(甲基)丙烯酸双环戊烯基酯的除臭研究

提出了一种消除ＤＣＰ（ 双环戊二烯） 与ＤＣＰ（Ｍ） Ａ （ 甲基丙烯酸双环戊烯基酯） 恶臭的新方法。     

酯化反应合成丙烯酸双环戊烯基酯

以双环戊二烯、丙烯酸、水为原料,采用两步法合成丙烯酸双环戊二烯基酯。首先以硫酸为催化剂,双环戊二烯经过水合制得羟基双环戊烯,再以羟基双环戊烯和丙烯酸为原料经过酯化反应得到丙烯酸双环戊二烯基酯与传统的以双环戊二烯与丙烯酸为原料直接加成生成丙烯酸双环戊二烯基酯的工艺相比,减轻了后续的处理工作,提高了产品收率。酯化反应的优化条件为：n（丙烯酸）：n（羟基双环戊烯）为1．1、催化剂二丁基氧化锡用量2．5％（质量分数,以羟基双环戊烯质量为基准,下同）、阻聚剂对羟基苯甲醚用量0．1％、带水剂为50％（其中环己烷用量为20．0％、甲苯用量为30％）、反应温度为99℃,反应时间是4h。在此条件下合成的丙烯酸双环戊烯基酯的收率达92％以上,纯度达94．4％。     

丙烯酸双环戊烯基酯合成工艺的研究

以丙烯酸和双环戊二烯为原料合成了丙烯酸双环戊烯基酯。实验结果表明:以三氟甲磺酸为催化剂,反应温度为90℃,丙烯酸与DCPD摩尔比为1.1∶1,催化剂用量为反应液总质量的0.1%,反应时间为4h、搅拌速率为200r/min的条件下,DCPD转化率在98%以上,DCPA选择性在95%以上。     

丙烯酸双环戊烯基酯（DCPA）自由基聚合的特点与应用

本文就DCPA的自由基聚合，分别论述了普通自由基聚合，氧化自由基聚合、紫外光固化、后交联与接枝共聚合的特点与机制，以及它们在生产上的应用。     

丙烯酸双环戊烯基酯的光引发与聚合机理的研究

通过在有空气和无空气条件下，测定由丙烯酸双环戊烯基酯（CH2=CHCO2-，DCPA）与不同类型光引发剂构成涂膜的光固化时间和分析DCPA及光聚合的不同DCPA聚合物（PDCPA）的红外光谱，提出了DCPA与光引发剂二苯酮（BP）光聚合的一种新反应机理。该机理包括由BP、DCPA的烯丙基氢和氧参予的引发过程，由丙烯酸酯和环戊烯双键参予的链增长过程，以及由高分子自由基和含丙烯酸酯与环戊烯双键的低分子量自由基参予的链终止过程。     

紫外光固化丙烯酸双与三环戊烯基酯涂层与其热性能研究

经过对丙烯酸双环戊烯基酯（ＤＣＰＡ）与新单体丙烯酸三环戊烯基酯（ＴＣＰＡ）涂层的紫外光固化、固化涂层的ＤＳＣ分析及从其红外光谱计算得到的聚合物上残余双键的研究,并与丙烯酸异冰片酯（ＩＢＡ）进行了比较,发现许多新鲜与重要的现象。酯基上含环戊烯双键的ＤＣＰＡ与ＴＣＰＡ,在空气中紫外光固化的速率,大大快于具有饱和酯基的ＩＢＡ,显示酯基上环戊烯的烯丙位氢具有给氢与除去阻聚的氧的作用。ＴＣＰＡ在空气中紫外光固化速率大大快于ＤＣＰＡ,并且是无臭的。２光固化的ＰＤＣＰＡ与ＰＴＣＰＡ中存在残余的丙烯酸酯与环戊烯双键,但是光固化的ＰＩＢＡ中没有。双键的残余率,受所用光引发剂的类型与比率及光聚合的氛围影响。光固化的ＰＤＣＰＡ与ＰＴＣＰＡ可以是交联的。３光固化的ＰＤＣＰＡ与ＰＴＣＰＡ的ＤＳＣ图有三个放热峰与一个吸热谷,但光固化的ＰＩＢＡ的ＤＳＣ图没有放热峰。第一放热峰为所有残余丙烯酸酯双键与部分环戊烯双键聚合热所致。第二放热峰为环戊烯双键聚合热所致。第三放热峰为分解产物燃烧热所致。吸热谷是由于ＰＤＣＰＡ与ＰＴＣＰＡ分解吸热所致。因此在第一与第二放热峰温度范围内ＰＤＣＰＡ与ＰＴＣＰＡ进行了再次交联。４光固化的ＰＤＣＰＡ的第?     

