甲基丙烯酸缩水甘油酯大孔共聚物的合成、结构及性能研究

以甲基丙烯酸缩水甘油酯为单体,二乙烯苯/三烯丙基异氰脲酸酯作为混合交联剂,甲苯和正庚烷为混合致孔剂,通过悬浮聚合,合成了一系列GMA-DVB-TAIC大孔共聚物,考察了不同反应阶段共聚物的孔结构,通过调节交联剂的用量、致孔剂的用量和比例,可以得到具有较大孔容和孔径、较高热稳定性和性能优良的GTD大孔共聚物.     

大孔标准苯乙烯—二乙烯苯共聚物的合成及其结构的研究

本文利用前文分离提纯的对位及间位二乙烯苯作为交联剂,合成了大孔标准苯乙烯—二乙烯苯共聚物,系统地研究了共聚物的交联度,致孔剂的种类和用量以及良溶剂—非良溶剂致孔剂配比的变化对共聚物孔结构的影响。实验结果表明:不同结构的二乙烯苯作交联剂所合成的共聚物,他们的孔结构参数都随共聚物的合成条件的变化呈现规律性的变化,但它们彼此间在结构性能上存在着明显的差异。     

大孔苯乙烯—二乙烯苯共聚物孔结构稳定性的研究

通过溶剂处理和加热处理,研究了致孔剂种类、配比、用量及单体DVB中异构体组成对苯乙烯—二乙烯苯共聚物孔结构稳定性的影响,及其这种影响与共聚物交联度的关系。     

高交联苯乙烯—二乙烯苯共聚物的孔结构研究

我们以甲苯或甲苯-正庚烷为致孔剂合成了一系列高交联的大孔苯乙烯-二乙烯苯(St-DVB)共聚物,本文报道这些共聚物的孔结构、孔结构稳定性及其与合成条件的关系。     

苯乙烯—二乙烯苯大孔共聚物的合成及其孔结构性能的研究.Ⅲ

作者分别以纯的对—二乙烯苯和纯的间—二乙烯苯以及工业二乙烯苯为交联剂,以甲苯和液腊为混合致孔剂,制得了一系列苯乙烯—二乙烯苯共聚物。测定了共聚物的孔结构参数,讨论了诸反应条件共聚物孔结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸羟乙酯的合成及其结构性能的 …

选用反应性单体甲基丙烯酸羟乙酯（ＨＥＭＡ）,以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和环己烷存在下,用经典悬浮聚合的方法制得了一系列的大孔共聚物。通过测定树脂的孔结构性能及化学组成,讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸缩水甘油酯的合成及其结构性 …

选用反应性单体甲基丙烯酸缩水甘油脂（ＧＭＡ）,以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和正庚烷存在下,用悬浮聚合的方法制得了一系列大孔ＧＤ共聚物。通过测定树脂的孔结构性能及化学组成,讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸羟乙酯的合成及其结构性能的研究

选用反应性单体甲基丙烯酸羟乙酯（ＨＥＭＡ），以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和环己烷存在下，用经典悬浮聚合的方法制得了一系列的大孔共聚物。通过测定树脂的孔结构性能及化学组成，讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸缩水甘油酯的合成及其结构性能的研究

选用反应性单体甲基丙烯酸缩水甘油酯（ＧＭＡ），以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和正庚烷存在下，用悬浮聚合的方法制得了一系列大孔ＧＤ共聚物。通过测定树脂的孔结构性能及化学组成，讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸缩水甘油酯的合成及其结构性能的研究

选用反应性单体甲基丙烯酸缩水甘油酯（ＧＭＡ），以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和正庚烷存在下，用悬浮聚合的方法制得了一系列大孔ＧＤ共聚物。通过测定树脂的孔结构性能及化学组成，讨论了不同交联剂用量和配比对共聚物结构的影响。     

高交联大孔苯乙烯/二乙烯苯共聚物的合成及其孔结构的研究Ⅱ

本文对高交联大孔苯乙烯/二乙烯苯共聚物在干态、湿态与溶胀态的孔结构进行了研究。结果表明,在不同的状态中,高交联共聚物的孔结构是不相同的,它们的孔结构会发生变化。但是,它们的孔结构变化远小于低交联共聚物,也就是说,高交联大孔共聚物的孔结构比低交联共聚物的孔结构稳定。 鉴于高交联大孔共聚物的孔结构较稳定,作者把它用作高效液相色谱的进行了初步实验。结果表明,高交联共聚物可做为高效液相色谱的载体固定相。     

