不同端基联苯型聚醚醚酮(PEDEK)齐聚物的合成

采取亲核取代反应合成了含有羟端基和不含羟端基的两种线性联苯型聚醚醚酮(PEDEK)齐聚物,并采用MS,¹HNMR,ICP,IR,DSC和WAXD等方法对齐聚物进行表征.研究发现,含羟端基的齐聚物因分子间存在氢键,其X射线衍射峰峰位和峰形与聚合物十分相似,而不含羟端基齐聚物的X射线衍射峰与聚合物相差较大.     

硅烷化学改性环氧涂层的耐蚀性能

利用"活性"与"非活性"硅烷化学改性环氧涂层以提高其耐蚀性."活性"硅烷指含有可以与环氧树脂的环氧端基发生开环反应官能团的硅烷,通常为氨基硅烷;"非活性"硅烷指不与环氧端基发生反应,但在有机锡催化剂存在下可与环氧树脂骨架上的羟基发生缩合反应的硅烷.红外光谱显示,两类硅烷均可成功接枝在环氧树脂上.电化学阻抗谱(EIS)和加速腐蚀试验(Machu试验)测试表明,经硅烷化学改性后的环氧涂层均能提高其耐蚀性能.     

κ-型卡拉胶/聚乙烯吡咯烷酮共混水凝胶的辐射制备及性质研究

采用辐射技术制备了κ-型卡拉胶 ( KC) /聚乙烯基吡咯烷酮 ( PVP)共混水凝胶 ,研究了共混凝胶内 KC含量、PVP的分子量和辐照剂量等对 KC/ PVP共混水凝胶性质的影响 .实验发现 ,KC与高分子量的 PVP( k-90 )共混后在一定剂量范围内辐照可得到高强度、高溶胀行为的 KC/ PVP共混水凝胶 ,随着共混凝胶内KC含量的增加 ,凝胶强度及溶胀性能均显著提高 .分析表明 ,KC与高分子量的 PVP共混后 ,在较低剂量下 KC的降解被抑制 ,从而获得一种由物理交联的 KC和化学交联的 PVP形成的互穿网络 ( IPN)凝胶 .     

k-型卡拉胶/聚乙烯吡咯烷酮共混水凝胶的辐射制备及性质研究

采用辐射技术制备了κ-型卡拉胶(KC)/聚乙烯基吡咯烷酮(PVP)共混水凝胶,研究了共混凝胶内KC含量、PVP的分子量和辐照剂量等对KC/PVP共混水凝胶性质的影响.实验发现,KC与高分子量的PVP(k-90)共混后在一定剂量范围内辐照可得到高强度、高溶胀行为的KC/PVP共混水凝胶,随着共混凝胶内KC含量的增加,凝胶强度及溶胀性能均显著提高.分析表明,KC与高分子量的PVP共混后,在较低剂量下KC的降解被抑制,从而获得一种由物理交联的KC和化学交联的PVP形成的互穿网络(IPN)凝胶.     

聚酚酞醚砜-聚硅氧烷-聚醚氨酯多嵌段聚合物

<正> 合成了端异氰酸酯基聚硅氧烷-聚醚氨酯嵌段预聚物和端羟基酚酞醚砜齐聚物,探索了上述预聚物与齐聚物间的活泼氢转移加成反应,对所得的多嵌段聚合物做了初步的结构形态表征。 试验用单体:酚酞、4,4′-二氯二苯砜、TDL_(2,4)、MDI、低分子量聚氧化丙烯二醇N-     

环氧树脂共混物相结构的调控方法研究

研究了环氧树脂(E51)/聚砜(PSF)共混物相结构的控制方法.通过抑制相分离、控制预固化的反应程度控制环氧树脂的分子量,固化后可获得不同的共混物相结构.依据红外测定的固化反应程度设定固化程序,可有效控制共混物的相结构.加入促进剂三氟化硼-乙基胺(BTF-EA)可提高固化反应速度,使相分离结构在早期被抑制,以获得小微区的相结构.     