杂多酸催化合成(甲基)丙烯酸异冰片酯的研究

采用杂多酸作为催化剂合成了特殊单体丙烯酸异冰片酯和甲基丙烯酸异冰片酯,并对反应条件进行了优化,使反应收率达到86．1％,纯度≥99％。同时在200L的反应釜中进行了放大试验,放大试验的收率达到86．3％,略优于小试水平,此外对产品的应用性能进行了检测,达到国外同类产品的标准,具有很好的应用前景。     

(甲基)丙烯酸金刚烷甲醇酯的合成

采用1-金刚烷甲醇和1,3-金刚烷二甲醇分别与甲基丙烯酸、丙烯酸在60—70王精沛,加浓硫酸催化酯化,反应2～3h得到相应的酯,收率为88％-96％。     

(甲基)丙烯酸全氟烷基乙酯及其关键中间体的合成

(甲基)丙烯酸全氟烷基乙酯是制备含氟憎水憎油织物整理剂的最重要也是最关键的中间单体.综述了调聚法合成关键中间体全氟烷基乙基碘化物,电解氟化法、四氟乙烯与甲醇调聚法、酯化-水解法或酯化-催化氢化法合成全氟烷基醇,以及(甲基)丙烯酸全氟烷基乙酯的合成方法,以期为(甲基)丙烯酸全氟烷基乙酯制备的工业化提供必要的技术支撑.     

SiW_(12)/SBA-15介孔分子筛催化合成月桂酸乙酯

用传统的水热合成法制备纯硅介孔分子筛SBA-15,将SiW12负载在SBA-15上.采用X射线衍射(XRD)、红外光谱(IR)对不同负载量的催化剂进行了表征.表征结果表明,催化剂SiW12/SBA-15仍具有纯硅SBA-15的介孔结构,SiW12的Keggin结构保持完整.该催化剂用于月桂酸与乙醇的酯化反应,重点考察了硅钨酸的负载量、反应温度、酸醇比、催化剂用量等因素对酯化反应性能的影响.得到最佳反应条件为:硅钨酸的负载量为25%,反应温度90 ℃,酸醇比1:2.5,催化剂用量为月桂酸质量的1%,反应时间4 h.催化剂再生实验结果认为,SiW12/SBA-15介孔分子筛具有良好的再生性能和稳定性.     

Fluorinated poly(meth)acrylate: Synthesis and properties

Due to good reactivity of fluorinated (meth)acrylates with other monomers or polymer segments, fluorinated poly(meth)acrylates possess more economical and convenient synthesis routes than other fluoropolymers. This feature article initially summarizes different types of fluorinated (meth)acrylates, which can be divided into fluorinated alkyl (meth)acrylates and fluorinated aryl (meth)acrylates. Subsequently, various approaches for synthesizing fluorinated poly(meth)acrylates including random, block, graft or star copolymers are described. Conventional free radical polymerization can be used in synthesizing random copolymers, while controlled/“living” radical polymerization can provide well-defined copolymers with accurate control over molecular weight and special structures as expected. In particular, introduction of fluorinated components into as-prepared copolymers offers an alternative route to synthesize fluorinated poly(meth)acrylates which are difficult to be obtained directly via polymerization. The incorporation of fluorine can confer unique and highly desirable properties to poly(meth)acrylates such as low surface energy, thermal stability, chemical and weather resistance, low refractive index, and self-organization characteristics. Such properties are described in great details based on many recent articles.     

