甲基丙烯酸甲酯、苯乙烯与顺丁烯二酸二丁基锡三元共聚物的合成与表征

以过氧化苯甲酰(BPO)为引发剂,将顺丁烯二酸二丁基锡(DBTM)与苯乙烯(St)、甲基丙烯酸甲酯(MMA)进行本体三元共聚反应,探讨了共聚反应条件.用液相色谱、红外光谱、核磁共振氢谱和热重分析对共聚物的结构和性能进行了表征.动态热流变性实验结果表明,在含锡量相同的情况下,共聚物对PVC的热稳定效果优于DBTM,可以作为多功能化的PVC热稳定剂.     

富勒烯-苯乙烯-甲基丙烯酸三元共聚物的合成及其摩擦学性能

纳米微球;富勒烯-苯乙烯-甲基丙烯酸三元共聚物的合成及其摩擦学性能     

丙烯腈-苯乙烯共聚物对聚甲醛的热稳定化作用

研究了丙烯腈-苯乙烯(AS)共聚物对聚甲醛(POM)的热稳定化作用. 结果表明, 在动态混炼条件下, 添加少量的AS共聚物可使POM的熔体稳定性和熔融滞留时间明显增大, AS最优添加质量分数为3%; 在静态加热条件下, AS的加入可使POM在升温过程中的分解温度显著提高, 在恒温过程中的失重率明显降低. 在动态或静态条件下, AS共聚物对POM热稳定性的贡献效果一致, 并且同时加入AS和三聚氰胺对POM的热稳定性改善更为显著. 红外分析结果表明, AS对POM的热稳定化作用源于分子链上的氰基对甲醛的有效吸收.     

顺丁烯二酸二丁基锡-苯乙烯-丙烯酸丁酯三元共聚物的结构与性能表征

采用本体聚合的方法，在氧化苯甲酰（BPO）存在下，合成了顺丁烯二酸二丁基锡－苯乙烯－丙烯酸丁酯（DBTM－St-BA)三元共聚物，用GPC，FTIR，1H NMR，TG和刚果红法及布拉本热流变仪对共聚产物的结构和性能进行了有征，结果表明，在所选定的聚合条件下，共聚产物为DBTM－St-BA的三元共聚物，在含锡量相同的情况下，共聚物对PVC的热稳定效果和加工性能的影响优于DBTM，可以作为多功能化的PVC热稳定剂。     

含氟三元丙烯酸酯乳液共聚物的合成及性能

含氟三元丙烯酸酯乳液共聚物的合成及性能;甲基丙烯酸甲酯;丙烯酸丁酯;含氟甲基丙烯酸酯;β-环糊精     

偏氯乙烯-丙烯腈-苯乙烯共聚物颗粒发泡行为研究

用显微镜实时监测实验方法研究了偏氯乙烯 (VDC) 丙烯腈 (AN) 苯乙烯 (St)共聚物颗粒的发泡行为 ,考察的影响因素包括共聚物组成、发泡剂浓度、颗粒粒径、发泡温度等 .实验发现 ,共聚物中AN或St单元含量提高 ,发泡速率降低 .提高发泡温度或增加发泡剂浓度 ,均加快发泡速率 .由于在聚合物颗粒发泡时存在发泡剂损失 ,小粒径的VDC AN St共聚物颗粒发泡速率快 .当颗粒发泡生长较快时 ,发现有生长过头现象 ,这可能是由惯性生长造成的     

丙烯酸酯的合成及表征

设计并合成了三种以二苯甲酮为母体取代的单、双官能团丙烯酸酯或甲基丙烯酸酯，其结构经元素分析、IR和^1H NMR表征。     

聚甲基丙烯酸甲酯/(苯乙烯-丙烯腈)共聚物混合体系的早期分离

本文用激光光散射技术研究了高分子混合体系聚甲基丙烯酸甲酯/(苯乙烯-丙烯腈)共聚物(PMMA/PSAN)不稳相分离(Spinodal decomposition)过程,结果指出,相分离前期符合Cahn理论预言的结果;首次用光散射技术在高分子混合体系相分离研究中得到了不稳相分离增长速率最大值R(q_m);只(q)的实验结果与理论值相吻合;证实了界面自由能对相分离增长速率的影响是不可忽略的。     

富勒烯-苯乙烯-顺丁烯二酸酐三元共聚物的摩擦学行为

水溶性;纳米微球;摩擦学性能;富勒烯-苯乙烯-顺丁烯二酸酐三元共聚物的摩擦学行为     

丙烯酸酯三元共聚物负载硫铂络合物的合成及催化性能

丁二醇二丙烯酸酯、丙烯酸甲酯、丙烯酸β-氯乙酯或丙烯酸ω-氯己酯进行三元共聚,合成了两类4种带ω-氯侧基的交联型聚丙烯酸酯.它们以乙硫醇硫醚化,再与氯亚铂酸钾反应,得到4种交联型聚丙烯酸酯负载的硫铂络合物.这些络合物对癸烯-1、十二烯-1、苯基烯丙醚、苯乙烯与三乙氧基硅烷的硅氢加成反应具有良好的催化活性.讨论了温度、催化剂用量对催化性能的影响及催化剂的重复使用情况.     