动态固化聚丙烯/环氧树脂共混物的研究

将动态硫化技术应用于热塑性树脂 热固性树脂体系 ,制备了动态固化聚丙烯 (PP) 环氧树脂共混物 .研究了动态固化PP 环氧树脂共混物中两组分的相容性、力学性能、热性能和动态力学性能 .实验结果表明 ,马来酸酐接枝的聚丙烯 (PP g MAH)作为PP和环氧树脂体系的增容剂 ,使分散相环氧树脂颗粒变细 ,增加了两组分的界面作用力 ,改善了共混物的力学性能 .与PP相比 ,动态固化PP 环氧树脂共混物具有较高的强度和模量 ,含 5 %环氧树脂的共混物拉伸强度和弯曲模量分别提高了 30 %和 5 0 % ,冲击强度增加了 15 % ,但断裂伸长率却明显降低 .继续增加环氧树脂的含量 ,共混物的拉伸强度和弯曲模量增加缓慢 ,冲击强度无明显变化 ,断裂伸长率进一步降低 .动态力学性能分析 (DMTA)表明动态固化PP 环氧树脂共混物是两相结构 ,具有较高的储能模量 (E′)     

含硅氢键聚二硅氧烷/聚醚共混聚合物电解质 I. 离子电导率研究

首次采用新型有机硅聚合物——侧链含一半硅氢键的羟基封端聚二硅氧烷(PSEMH)与聚氧乙烯醚(PEO)作为基质, 通过溶液浇铸法制备了PEO-PSEMH-LiClO4全固态共混聚合物电解质膜. 交流阻抗谱实验测定结果表明PSEMH与PEO共混作为聚合物电解质的基质可以显著提高共混聚合物电解质的离子电导率. PSEMH含量为25%, O/Li＋为12∶1时, 共混聚合物电解质具有最大离子电导率2.7×10－5 S•cm－1 (28 ℃). PSEMH的引入一方面可以显著地抑制PEO的结晶性能, 另一方面PSEMH分子链节中的二硅醚氧原子与Li＋间具有配位作用, 且参与了共混聚合物电解质锂离子迁移运动.     

热塑性聚醚酰亚胺改性四官能度环氧树脂的相分离研究──固化剂用量的影响

以DSC、TRLS和SEM等方法研究了固化剂DDS用量对苯端基聚醚酰亚胺(P-PEI)改性4,4'-二氨基二苯甲烷四缩水甘油环氧树脂(TGDDM)体系的固化速率及相结构的影响.结果表明,20phrP-PEI改性环氧体系在150℃固化时,随DDS量增加,固化反应速率增大,相分离时间提前,形成了不同的相结构,解释了DDS量对粘接剪切强度的影响.     

聚酯-聚醚嵌段共聚物同环氧树脂共混改性的研究

聚酯-聚醚多嵌段共聚物同少量的环氧树脂等共混,可以改善共混物作热熔胶使用时的剪切强度、剥离强度和热光老化性能。本文研究了共混条件,同时根据IR、DTA、TM和TG实验结果,提出了在熔融粘接过程中,环氧基同共聚物端羟、羧基反应的可能性。     

Prediction of characteristic properties of crude oil blending with ANN

Mineral oil is one of the most important materials on earth and it is used widely for its several features. Mineral oils derived from petroleum products are commonly used to decrease the friction effects in machine parts and, thus, they both prevent wear/overheating and facilitate power transmission. In this study, various binary mixtures of various base oils (SN-80, SN-100, SN-150, SN-50, SN-500) were prepared at different volumetric ratios. Kinematic viscosity (at 40°C and 100°C), viscosity index, flash point, pour point, and density (at 20°C) measurements were performed for characterization of the prepared mixtures. These values were modeled by an artificial neural network (ANN) and the model was tested with root mean squared error (RMSE), mean absolute percentage error (MAPE, %), and regression coefficient (R) values. A higher value of correlation coefficient and smaller values of MAPE and RMSE indicate that the model performs better. For predicting kinematic viscosity at 40°C, correlation coefficients were calculated for training and testing the network as 0.9999 and 0.9995, respectively. Respective MAPE values were determined as 1.011% and 1.8771%.     

PET共混改性研究

综述了国内外PET共混改性的研究现状 ,并介绍了近年来PET共混研究的新发展     

聚苯乙烯共混改性研究进展

综述了近年来用普通塑料,工程塑料和弹性体等共混改性聚苯乙烯的进展情况,提出了用纳米材料和反应挤出改性聚苯乙烯的构想。     

A facile one‐pot reactive solution blending approach for main‐chain donor–acceptor polymeric materials