Crosslinking of carboxyl functional (meth)acrylate copolymers with bisketeneimine

Summary The bisketeneimine Ph₂C=C=N-C₆H₄-N=C=CPh₂ 1 has been used as a crosslinker for carboxyl functional (meth)acrylate copolymers of various molar masses, in which the COOH group is attached to the backbone through spacers of various length. The crosslinking reaction, carried out at various temperatures, was monitored by infrared spectroscopy and by dynamic mechanical analysis. From a modelreaction with nonanoic acid kinetic parameters were calculated. The products poly(meth)acrylate-polyimide networks were characterised by NMR and FTIR spectroscopy. The thermal stability (TGA measurement) was comparable to that of a corresponding polyurethane.     

(甲基)丙烯酸羟烷基酯合成技术研究进展

介绍了(甲基)丙烯酸羟烷基酯的几种合成工艺路线,并对各种工艺路线的优缺点进行了评述,提出了今后的发展方向。对直接开环法所使用的各类催化剂及其优缺点进行了详细的叙述,同时对阻聚剂方面进行了简要的概括。     

Hydrolyzable Emulsifier-Containing Poly(meth)acrylate Latices for Paper Coating

Coatings of polystyrene and poly(meth)acrylate latices containing alkali-hydrolyzable or nonhydrolyzable cationic emulsifiers on filter papers pretreated with inorganic salts were investigated at room temperature. The surfaces of fibers in the Na₂CO₃-pretreated papers were coated almost uniformly with the latices containing hydrolyzable emulsifiers. The tendency was more remarkable for polymers with a lower glass transition temperature. Furthermore, thermal annealing at low temperature could improve the surface roughness. These results indicate that hydrolysis of the emulsifier facilitates the coalescence of latex particles and the subsequent polymer adhesion to the paper surfaces, leading to the surface modification.     

氯化聚乙烯接枝(甲基)丙烯酸丁酯共聚物的合成与表征

介绍了一种采用原子转移自由基聚合法在无水无氧状态下制备氯化聚乙烯接枝(甲基)丙烯酸丁酯共聚物的合成工艺,并且利用核磁对产物进行了表征.根据谱图积分面积计算了接枝共聚物中(甲基)丙烯酸丁酯和氯的质量含量.比较了氯化聚乙烯接枝共聚物和氯化聚乙烯对聚氯乙烯冲击性能的增强效果.     

On the toughness of photopolymerizable (meth)acrylate networks for biomedical applications

Photopolymerizable networks are being explored for a variety of biomedical applications because they can be formed in situ, rendering them useful in minimally invasive procedures. The purpose of this study was to establish fundamental relationships between toughness, network chemical structure, and testing temperature of photopolymerizable (meth)acrylate networks deformed in air and under hydrated conditions. Networks were formed by combining at least one monofunctional (meth)acrylate with a difunctional methacrylate, and weight ratios were adjusted to vary the degree of crosslinking, elastic modulus, and glass transition temperature (T_g). Stress–strain behavior and toughness were determined by performing tensile strain to failure tests at temperatures spanning the glassy and rubbery regimes of each network both in air and phosphate‐buffered saline. In air, all of the networks demonstrated a peak in toughness below the network's T_g. At an “equivalent” test temperature relative to T_g, crosslinking concentration and monomer chemistry influenced the toughness of each network. Apparent toughness is significantly altered in an aqueous environment, an effect driven by water absorption into the network causing the T_g to decrease. The results from this study provide the fundamental knowledge required to guide the development of tougher photopolymerizable networks for mechanically strenuous biomedical applications. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Thermal polymerization of methyl (meth)acrylate via reversible addition-fragmentation chain transfer (RAFT) process