Synthesis and characterization of amphiphilic cationic symmetrical ABCBA pentablock terpolymer networks: Effect of hydrophobic content

Group transfer polymerization was employed for the preparation of six amphiphilic terpolymer networks comprising the hydrophilic, pH‐responsive 2‐(dimethylamino)ethyl methacrylate (DMAEMA), the neutral hydrophilic methoxy hexa(ethylene glycol) methacrylate (HEGMA), and the hydrophobic n‐butyl methacrylate (BuMA). 1,4‐Bis(methoxytrimethylsiloxymethylene)cyclohexane was used as a bifunctional initiator, whereas ethylene glycol dimethacrylate served as the crosslinker to interconnect the linear terpolymer precursors to three‐dimensional terpolymer network structures. Five of the terpolymer networks were model, with linear chains between crosslinks of precise length. Four of the five model networks were based on ABCBA pentablock terpolymers with theoretical structure DMAEMA₅‐b‐BuMA_n/2‐b‐HEGMA₁₀‐b‐BuMA_n/2‐b‐DMAEMA₅ with n values equal to 5, 10, 20, and 30. The model network based on the equimolar statistical terpolymer and the nonmodel randomly crosslinked terpolymer network were also prepared. The molecular weights and compositions of the linear pentablock terpolymer precursors to the networks were found to be close to the theoretically expected, while the network sol fractions were found to be relatively low. The degrees of swelling of the networks in water were found to decrease with increasing the hydrophobic content, whereas those in THF exhibited the opposite trend. Small‐angle neutron scattering in deuterium oxide indicated structural organization in the most hydrophobic pentablock terpolymer networks. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4420–4432, 2008     

Synthesis of a polyolefin–polystyrene graft terpolymer

A graft polymer was prepared attaching the macromer, polystyrene end-capped with benzocyclobutene, to the carbon–carbon double bonds in poly-1-hexene-co-7-methyl-1,6-octadiene through thermally induced Diels–Alder reactions. The branches per backbone were determined by additive molecular weights and NMR spectroscopy to be 0.8, 1.6, and 2.7, for levels of polystyrene of 40, 60, and 80%, respectively. Grafting efficiencies were high, varying from 84–95%. © 1993 John Wiley & Sons, Inc.     

Synthesis, characterization and thermal degradation of 8-hydroxyquinoline-guanidine-formaldehyde terpolymer

Terpolymer (8-HQGF) has been synthesized using the monomers 8-hydroxyquinoline, guanidine, formaldehyde in 1:1:2 molar proportions. The structure of 8-HQGF terpolymer has been elucidated on the basis of elemental analysis and various physicochemical techniques, i.e. UV-Visible, FTIR-ATR and ¹H NMR spectroscopy. Detailed thermal degradation study of the new terpolymer has been carried out to ascertain its thermal stability. Thermal degradation curve is discussed which shows two decomposition steps (265-475 °C and 540-715 °C). Sharp-Wentworth and Freeman-Carroll methods have been used to calculate activation energies and thermal stability. The activation energy (E_a) calculated by using the Sharp-Wentworth (21.98 kJ/mol) has been found to be in good agreement with that calculated by Freeman-Carroll (23.57 kJ/mol) method. Thermodynamic parameters such as free energy change (ΔF), entropy change (ΔS), apparent entropy change (S^∗) and frequency factor (Z) have also been evaluated on the basis of the data of Freeman-Carroll method. The order of reaction (n) is found out to be 0.9979.     

Synthesis and characterization of new cross-linked terpolymer systems containing silyl group

A series of acrylic terpolymers containing silyl pendant groups was prepared by free radical cross-linking copolymerization. Me₃Si, Et₃Si and t-BuMe₂Si together with cubane-1, 4-dicarboxylic acid (CDA) were covalently linked with 2-hydroxyethyl methacrylate (HEMA). The silyl-linked HEMA are abbreviated as TMSiEMA, TESiEMA and TBSiEMA respectively. Cubane-1, 4-dicarboxylic acid (CDA) linked to two HEMA group is the cross-linking agent (CA). Free radical cross-linking terpolymerization of the methyl methacrylate (MMA) and methacrylic acid (MAA) with two different molar ratios of organosilyl monomers and CA was carried out at 60–70 ^∘C. The compositions of the cross-linked three-dimensional polymers were determined by FT-IR spectroscopy. The glass transition temperature (Tg) of the network polymers was determined calorimetrically. The Tg of network terpolymers increases with increasing of cross-linking degree. Equilibrium swelling studies were carried out in enzyme-free simulated gastric and intestinal fluids (SGF and SIF, respectively). The gels swelled more in SIF than in SGF. The swelling behaviour of the copolymers was dependent on the content of MAA groups and caused a decrease in gel swelling in pH 1 or an increase in gel swelling in pH 7.4. Based on the great difference in swelling ratio at pH 1 and 7.4 for P-1, P-6 and P-10 appear to be good candidates for colon-specific drug delivery.     