溴化交联聚丙烯腈的合成及其结构性能的研究

以丙烯腈为反应性单体,二乙烯苯为交联剂,甲苯为致孔剂,用悬浮聚合方法制得了一系列不同交联度和不同致孔剂含量的丙烯腈交联聚合物。然后与溴化氢反应进行化学修饰,得到溴化聚丙烯清,讨论了不同交联度和不同致孔剂用量对溴化程度的影响。     

Preparation and characterization of pentaerythritol/butane tetracarboxylic acid/polyethylene glycol crosslinking copolymers as solid-solid phase change materials

Pentaerythritol/butane tetracarboxylic acid/polyethylene glycol (PBPEG) crosslinking copolymers as a novel solid-solid phase change material (SSPCM) were successfully synthesized through the reaction mechanism and conditions of hydroxyl-carboxyl condensation reaction. The composition and chemical structure, crystalline properties, phase change behaviors, thermal reliability and chemical stability of PBPEG crosslinking copolymers were investigated by Fourier transform infrared spectroscopy (FT-IR), wide-angle X-ray diffraction (WAXD), polarization optical microscopy (POM), differential scanning calorimetry (DSC), and thermogravimetry (TGA), respectively. The results show that PBPEG crosslinking copolymers have typical solid-solid phase transition temperatures in the range of 10.31～53.27°C and high latent heat enthalpy in the range of 89.6～102.8 J/g, the synthesized SSPCMs have good thermal reliability and chemical stability after 300 thermal cycles, and PBPEG crosslinking copolymers have good thermal stability before 364°C. In summary, the synthesized PBPEG crosslinking copolymers could be potentially used for thermal energy storage.     

丙烯酸酯系水乳漆的螯合固化

本文研究了含螯合单体2-AAEMA的丙烯酸酯共聚物乳漆的窒温螯合交联,用~1H-NMR测定了共聚物中2-AAEMA的含量,IR研究了螯合交联物的结构;比较了五种金属盐(M~(2 ))和不同2-AAEMA含量的共聚物乳液的实际交联效果,并测定了固化产物的交联程度、漆膜耐水性、硬度和力学性能。     

Photocrosslinking of copolymers of vinyloxyethyl methacrylate-styrene initiated by sulfonium salts. II. Photocrosslinking behaviors

Vinylether was used as a cationically polymerizable moiety and incorporated into sidechain of polymers as copolymers of vinyloxyethyl methacrylate (VEM) and styrene (St). Photoirradiation of the copolymers containing a small amount of benzyl(4-hydroxyphenyl) methylsulfonium salt (BSS) resulted in a high crosslinking density as evidenced by a low degree of swelling, which is ascribed to the high reactivity of the vinyloxy moieties. The sensitivity of this photoreaction is significantly high because of a large kinetic chain length of the cationic polymerization of vinylethers, while copolymers of glycidyl methacrylate and St showed crosslinking to much less extent when irradiated under the same condition. The ability of other sulfonium salts, (4-hydroxyphenyl) methyl(4-nitrobenzyl) sulfonium salt and (4-hydroxyphenyl) methyl(1-naphthylmethyl)sulfonium salt, to induce photocrosslinking was also examined. © 1992 John Wiley & Sons, Inc.     

Structure and Mechanical Properties of Ethylene-butene Copolymers

IntroductionThe studies on synthesizing ethylene- butenecopolymershavebeen oneofthemostattracting sub-jects[1,2 ] .A novel ethylene- butene copolymer elas-tomer was synthesized from gas phase polymeriza-tion in ourlaboratory in thepresenceofa new highlyactive catalyst Ti Cl4 ,Ti(OBu) 4/ Mg Cl2 ,Si O2 or Zn-Cl2 / alcohol/ Al R3 ,which has the properties ofoligamerization and copolymerization in site to cat-alyze the gas phase polymerization of ethylene andbutene[3 ] .This kind of copolymer…     

Synthesis of copolymers containing a spiro orthocarbonate moiety and evaluation of the volume change during their cationic crosslinking

