PP-R管材料熔融挤出过程MFR控制研究

分析了PP-R（无规共聚聚丙烯）管材料MFR（熔体流动速率）的变化对力学性能的影响，着重通过双螺杆挤出机研究了PP—R管材料熔融挤出过程中影响MFR变化的因素。结果表明，合适的加工工艺控制和优良的抗氧体系是保证PP-R管材料加工过程中MFR稳定的前提。     

AM／AMPS／AMC16S共聚物的合成与性能

采用氧化－还原引发体系合成了丙烯酰胺（ＡＭ）／２－丙烯酰胺基－２－甲基丙磺酸（ＡＭＰＳ）／２－丙烯酰胺基十六烷磺酸（ＡＭＣ１６Ｓ）三元共聚物，借助红外光谱和差热分析测定了基结构和热稳定性，初步评价了共聚物的溶液性能，结果表明：ＡＭ／ＡＭＰＳ／ＡＭＣ１６Ｓ共聚物热稳定性好，耐温抗盐能力强。     

Synthesis of poly[(methyl methacrylate)-co-acrylamide] modified by titanium-triisopropoxide and their thermal stability

Poly[(methyl methacrylate)-co-acrylamide] of various compositions were previously prepared by the radical copolymerization reaction of methyl methacrylate and the acrylamide monomer in a solvent. The copolymers were modified through a resonating salt by the addition reaction of a chlorotitanium-triisopropoxide; the modified resins are called Ti hybrid copolymers. The chemical structure of acrylamide side chain groups in the Ti hybrid copolymers was confirmed by the ash weight after combustion, the characteristic absorption band determined by Fourier transform infrared spectrophotometry (IR) and elementary analysis (EA). The curing temperature and time of the resins were determined from the change in the insoluble resin weight when the extraction was done with a mixture of acetone and methanol using the curing resin samples. The thermal stability of the Ti hybrid copolymers was evaluated using both the thermal-degradation temperature (T_x) measured by thermogravimetric analysis and the thermal degradation at 130 °C for 720 h. The cured resins improved the weight loss of the resins at the T_x, and exhibited a high thermal stability.     

Phase morphology and impact toughness of impact polypropylene copolymer

Factors influencing the impact toughness of two impact polypropylene copolymers (IPC) with almost the same ethylene content, molecular weight and molecular weight distribution were studied by temperature gradient extraction fractionation (TGEF), scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). The results indicate that poor interfacial adhesion between the disperse phase and the continuous matrix, larger dimensions and non-uniform distribution of disperse phases are main reasons for the low impact toughness of IPC B that possesses of a low content of ethylene-propylene segmented copolymer with long crystallizable PE and PP sequences as a compatibilizer between the disperse phase and the matrix.     

刚柔嵌段共聚物聚苯基喹啉-b-聚苯乙烯的合成

利用原子转移自由基聚合合成了端羧基聚苯乙烯,然后与4-氨基苯乙酮反应,生成末端为乙酰基的聚合物,以P2O5为催化剂,将功能化的聚合物与5-乙酰基-2-氨基二苯甲酮共聚,合成出刚柔嵌段共聚物聚苯基喹啉-b-聚苯乙烯(PPO-b-PS),用红外光谱(IR)、氢核磁共振(1HNMR)和热重分析(TGA)对其结构和性能进行了表征,并在三氟乙酸／二氯甲烷混合溶剂中进行了初步的自组装研究。     

PE-LLD／EVA／Mg（OH）2／复合阻燃剂高效无卤阻燃体系的研究

采用线形低密度聚乙烯/乙烯-醋酸乙烯共聚物作为复合材料主体,表面处理过的氢氧化镁(Mg(OH)2)为主阻燃剂,以微胶囊化红磷和自制硅类阻燃剂为核心的复合阻燃剂为阻燃增效剂,重点探讨了Mg(OH)2和复合阻燃剂的阻燃效果。结果表明,Mg(OH)2与复合阻燃剂并用具有良好的协同效应,当Mg(OH)2用量40份,复合阻燃剂5～7份时,可获得较高的氧指数,垂直燃烧试验通过FV0级,且材料抗静电能力提高,力学性能、加工性能较好。     

核壳型含氟丙烯酸酯共聚乳液

以十二烷基硫酸钠（SDS）和壬基酚聚氧乙烯基醚（OP-10）为复合乳化剂，甲基丙烯酸十二氟庚酯（Actyflon-God）、甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为原料制备了壳层含氟的核壳型丙烯酸酯共聚物乳液。用红外光谱（FT—IR）表征乳胶膜化学组成，用透射电子显微镜（TEM）观察了乳胶粒的微观形态结构，并用X射线光电子能谱（XPS）进行了表面分析。发现氟有向空气与膜面迁徙的现象。通过吸水率表征含氟丙烯酸酯共聚物乳胶膜的表面性能，结果表明含氟量增加使乳胶膜吸水率大大降低。     

The environment of lithium ions and conductivity of comb-like polymer electrolyte with a chelating functional group

The behavior of lithium ions in a comb-like polymer electrolyte with a chelating functional group have been characterized by differential scanning calorimeter (DSC), dynamic mechanical analysis (DMA), Fourier transform infrared (FTIR) spectroscopy, ac impedance and ⁷Li solid-state NMR measurements. The comb-like copolymer is synthesized by poly(ethylene glycol-methyl ether methacrylate) (PEGMEM) and (2-methylacrylic acid 3-(bis-carboxymethylamino) -2-hydroxy-propyl ester) (GMA-IDA). FTIR and ⁷Li solid-state NMR spectra demonstrate the interactions of Li⁺ ions with both the ether oxygen of the PEGMEM and the nitrogen atom of the GMA-IDA segments. Moreover, ⁷Li solid-state NMR shows that the lithium ions are preferentially coordinated to the GMA-IDA segment. The T_g increases for the copolymers doped with LiClO₄. These results indicate the interactions of Li⁺ with both PEGMEM and GMA-IDA segments form transient cross-links. The Vogel-Tamman-Fulcher (VTF)-like behavior of conductivity implies the coupling of the charge carriers with the segmental motion of the polymer chains. The dependence of the maximum conductivity on the composition of the copolymers and the doping lithium ion concentration was determined. The GMA-IDA unit in the copolymer improves the dissociation of the lithium salt, the mechanical strength and the conductivity.     

国外乙丙橡胶生产技术态势及经济评估

对国外乙丙橡胶生产概况，技术特点及发作了简述，并对ＥＰＲ的溶液法，悬浮法，简化悬浮法和气相法等４种生产方法作了技术经济评估。     

Strain-induced ordering of microdomain structures in polystyrene-block-polybutadiene-block-polystyrene triblock copolymers cross-linked in the disordered state

Strain-induced ordering of microdomain structures in cross-linked polystyrene-block-polybutadiene-block-polystyrene (SBS) triblock copolymers was examined by the small-angle X-ray scattering technique. To stretch the SBS samples at elevated temperature above the glass transition temperature of polystyrene, polybutadiene blocks were chemically cross-linked in the disordered state. The initial morphology was disorder-like or bicontinuous due to incompletion of microphase separation in the presence of the chemical cross-links. When the cross-linked SBS samples were mechanically stretched at 130 °C and were further annealed for 24 h under a stretched state, the random domain structures ordered gradually and lamellar-like regularity was finally attained. It was found that the ordering proceeded more for the case of the higher strain.