂对压敏胶性能的影响。结果表明,该压敏胶具有较高的剥离强度和初黏力,同时具有较好的耐高温高湿老化性能。     

用作无纺布胶粘剂的BA/MMA/NMA三元共聚乳液的性能研究

由于丙烯酸酯类共聚乳液胶粘剂具有耐候性好，强度高，耐洗以及柔软等优点，所以近年来成为人们研究的热点，并且在生产实际中也得到了较广泛的应用。本文以研制服装厂边角料无纺布粘合剂为目的，采用N一羟甲基丙烯酸胶（NMA）为交联剂的BA－MMA－NMA（BA指丙烯酸丁酯，MMA指甲基丙烯酸甲酯）三元共聚体系，研究了交联剂NMA的含量对胶粘剂合成和力学性能的影响，并通过红外光谱和差热分析等手段探讨了共聚物交联的反应机理，还分析了交联剂的加入影响粘接力学性能的原因。本实验合成了NMA用量不同的共聚乳液产物，并测量了产物的…     

结合磷阻燃型苯丙共聚乳液胶粘剂的合成及性能研究

以苯乙烯(St)、丙烯酸丁酯(BA)、丙烯酸乙酯(EA)、甲基丙烯酸甲酯(MMA)、丙烯酸(AA)和含磷单体为共聚单体,采用预乳化种子乳液聚合法制备PSA(结合磷型苯丙共聚乳液胶粘剂),并在PSA中添加少量无机阻燃剂APP(聚磷酸铵)制备CPSA(复合型阻燃胶粘剂)。系统研究了含磷单体和APP含量对乳液稳定性、胶膜剥离强度、涂层阻燃性和热性能等影响。结果表明:当m(St+BA+EA+MMA+AA)=40 g、m(St)∶m(BA)∶m(EA)∶m(MMA)∶m(AA)=16∶90∶60∶24∶5、w(含磷单体)=4%和w(APP)=12%(相对于单体总质量而言)时,可制成稳定性、剥离强度和阻燃性能俱佳的CPSA。     

SIN型聚氨酯无“三苯”鞋用胶粘剂的研制

采用互穿网络理论，用丙烯酸酯（甲基丙烯酸甲酯MMA、丙烯酸丁酯BA、丙烯酸）对聚氨酯进行改性，在无苯溶剂体系下合成高性能环保型鞋用胶粘剂，并讨论溶剂、固化剂对粘接性能的影响，通过批量生产和使用，表明该鞋用胶粘剂初粘力大、粘接强度高、适用性广、综合性能达到国内先进水平。     

丙烯酸酯乳液胶粘剂的合成及其性能研究

以丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)、苯乙烯(St)、丙烯腈(AN)和丙烯酸(AA)为单体,十二烷基硫酸钠(SDS)为乳化剂,过硫酸钾(KPS)为引发剂,通过半连续乳液聚合方法合成了丙烯酸酯乳液胶粘剂。研究了软硬单体配比、不同硬单体以及功能单体AA对胶粘剂性能的影响。研究结果表明,当m(BA)∶m(MMA)∶m(AN+St)=75∶15∶10[其中m(AN)∶m(St)=1∶3]、w(AA)=2份时,制备的乳液胶粘剂具有较好的剪切强度、拉伸强度和耐水性。     

EPDM-g-MMA对MS树脂的增韧作用

用溶液接枝共聚合法合成了三元乙丙橡胶（EPDM）与甲基丙烯酸甲酯（MMA）的接枝共聚物EPDM—g—MMA。红外光谱（FT—IR）分析证实EPDM分子链已接上MMA支链。用EPDM—g—MMA与MMA／笨乙烯（St）共聚物（MS树脂）熔融共混制备耐老化黄变高抗冲塑料（EMS）。研究了EPDM—g—MMA对MS树脂的增韧作用。结果表明：随着EPDM含量的增加，EMS的冲击性能提高，拉伸及弯曲性能下降。在EPDM质量分数为25％时，EMS缺口冲击强度达22．3kJ／m^2，约为MS树脂的15倍。EMS冲击断面形态的扫描电镜（SEM）分析表明，随着EPDM含量增加，其增韧机理由空穴化向轻度剪切屈服转变。     

