有机锡催化、无中和水洗合成DOP

以有机锡(Fascat4102)作催化剂,苯酐和辛醇(2-乙基己醇)酯化反应生成邻苯二甲酸二辛酯(DOP),其最佳工艺条件为:酯化温度215～225℃,催化剂加入量2.0‰,过量醇含量17%,脱醇真空为20KPa(绝压),脱醇温度为155℃,活性炭加入量为1‰,省却中和水洗和汽提工序,产品质量可以达到优级品.     

Degradation of polyethylene terephthalate films in the presence of lubricants for HFC 134a: a critical issue for hermetic motor insulation systems

Earlier studies conducted in the use of sealed tubes with polyalkylene glycol lubricants and polyethylene terephthalete (PET) films revealed that the PET films exhibited embrittlement and (visual) degradation. This led to an investigation of PET embrittlement mechanisms with the new lubricants used with HFC 134a. The lubricants studied were three polypropylene glycols (the monol, the diol and the completely end-capped glycols), pentaerythritol ester and a blend of monol and ester. The effects of moisture content, temperature and lubricant structure were studied. All lubricants in this study were of viscosity grade ISO-32 (150 SUS). The results were compared to PET film embrittlement in the presence of CFC 12 and mineral oil. This study reconfirmed the earlier findings that the PET films must be dried to lower than 0.1 wt.% moisture content for use in hermetic systems. This paper discusses the effect of the moisture content of the lubricant and the effect of the lubricant structure on PET films. The dependence of the various mechanisms on temperature is shown. Esters and end-capped polyalkylene glycols are recommended for use with HFC 134a.     

SnO催化、无中和水洗合成DOP的研究

以氧化亚锡 (SnO)作催化剂 ,苯酐和辛醇 (2 乙基己醇 )酯化反应合成邻苯二甲酸二辛酯 (DOP) ,省却中和水洗和汽提工序 ,其最佳工艺条件为 :酯化温度 2 10～ 2 2 0℃ ,催化剂加入量 0 .8% ,过量醇含量 18% ,脱醇真空度为 2 0kPa (绝压 ) ,脱醇温度为 160℃ ,活性炭加入量为 1‰ ,产品质量达到优级品。     

Studies on engineering properties of PVC–PMMA semi‐interpenetrating polymer networks

Semi1 and semi2 interpenetrating polymer networks (IPNs) of PVC and in situ formed PMMA have been synthesized using diallyl phthalate and ethylene glycol dimethacrylate as the crosslinkers of PVC and PMMA, respectively. These two types of IPNs have been compared w.r.t their physical, mechanical, and thermal properties and an endeavor has been made to find a correlation of these properties with the morphology generated in these systems. The semi1 IPNs displayed a decrease in their mechanical parameters and the physical properties as well, while in contrast, the semi2 IPNs exhibited a marginal increase in the corresponding values after an initial drop upto about 15% of crosslinked PMMA incorporation when compared to the crosslinked PVC in the case of semi1 IPN and linear PVC in the case of semi2 IPN. The various samples of semi1 and semi2 IPNs showed a two‐stage degradation typical of PVC, while confirming the increased stability with the samples having higher percentages of PMMA. The influence of crosslinking of the major matrix in semi1 IPN was almost counterbalanced by the influence of crosslinking in the dispersed PMMA phase in the case of semi2 IPN. The softening characteristics as detected by the extent of penetration of the probe, as has been detected by thermomechanical analysis, are in conformity with their mechanicals. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1725–1735, 2005     

Crystalline complex between poly(γ-methyl l-glutamate) and dimethyl phthalate

The crystalline complex between poly(γ-methyl l-glutamate) (PMLG) and dimethyl phthalate (DMP) has been formed in films cast from a solution in dichloroethane. It has the stoichiometry of 1 mol of DMP to three or four residues of PMLG and shows two definite characteristics in X-ray diffraction patterns; one is the large hexagonal unit cell with the edge of around 28 Å and another the ‘extra’ 5.07 Å meridional reflection which can not be interpreted by a PMLG α-helical conformation. The structural examination for the films with various DMP contents is carried out by X-ray, viscoelastic, and d.s.c. measurements and the following structure is proposed for the crystalline complex. Four PMLG are associated to form a group which is hexagonally packed and DMP molecules, located in the gaps between groups, form a specific favourable helical structure along PMLG chains in which the van der Waals stacking of benzene rings of DMP is significant.     

Toughening of cycloaliphatic epoxy resins by poly(ethylene phthalate) and related copolyesters

Poly(ethylene phthalate) (PEP) and poly(ethylene phthalate–co‐ethylene terephthalate) were used to improve the brittleness of the cycloaliphatic epoxy resin 3,4‐epoxycyclohexylmethyl 3,4‐epoxycyclohexane carboxylate (Celoxide 2021?), cured with methyl hexahydrophthalic anhydride. The aromatic polyesters used were soluble in the epoxy resin without solvents and effective as modifiers for toughening the cured epoxy resin. For example, the inclusion of 20 wt % PEP (MW, 7400) led to a 130% increase in the fracture toughness (K_IC) of the cured resin with no loss of mechanical and thermal properties. The toughening mechanism is discussed in terms of the morphological and dynamic viscoelastic behaviors of the modified epoxy resin system. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 388–399, 2002; DOI 10.1002/app.10363     

微波辐照法制备PVC-g-DAP聚合物及其结构与性能表征

采用微波辐照法制备了以聚氯乙烯(PVC)为骨架,邻苯二甲酸二烯丙酯(DAP)为支链的接枝聚合物PVC-g-DAP。通过红外光谱、差示扫描量热分析对聚合物的结构进行了表征,同时对聚合物的流变性能、耐热性和力学性能进行了测试分析。结果表明,DAP在微波辐照下成功接枝到PVC大分子链上,PVC-g-DAP聚合物只有1个Tg,且略高于PVC。PVC-g-DAP聚合物的流变性能较PVC有大幅度改善,同时力学性能、耐热性得到提升。     

邻苯二甲酸丁苄酯的合成

叙述了邻苯二甲酸丁苄酯的市场应用概况．并介绍了二步合成法及一步合成法的实验操作．     

DOP与CPE的含量对BaSO4填充聚氯乙烯基隔音复合材料性能的影响

将邻苯二甲酸二辛酯(DOP)与氯化聚乙烯(CPE)按照不同的质量份数加入到BaSO4填充聚氯乙烯基(PVC)隔音复合材料中,探讨DOP与CPE的含量对BaSO4填充聚氯乙烯基隔音复合材料隔声性能的影响,利用BSWA VS302USB双通道声学分析仪,万能材料试验机,动态热机械分析仪测试了材料的隔声性能,力学性能,阻尼性能。结果显示:当PVC相对质量为100份,DOP为50份,CPE为20份时对低频具有较好的隔声性能,当DOP相对质量为80份,CPE为20份时对中频具有较好的隔声性能,对高频影响较小。     

酞酸二丁酯表面印迹聚合物的合成及其吸附性能

以酞酸二丁酯(DBP)作为模板分子,甲基丙烯酸作为功能单体,乙二醇二甲基丙烯酸酯(EDMA)作为交联剂,在硅胶表面合成分子印迹聚合物(MIPs)。通过红外、热重分析、比表面积测定等对聚合物进行分析和表征;采用静态吸附法对水相中的印迹聚合物的吸附性能进行考察.红外结果表明硅胶表面存在对模板分子具有识别功能的官能团;热重分析证明其良好的热稳定性;通过测定计算印迹膜厚度;静态吸附实验说明印迹聚合物具有良好的吸附性能.