聚乙二醇改性物对高交联度不饱和聚酯的增韧改性

合成了一种含有反应活性端基的聚乙二醇,并用之对高交联度不饱和聚酯进行增韧。结果表明,含有反应性马来酸酐端基的聚乙二醇参与了不饱和聚酯的固化反应,可在交联网络中构成不同长度的柔性链段,从而显著地提高了不饱和聚酯的韧性。将其应用于BMC材料的增韧也获得了满意的增韧效果。     

双马来酰亚胺改性不饱和聚酯

报导了用4，4’—双马来酰亚胺二苯甲烷改性工业不饱和聚酯的研究。对比了改性与未改性不饱和聚酯的性质，表征了交联前后不饱和聚酯的特性。研究结果表明，加入双马来酰亚胺不仅改进了不饱和聚酯的性能，也加速了交联反应。     

差示扫描量热法研究不饱和聚酯固化反应

本文用国产CDR-1型差动热分析仪(简称DSC),采用恒温和动态两种方法,研究3301不饱和聚酯固化反应,得到恒温和动态下的热效应和固化工艺参数,并通过阿累尼乌斯方程和基辛格方程,分别求出恒温和动态固化反应的表观活化能E。      

环氧改性不饱和聚酯

通过粘度、超声速率及折射率研究氯仿中的环氧／不饱和聚酯混合物的可混性；应用于防水材料的不饱和聚酯树脂的组成；反复使用的聚乙烯基对苯二酯中得到的乙烯基酯存在下的不饱和聚酯压缩特性及固化性能；环氧聚合物改性光敏性不饱和聚酯的制备；耐热双马来酰亚胺改性不饱和聚酯树脂；用于生产储存稳定的不饱和聚酯树脂的含引发剂的微胶囊.     

不饱和超支化聚酯的合成与表征

采用丙烯酸对端羟基超支化聚酯进行端基改性,使端基由羟基变成双键.并采用红外光谱和核磁氢谱对原料和产物的结构进行表征,证明得到了端基为双键的不饱和超支化聚酯,通过核磁氢谱的峰面积计算出基团的转化率在 90％以上.该不饱和超支化聚酯有望应用于自由基反应的交联剂和光固化材料.     

不饱和聚酯树脂部分

20062011 应用于聚合物改性的环糊精：环戊二烯／甲基化-β-环糊精络合物与不饱和聚酯的DielsAlder加成化合物及其制得的新型聚假轮烷环戊二烯可进入甲基化-β-环糊精的空穴中，形成稳定的水容性络合物。我们成功地应用这种合成的络合物，与由聚乙二醇和马来酸酐制得的水溶性不饱和聚酯进行了Diels-Alder加成。反应得到了一种新型聚假轮烷。     

V-POSS/UPR非等温固化动力学与物理性能

为了提高不饱和聚酯树脂(UPR)的性能，本文中以乙烯基笼型倍半硅氧烷(V-POSS)改性不饱和聚酯树脂，用非等温 DSC法研究了UPR和5% V-POSS/UPR体系的固化反应动力学以及表观反应活化能与转化率之间的关系，测定了玻璃钢层压板的力学性能和电性能。结果表明，加入V-POSS固化反应E_a随反应程度增加而降低，通过使用两参数Šesták-Berggren(S-B)模型描述固化反应过程，得到了反应动力学方程。当V-POSS质量分数为5%时玻璃钢层压板拉伸强度达到最大值，提高了17.6 MPa，冲击强度随V-POSS加入量增加而降低，但在10%时冲击强度有所上升。层压板电性能随 V-POSS加入量增加而提高，其中体积电阻率和表面电阻率提高1～2个数量级。     

不饱和聚酯复合材料的改性研究

综述了不饱和聚酯复合材料改性方面的最新发展．介绍了不饱和聚酯复合材料在表面、界面、低收缩改性以及天然纤维和无机物增强方面的研究,并着重介绍了不饱和聚酯／层状硅酸盐蚋米复合材料的制备和性能．     

改性不饱和聚酯酰胺脲紫外光固化涂料的性能研究

采用本体熔融聚合法,用二聚酸时不饱和聚酯酰胺脲树脂进行改性,并用红外光谱法对结构进行了表征.以甲基丙烯酸甲酯(MMA)为活性稀释剂,研究了不同稀释剂浓度,不同光引发剂类型和浓度对涂膜性能的影响.并对改性前后的性能进行对比,结果表明:由改性后的树脂制备的紫外光固化涂料克服了不饱和聚酯酰胺脲涂层不够柔软,抗冲击强度差,耐水性差的缺点,得到了物理性能优异,易于施工且环境友好的光固化涂料.     

改性凹凸棒石-不饱和聚酯复合材料的热性能研究

为研究改性凹凸棒石的掺入对不饱和聚酯热性能的影响,采用十八烷基三甲基氯化铵(OTAC)对凹凸棒石进行有机改性,然后制备改性凹凸棒石-不饱和聚酯复合材料,并用红外光谱(IR)和X射线衍射(XRD)等分析手段对改性效果进行表征,利用差热(DTA)、热重(TG)同步热分析仪研究复合材料的热性能,探究改性前后凹凸棒石的掺量对复合材料热起始温度的影响。结果表明:改性凹凸棒石-不饱和聚酯复合材料的热稳定性明显优于凹凸棒石-不饱和聚酯复合材料和纯不饱和聚酯,掺入改性凹凸棒石的最佳质量分数8.4%左右。     

Functional peroxides and peroxy oligoesters on the basis of pyromellitic dianhydride