Thermal polymerization of methyl (meth)acrylate (MMA) was carried out using 2-cyanoprop-2-yl-1-dithionaphthalate (CPDN) and cumyl dithionaphthalenoate (CDN) as chain transfer agents. The kinetic study showed the existence of induction period and rate retardation, especially in the CDN mediated systems. The molecular weights of the polymers increased linearly with the monomer conversion, and the molecular weight distributions (M_w/M_ns) of the polymers were relatively narrow up to high conversions. The maximum number-average molecular weights (M_ns) reached to 351?900 g/mol (M_w/M_n = 1.47) and 442?400 g/mol (M_w/M_n = 1.29) in the systems mediated by CPDN and CDN, respectively. Chain-extension reactions were also successfully carried out to obtain higher molecular weight PMMA and PMMA-block-polystyrene (PMMA-b-PSt) copolymer with controlled structure and narrow M_w/M_n. Thermal polymerization of methyl acrylate (MA) in the presence of CPDN, or benzyl (2-phenyl)-1-imidazolecarbodithioate (BPIC) also demonstrated “living”/controlled features with the experimented maximum molecular weight 312?500 g/mol (M_w/M_n = 1.57). The possible initiation mechanism of the thermal polymerization was discussed.     

Kinetics for free radical solution polymerization of heptadecafluorodecyl (meth)acrylate in supercritical carbon dioxide

Free radical solution polymerization of heptadecafluorodecyl acrylate (HDFDA) and heptadecafluorodecyl methacrylate (HDFDMA) was carried out by using 2,2′-azobisisobutyronitrile (AIBN) as the initiator in supercritical carbon dioxide (scCO₂). We performed solution polymerization with changing initiator concentration, temperature and polymerization time to study the polymerization kinetics. A nonlinear least square method and dead-end theory were used to determine the constant, K (K=(k _p √f)/√k _d k _d ) and initiator decomposition rate constant (k _d ) from experimental data. k _d was measured as 3.77 × 10⁻⁵ s⁻¹ at 62.7°C for poly(HDFDA) and 2.71 × 10⁻⁵ s⁻¹ at 62.5 °C for poly(HDFDMA), respectively, by nonlinear least square method.     

Copolymerization of amine-containing monomers and dodecyl (meth)acrylate in toluene: controlling compositional heterogeneity

This study focuses on a facile approach to create polyelectrolyte/SiO₂ composite thin films. The film was fabricated by alternate deposition of N-[3-(trimethoxysilyl)propyl]diethylenetriamine (C₁₀H₂₇N₃O₃Si, TPDT in short) and poly(acrylic acid) (PAA). The layer-by-layer assembly process was accompanied by sol–gel transition of TPDT. The resultant films were investigated in detail by Fourier transform infrared spectroscopy (FT-IR), UV-Visible spectroscopy (UV–vis), ellipsometry, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicated that the films grew exponentially with increasing bilayer number. During deposition, hydrolysis and condensation of silanol groups in the film resulted in the formation of a Si-O-Si network embedded into the framework of the polymer. The obtained free-standing films had high transparency even with a high content of silica, and showed good mechanical properties with a tensile strength of 32.8 MPa at break.     

Effect of structure and composition on physico-mechanical properties of methyl methacrylate/alkyl (meth)acrylate copolymers

The paper describes the fabrication of cast acrylic sheets by copolymerizing a prepolymer syrup of methyl methacrylate (MMA) with varying amounts (1-20 wt.-%) of 2-ethylhexyl methacrylate (EHMA), n-hexyl methacrylate (HMA), 2-ethylhexyl acrylate (EHA) and n-hexyl acrylate (HA). The effect of structure of copolymer on light transmittance, density and mechanical properties was evaluated. Tensile strength and storage modulus decreased with increasing comonomer content. Strain increased significantly in the case of MMA/EHA and MMA/HA copolymer sheets having 15 and 20 wt.-% of comonomer. Softening temperature of copolymer samples was determined using dynamic mechanical thermal analysis. Heat deflection temperature under flexural load and softening temperature decreased with increasing comonomer content in copolymer.