A refinement of the terpolymer equation and its simple extension to two- and four-component systems

Terpolymer composition estimation with an established equation has been found to give results that vary with the feed monomer ratio substitution pattern used. A new copolymer equation has been derived that overcomes this difficulty to give the same composition results regardless of the order of monomer substitution. The new equation also gives comparable or better agreement with experimentally determined copolymer compositions than obtained by use of the established Alfrey-Goldfinger terpolymer equation. In addition, this new terpolymer equation demonstrates a versatility not shown by the present terpolymer equations in that it can be readily adapted by inspection to enable estimation of copolymer compositions for two- or for four-component polymer systems. It is also readily adaptable for copolymers with more than four components, and may also be valid for composition estimation of these because of the derivation method used, although it has not as yet been possible to test this possibility. © 1996 John Wiley & Sons, Inc.     

Synthesis and characterization of polymethylphenylsilane–polystyrene block copolymers

Block copolymers of polymethylphenylsilane (PMPS) and polystyrene (PS) have been successfully prepared by the condensation of α,ω-dichloro-polymethylphenylsilane with polystyryl-lithium. These new materials have been characterized by UV spectroscopy, ²⁹Si-NMR, and size exclusion chromatography. These block copolymers show a good emulsifying activity to compatibilize blends of the two homopolymers (PMPS and PS). © 1993 John Wiley & Sons, Inc.     

Synthesis and characterization of diaminomaleonitrile-functionalized polystyrene grafts for application in pervaporation separation

Synthesis, characterization and application of diaminomaleonitrile (DAMN)-functionalized polystyrene grafts were studied. Dibenzoyle peroxide (BP) was used as an initiator. Optimum conditions for grafting were found to be c(DAMN) = 0.5 M, c(BP) = 0.016 M, θ = 85 °C and t = 4 h. Water uptake of the polystyrene graft membranes was found to increase with the increase of the grafting yield. The chemical structure, thermal characteristics and thermal stability of the obtained membranes were investigated by means of FTIR spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis. Polystyrene graft membrane with the degree of grafting of up to 96 % was found to be useful for the pervaporation separation of phenol/water mixtures.     

Synthesis and characterization of linear tetrablock quarterpolymers of styrene,isoprene, dimethylsiloxane,and 2-vinylpyridine

A series of five tetrablock quarterpolymers of styrene, isoprene, dimethylsiloxane, and 2-vinylpyridine with molecular weights varying from 117 × 10³ to 177 × 10³ and having different compositions were synthesized. The synthesis was based on recent advances in the controlled high-vacuum anionic polymerization of hexamethylcyclotrisiloxane and on the selective linking of poly(dimethylsiloxane)lithium with the chlorosilane group of the heterofunctional linking agent chloromethylphenylethylene dimethylchlorosilane. Combined characterization results by size exclusion chromatography, membrane osmometry, and NMR spectroscopy suggested that the synthesized multiblock multicomponent polymers had a high degree of structural and compositional homogeneity. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 514–519, 2004     

Synthesis and characterization of epoxy-functional polystyrene particles

Colloidal polystyrene particles with surface epoxy groups have been synthesized through surfactant-free emulsion copolymerization of styrene with glycidyl methacrylate; and through copolymerization of glycidyl methacrylate (GMA) and methyl methacrylate as shells around existing polystyrene seed particles. We developed two titration methods to quantify the number of epoxy groups that survived the polymerization processes. The styrene-GMA copolymer particles were judged to be unsatisfactory as model colloidal materials due to their size polydispersity and unknown internal distribution of epoxy groups. The core-shell particles had high epoxy surface densities with at least 60% of the initial epoxy groups surviving the synthesis process. Transmission electron microscopy shows that the thickness of the epoxy-rich shell is less than expected based on the volume of monomers added, suggesting that some of the monomer forms water-soluble oligomers. Photon correlation spectroscopy measurements imply that the shell is swollen with water and consists of polymer configurations which extend out into solution. The morphological details vary consistently with the GMA content, and hence the hydrophilicity, of the shell polymer. © 1995 John Wiley & Sons, Inc.     

Dendrons and Dendritic Terpolymers: Synthesis,Characterization and Self-Assembly Comparison

To the best of our knowledge, this is the very first time that a thorough study of the synthetic procedures, molecular and thermal characterization, followed by structure/properties relationship for symmetric and non-symmetric second generation (2-G) dendritic terpolymers is reported. Actually, the synthesis of the non-symmetric materials is reported for the first time in the literature. Anionic polymerization enables the synthesis of well-defined polymers that, despite the architecture complexity, absolute control over the average molecular weight, as well as block composition, is achieved. The dendritic type macromolecular architecture affects the microphase separation, because different morphologies are obtained, which do not exhibit long range order, and various defects or dislocations are evident attributed to the increased number of junction points of the final material despite the satisfactory thermal annealing at temperatures above the highest glass transition temperature of all blocks. For comparison reasons, the initial dendrons (miktoarm star terpolymer precursors) which are connected to each other in order to synthesize the final dendritic terpolymers are characterized in solution and in bulk and their self-assembly is also studied. A major conclusion is that specific structures are adopted which depend on the type of the core connection between the ligand and the active sites of the dendrons.