A high‐temperature solution blending process has been used to synthesize a series of copolymers incorporating varying mole ratios of perylenebisimide (PBI) into the backbone of an engineering thermoplastic polyester [poly(1,4‐cyclohexylenedimethylene‐1,4‐cyclohexanedicarboxylate)] (PCCD). A random donor–acceptor copolymer incorporating oligo(p‐phenylene vinylene) (OPV) and PBI was also synthesized. The chemical incorporation of these chromophores into PCCD was confirmed by carrying out the melt condensation using 1,4‐cyclohexanedimethanol and 1,4‐dimethylcyclohexane dicarboxylate with hydroxyl‐functionalized PBI and OPV derivatives. Higher extent of incorporation of PBI (35 mol %) could be achieved using the blending approach retaining solubility, film‐forming ability, and higher molecular weights. The PBI polymers produced using the two different approaches exhibited structural variations. The polymers formed from the solution blending approach had a semicrystalline nature with blocks of PCCD separating the PBI units, whereas those produced using the melt condensation route were amorphous polymers. This structural variation was reflected in their photophysical properties also with the reactive solution‐blended polymers exhibiting higher fluorescence quantum yields. These results demonstrate the easy incorporation of suitably functionalized donor and acceptor moieties into a completely aliphatic polyester backbone to produce free‐standing films of hitherto nonprocessable polymers. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013     

聚β-羟基烷酸酯共混改性研究进展

聚β－羟基烷酸酯作为一种生物降解、生物相容的微生物合成材料,具有广阔的应用前景,但其成本高、质脆,特别是加工温度区间窄,大大限制了其应用。就宾结构特点,质脆的原因,共混改性的手段、尤其是近几年混改性的进展作了综述。     

Research progress in toughening modification of poly(lactic acid)

Renewable poly(lactic acid) (PLA) exhibits high strength and stiffness. PLA is fully biodegradable and has received great interest. However, the inherent brittleness of PLA largely impedes its wide applications. In this article, the recent progress in PLA toughening using various routes including plasticization, copolymerization, and melt blending with flexible polymers, was reviewed in detail. PLA toughening, particularly modification of impact toughness through melt blending, was emphasized in this review. Reactive blending was shown to be especially effective in achieving high impact strength. The relationship between composition, morphology, and mechanical properties were summarized. Toughening mechanisms were also discussed. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011.     

DCLR与TLA共混改性沥青的性能对比

以SK-90沥青为基质沥青,分别加入相同掺量(与沥青质量比为5%、10%、15%和20%)的DCLR和TLA,利用SHRP PG、针入度分级体系、红外光谱仪和凝胶色谱仪对比分析DCLR和TLA共混改性沥青的宏观性能和微观结构的变化。结果表明,DCLR和TLA的加入均可以改善沥青的高温性能,但对沥青的低温性能和疲劳性能产生一定的不利影响。同时,根据DCLR和TLA共混改性沥青的官能团和分子量分布的变化可以判断DCLR和TLA对沥青的改性作用主要为物理改性,在某种程度上,DCLR不能完全替代TLA。     

Novel Superlattices via Blending of Asymmetric Triblock Terpolymers with Diblock Copolymers

The formation of superlattices in blends of a series of asymmetric BSV triblock terpolymers and symmetric SV or VC diblock copolymers is investigated with S being polystyrene, B being poly(1,2‐butadiene), V being poly(2‐vinylpyridine), and C being poly(cyclohexyl methacrylate). All of these triblock terpolymers and diblock copolymers by themselves self‐assemble into lamellae. Apart from various core shell morphologies, in these blends some new unexpected superstructures were obtained.

A TEM micrograph of a 50/50 blend of B₃₀S₅₈V with S₄₅V.     

多相聚合物共混过程中的相结构研究及其在线分析

叙述了多相聚合物共混过程中相结构的形成及变化机理,并综术了多相聚合物共混加工在线分析的几种方法。介绍了天津大学自己研制的动态激光背散射在线分析系统。     

聚癸二酸丙三醇酯对聚乳酸的改性

以丙三醇和癸二酸为单体通过熔融缩聚制得了聚癸二酸丙三醇酯(PGS),并用其预聚物(p-PGS)对聚L-丙交酯(PLLA)进行共混改性.利用傅立叶变换红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)及凝胶渗透色谱(GPC)法对P-PGS的结构进行表征,并研究了改性后材料的力学性能、两相相容性、亲水性能和细胞相容性.结果表明:P-PGS具有支化分子结构,分散系数约为2.7;共混改性后的材料弹性模量和拉伸强度均有所下降,而断裂伸长率从7 %显著提高到150%左右;PLLA/PGS属于海岛式共混结构,PGS以小于10μm的尺寸均匀分布在PLLA基体中;共混后材料的亲水性也有一定的提高,且几乎保持了PLLA原有的细胞相容性.