外国专利摘录

耐热、导热的压敏胶片日东电工等（日本），WO9745499（199124），对页。含4（）ph粉末六方形氮化硼（h－BN）和0．ZPhr三丙烯酸三羟甲基丙烷酯的丙烯酸一丙烯酸了酯一丙烯酸异辛酯共聚浆液，制压敏胶片，用于电子元件固定。双层玻璃密封用反应性热熔胶HenkelTeroson（德国），W097487781997．12．24），26页。反应性热熔胶含甲硅烷基的聚烯烃或氢化聚丁二烯，丁基橡胶，聚a一烯烃，沸石，碳黑，有机硅烷，催化剂等成份。眼外科用氨基丙烯酸酯胶粘剂Universjdad上汕e等洒班牙），WO9749436（199712．31），22页。胶2个组分：氰基丙烯酸…     

第三单体对丙烯酰胺／苯乙烯无皂乳液共聚反应的影响

考察了作为第三单体的甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）、丙烯酸（AA）或二甲基二烯丙基氯化铵（DMDAAc）对丙烯酰胺（AAm）／苯乙烯（St）共聚反应速率和乳液性质的影响。研究结果表明在AAm／St二元共聚体系中添加所选用的第三单体都加快共聚反应速率，第三单体的水溶性越大，其增加反应速率的幅度也越大；随着第三单体水溶性的提高，乳液的稳定性增大；增大BA的质量分数可以使乳液的稳定性和表面电荷密度增大。     

苯乙烯-甲基丙烯酸甲酯悬浮-乳液耦合聚合动力学

采用苯乙烯(St)悬浮聚合过程滴加甲基丙烯酸甲酯(MMA)乳液聚合组分,进行悬浮-乳液耦合聚合(SECP), 制备大粒径聚苯乙烯-聚甲基丙烯酸甲酯(PS-PMMA)复合粒子.采用¹H NMR分析方法,讨论了SECP动力学特征.St的SECP聚合速率和转化率与悬浮聚合一致;MMA聚合速率决定于乳胶粒子聚合速度和凝并在悬浮粒子表面的速度,聚合速率比常规乳液聚合速率低.由于凝并在悬浮粒子表面的PMMA乳胶粒子不再有乳液聚合特征,MMA在SECP中转化率低于同条件常规乳液聚合.分别得到乳化剂和引发剂浓度与SECP和普通乳液聚合恒速段聚合速率的关系.     

Graft polymerization of some vinyl monomers onto acrylic rubber. I. Chain transfer and grafting reaction

The grafting reactions of styrene (St), methyl methacrylate (MMA), and vinyl acetate (VAc) were investigated in the presence of n-butyl acrylate–acrylonitrile copolymer. Results showed that the nature of monomer and initiator were the major factors influencing the grafting activity. The grafting efficiency was 0.87 for St, 0.26 for MMA, and 0.18 for VAc under the most favorable conditions. Acrylic rubber reduced the rate of polymerization, and the retarding effect increased in the order St, MMA, VAc. The chain transfer constants for acrylic rubber were evaluated to be 4.8 × 10^?4 for St, 1.27 × 10^?3 for MMA, and 1.45 × 10^?3 for VAc. The rate of polymerization and the grafting efficiency decreased with increasing acrylonitrile content in acrylic rubber, while the chain transfer constant of St for acrylic rubber remained practically unchanged.     

Control of volume shrinkage and residual styrene of unsaturated polyester resins cured at low temperatures. II. Effect of comonomer

The effect of a comonomer, methyl methacrylate (MMA), on volume shrinkage and residual styrene content of an unsaturated polyester (UP) resin with low profile additives (LPAs) cured at low temperature was investigated by an integrated reaction kinetics-morphology-property analysis. MMA affects the volume shrinkage and residual styrene content differently depending on MMA to styrene (St) CC bond molar ratio. At low MMA/St ratio, residual styrene decreases and the volume shrinkage of the resin system remains unchanged. At high MMA/St ratio, residual styrene can be substantially reduced, but the resin system suffers poor volume shrinkage control. Reactivity of the comonomer MMA and its compatibility to other components in the resin system can explain the observed results. A series of Seemann composites resin infusion molding process (SCRIMP) were conducted to study the relationship among materials, processing, and properties of molded composites in low temperature curing processes.     