A series of peroxy oligomers has been synthesized on the basis of pyromellitic dianhydride and tetrachloroanhydride of pyromellitic acid by condensation with polyethylene glycols and tert-butylhydroperoxide. The resulting oligoesters contain two types of functional groups: carboxylic – which can participate in ionic reactions and peroxide – able to initiate certain radical processes. Concentrations of these groups depend on the method of synthesis, the nature of starting monomers, and the molecular mass of polyethylene glycol. Structures of oligoesters have been determined by IR and ¹H-NMR spectroscopy. The oligoesters are able to form three-dimensional networks when heated to 400 K. A mechanism of the network formation is proposed. These materials can be used as curing agents for unsaturated polyesters and also for epoxy + unsaturated polyester resin compositions. Electronic Publication     

CaSO4晶须对不饱和聚酯腻子的改性研究

使用不饱和聚酯树脂、固化剂和实验室自制的CaSO4晶须对不饱和聚酯腻子进行改性,考察不同粒径CaSO4晶须对聚酯腻子性能的影响.根据实验结果,200nm改性CaSO4晶须当加入量为2%时对腻子的抗冲击性、硬度、收缩率有明显改善.     

真空导入模塑工艺树脂体系化学流变特性及流变模型

采用DSC热分析技术和黏度实验方法,研究了真空导入模塑工艺专用不饱和聚酯树脂体系(Palatal1777-G-4)的固化特性和化学流变特性,建立和对比了树脂体系的修正双阿累尼乌斯流变模型和工程黏度模型,并依据所建立的流变模型预报 Palatal1777-G-4树脂体系的真空导入模塑工艺操作窗口。对比结果表明：修正双阿累尼乌斯流变模型和工程黏度模型分别能较好地反映树脂体系凝胶点前的低黏度平台特性和凝胶点后的黏度变化规律,结合两模型可有效模拟树脂体系在不同工艺条件下的黏度行为,准确预报树脂体系的低黏度平台工艺窗口,为优化真空导入模塑工艺参数和保证制品质量提供科学依据。模型预测结果表明,Palatal1777-G-4 树脂体系在20～38℃温度范围内满足真空导入模塑工艺操作的基本要求,黏度低于300 mPa·s的工艺操作时间长于30 min。     

Physiochemical properties of polymer mortar composites using resins derived from post-consumer PET bottles

In this study, post consumer polyethylene terephthalate (PET) waste bottles were used, to produce unsaturated polyester resin by depolymerization through glycolysis reaction with diethylene glycol. The glycolysis was optimized by varying temperature, amount of catalyst, and the glycolysis time. The glycolysis product bis-2-hydroxy ethylene terephthalate (BHET) monomers were converted into unsaturated polyesters, which were diluted with styrene to produce the unsaturated polyester resin. These resins were used to produce polymer mortar and cured using benzoyl peroxide as an initiator and N,N-diethyl aniline as promoter. These polymer mortar composites were analyzed for physiochemical properties using carbon, hydrogen and nitrogen (CHN) elemental analysis, Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis–differential thermal analysis (TGA–DTA). The polymer mortar so produced has a compressive strength of about 10 MPa and may be used in applications such as pavements, median barriers, sewer pipes, etc. Its tensile strength at 45 days of age is 18–23% of its compressive strength at the same age.     

Interfacial effects in glass fibre composites as a function of unsaturated polyester resin composition

The tensile strengths of polyester laminates have been examined with respect to E-glass fibre–unsaturated polyester resin (UPR) interfacial properties. The tensile strengths of the polyester laminates were determined as a measure of interfacial bond strength. In accordance with the principles of Factorial Design several compositions of UPRs were prepared varying three factors: the saturated to unsaturated acid ratio, the branched to linear ether glycol ratio and the amount of styrene. The influence of UPR composition on the tensile strength of polyester laminates is owing to the effects on flexibility of the cured UPR. The compositions with lower degrees of unsaturation and with higher amount of linear ether glycol increase the flexibility of UPRs, improve adhesion with E-glass fibre and consequently increase the tensile strength of the polyester laminates.     

Characterization of polyester composites from recycled polyethylene terephthalate reinforced with empty fruit bunch fibers

Unsaturated polyester resin (UPR) was synthesized from recycled polyethylene terephthalate (PET) which acted as a matrix for the preparation of UPR/empty fruit bunch fibers (EFB) composite. Chemical recycling on fine pieces of PET bottles were conducted through glycolysis process using ethylene glycol. The unsaturated polyester resin (UPR) was then prepared by reacting the glycolysed product with maleic anhydride. FTIR analysis of glycolyzed product and prepared UPR showed that cross-links between unsaturated polyester chain and styrene monomer occurred at the unsaturated sites which resulted in the forming of cross-linking network. The preparation of UPR/EFB composite was carried out by adding EFB into prepared UPR matrix. The effects of surface treatment on EFB with sodium hydroxide solution (NaOH), silane coupling agent and maleic anhydride (MA) were then studied. The experimental results showed that treated EFB have higher values of tensile and impact strength compared with untreated EFB. The best results were obtained for silane treatment followed by MA and NaOH treatments where the tensile strength was increased by about 21%, 18% and 13% respectively. SEM micrographs of the tensile fracture surfaces of UPR/EFB composite also proved that treatment on EFB has increased the interfacial adhesion between the fiber and UPR matrix compared to the untreated UPR/EFB composite.     

不饱和聚酯树脂体系化学流变特性研究

采用DSC热分析技术和黏度实验方法,研究LSP-8020B不饱和聚酯树脂体系的固化特性和化学流变特性,建立与实验数据较为吻合的工程黏度流变模型.模型可揭示树脂体系在不同工艺条件下的黏度变化规律,定量预报树脂体系的低黏度平台工艺窗口,为该树脂体系真空导入模塑工艺参数优化和保证大型复合材料构件整体成型质量提供一定的科学依据.