Spiro orthocarbonate (SOC) monomers having either an exomethylene group {3,3‐dimethyl‐9‐methylene‐1,5,7,11‐tetraoxaspiro[5.5]undecane (ExoSOC)} or an allyl group {9‐allyl‐3,3‐dimethyl‐1,5,7,11‐tetraoxaspiro[5.5]undecane (AllylSOC)} were radically copolymerized with vinyl monomers at several feed ratios to obtain the corresponding copolymers having SOC moieties in the side chain. The obtained copolymers were crosslinked via the double ring‐opening polymerization of the SOC moieties by a treatment with boron trifluoride etherate. The volume changes during the crosslinking of the copolymers were evaluated by density measurements with a gas pycnometer. As the SOC moiety composition increased, the volume shrinkage during the crosslinking was suppressed, and that finally changed into volume expansion. The volume changes during the crosslinking of the copolymers from AllylSOC were slightly larger than those of the copolymers from ExoSOC. The higher volume expansions in the crosslinking of AllylSOC‐based copolymers were ascribable to the lower steric hindrance around the SOC moieties. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 7040–7053, 2006     

Fully aromatic poly(ether ketone)s bearing macrocycle pendants: Synthesis and crosslinking

This study reports a method to prepare fully aromatic poly(ether ketone) thermosets. The cyclization of 2′,5′‐dimethoxy[1,1′‐biphenyl]‐2,5‐diol and a difluoro monomer was carried out under pseudo high dilution condition. Two types of fully aromatic poly(ether ketone)s with macrocycle were successfully prepared by copolymerization of macrocycle of aryl ether ketone containing hydroxyphenyl groups, 4,4′‐(hexafluoroisopropylidene)diphenol (HFBPA), and 4,4‐difluorobenzophenone. The obtained copolymers have high molecular mass, good solubility, and high glass transition temperatures in the presence of CsF, the crosslinking reaction of copolymers occurred and afforded fully aromatic thermoset poly(aryl ether ketone)s by ring‐opening reaction driven by entropy. After crosslinking, these copolymers show much higher glass transition temperatures, excellent thermal stability, and better mechanical strength. © Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 7002–7010, 2008     

4,4′-二乙炔二苯甲烷与苯乙炔的共聚及共聚物的表征研究

本文做了4,4′-二乙炔二苯甲烷的本体热均聚和催化均聚,并用(Ph_3P)_2PdCl_2为催化剂做了4,4′-二乙炔二苯甲烷与苯乙炔的共聚,对均聚和共聚物中的不溶不熔组分测定了密度、溶胀度、Huggins参数以及交联点间的平均分子量(?)_c。实验表明,该交联聚合物的最良溶剂是四氢呋喃,溶度参数为9.9ca1~0.5。cm~(-1.5),当用四氢呋喃为溶剂时的Huggins参数为0.34,并且在单体摩尔比中4,4′-二乙炔二苯甲烷用量越多,溶胀度越小,交联度越大。红外光谱分析表明,所有均聚及共聚物都为反式结构。     

Copolymers containing a spiro orthoester moiety that undergo no shrinkage during cationic crosslinking

A spiro orthoester with an exomethylene group (exoSOE) was radically copolymerized with acrylonitrile or vinyl acetate at several feed ratios to obtain the corresponding copolymers having spiro orthoester moieties in the side chain. The obtained copolymers could be crosslinked via the double ring‐opening polymerization of the spiro orthoester moieties in their side chain by a treatment with BF₃OEt₂. The volume changes upon the crosslinking of the copolymers were evaluated by density measurements with a micromeritics gas pycnometer. The copolymers experienced less than 1% volume expansion instead of volume shrinkage during typical cationic crosslinking, regardless of the copolymer compositions. Negligible shrinkage was observed during the thermal cationic crosslinking of a film cast from a nitrobenzene solution of the copolymers containing a benzylthiophenium salt as a thermally latent cationic initiator. The constantly low volume changes during the crosslinking of the copolymers from exoSOE probably depended on the almost zero volume change during the cationic polymerizations of spiro orthoester derivatives. This indicates that exoSOE is an effective monomer for crosslinkable polymers without volume changes. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3666–3673, 2006