聚氯乙烯耐热改性剂的合成及性能

以苯乙烯(St),甲基丙烯酸甲酯(MMA)为耐热改性单体,根据粒子核壳结构设计原理,采用乳液互穿聚合方法在核中加入交联剂二乙烯苯(DVB)合成三元共聚物,壳层是苯乙烯和甲甲酯的二元共聚物,合成出纳米粒子型耐热改性剂,并对交联剂用量和核壳单体比例对粒径大小和玻璃化温度的影响做了研究。     

VTMS/MMA/St三元共聚物的合成与表征

以甲基丙烯酸甲酯（MMA）、苯乙烯（St）、乙烯基三甲氧基硅烷（VTMS）为单体通过乳液聚合制备了含有机硅氧烷的三元共聚物乳液；研究了单体配比与转化率之间的关系．并表征了共聚物的结构，测试了共聚物的热性能。结果表明，共聚物中成功地引入丁有机硅链节．聚合过程中部分硅氧烷部分发生水解，共聚物的热稳定性和玻璃化温度有一定提高。     

低收缩不饱和聚酯及其染色性研究

以甲基丙烯酸甲酯(MMA)和苯乙烯(St)为共聚单体,改变MMA和St的单体配比,用悬浮聚合方法合成了一系列共聚物,并以此作为低收缩添加剂(LPA),溶解于St中,加入到不饱和聚酯(UP)中进行固化反应。在此基础上,改变固化反应温度,LPA用量和种类,研究了LPA/UP体系固化后的体积收缩率、染色性能和力学性能。结果表明:MMA-St共聚物作为LPA,可以有效地降低UP固化后的体积收缩,并且保证了固化产物力学性能不降低和着色的均一性。     

Blends of poly(vinyl chloride) (PVC)/natural rubber‐g‐(styrene‐co‐methyl methacrylate) for improved impact resistance of PVC

To improve the mechanical properties of poly(vinyl chloride) (PVC), the possibility of combining PVC with elastomers was considered. Modification of natural rubber (NR) by graft copolymerization with methyl methacrylate (MMA) and styrene (St) was carried out by emulsion polymerization by using redox initiator to provide an impact modifier for PVC. The impact resistance, dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM) of St and MMA grafted NR [NR‐g‐(St‐co‐MMA)]/PVC (graft copolymer product contents of 5, 10, and 15%) blends were investigated as a function of the amount of graft copolymer product. It was found that the impact strength of blends was increased with an increase of the graft copolymer product content. DMA studies showed that NR‐g‐(St‐co‐MMA) has partial compatibility with PVC. SEM confirmed a shift from brittle failure to ductility with an increase graft copolymer content in the blends. The mechanical properties showed that NR‐g‐(St‐co‐MMA) interacts well with PVC and can also be used as an impact modifier for PVC. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1666–1672, 2004     

Free Radical Copolymerization of Methyl Methacrylate and Styrene with N-(4-Carboxyphenyl)maleimide

The free radical copolymerization of methyl methacrylate (MMA) or styrene (St) with N-(4-carboxyphenyl)maleimide (CPMI) was carried with AIBN as an initiator in THF solvent at 80°C. A series of copolymers of MMA and St with CPMI were prepared using different feed ratios of comonomers. The values of monomer reactivity ratios (r₁, r₂) determined by Fineman-Ross and Kelen-Tudos methods are 0.26 and 2.51 in the CPMI/MMA system and 0.08 and 0.22 in the CPMI/St system. Alfrey–Price Q-e values for CPMI were calculated as Q = 1.05 and e = 0.41 in the CPMI/MMA system and Q = 1.21 and e = 0.91 in the CPMI/St system. The polymer samples have been characterized by solubility tests, intrinsic viscosity measurements, FT-IR and ¹H-NMR spectral analysis, and thermo-gravimetric analysis. It was found that the initial and final decomposition temperatures increased with increasing the amount of CPMI in the copolymer. The integral procedural decomposition temperature and energy of activation of thermal degradation have also been reported.     

Synthesis of diblock and triblock copolymers containing dendrons via ‘living’ controlled radical polymerization

The dendritic Fréchet‐type polyarylether 2‐bromoisobutyrates (Gn‐Br, n = 1–3) as macroinitiators for the ‘living’/controlled radical polymerization of styrene (St) and methyl methacrylate (MMA) were investigated. The atom transfer radical polymerization of St and MMA carried out with CuBr/bpy (2,2′‐bipyridine) catalyst in bulk yielded well‐defined dendritic–linear diblock copolymers (Gn–PSt and Gn–PMMA). The use of G3–PSt for the block copolymerization of MMA and G3–PMMA for the chain extension polymerization of MMA in the presence of CuBr/bpy catalyst is also described. The triblock copolymers obtained were of predetermined molecular weights and relatively low polydispersities, which indicates the living nature of the reaction system. © 2002 Society of Chemical Industry