JA-281对高铝泥浆流变性能的影响

本文主要探讨在高铝泥浆制备过程中，选用不同解凝剂（ＪＡ－２８１，阿拉伯树胶、水玻璃、碳酸钠）的原则，通过对泥浆粘度、稠化系数、吸浆速度等参数的测定，来探索单一添加和复合添加ＪＡ－２８１对高铝泥浆流变性能的影响及其解凝机理。     

纤维素／氯代-1-丁基-3-甲基咪唑（[BMIM]Cl）体系流变性能的研究

纤维素／[BMIM]Cl溶液的流变性能对其湿法纺丝工艺有着重要的参考价值，浓度、温度等因素对其流变行为有很大的影响。利用AR-1000型流变仪对纤维素／[BMIM]Cl溶液的静态流变行为进行了研究，为离子液体法纺制纤维素纤维提供理论依据。     

ABS流变性能研究

采用HAKKE－9000流变仪,对吉化生产的ABS树脂9715A流变性能进行了较为系统的研究,并与台湾奇美股份公司的ABS PA757、大庆生产的ABS750的流变行为进行了对比研究,发现了9715A在流变行为上与PA757的差距,同时将所开发的新牌号ABS树脂在流变性能上与PA757进行了比较,发现从流变性能上所开发的新牌号ABS树脂已达到PA757性能。     

粘接技术在轴瓦修复中的应用

粘接技术在轴瓦修复中的应用胡其生（江西铜业公司东乡铜矿科协，江西省东乡县，３３１８１２）自１９８０年开始，我们将粘接技术应用于巴氏合金轴瓦的修复中，先后修复了φ２７００Ｘ２１００球磨机主轴瓦和ＺＪＫ－３×１．５卷扬机轴瓦，取得了令人满意的粘接效果。粘...     

厚浆型醇酸涂料粘度的测试

厚浆型涂料是一类具有触变性，流变性的涂料，其粘度测试方法不同用于普遍型涂料。本文介绍用上海天平仪器厂生产的ＮＤＪ－１型旋转粘度计测试厚浆型醇涂料的粘度和流变指数的方法。     

甲基丙烯酸甲酯-二甲苯-水含盐体系液液平衡研究

在４０℃，不同浓度的硫酸氢铵盐的条件下，测定了甲基丙烯酯－二甲苯－水体系的液液平衡数据。对所测数据用Ｅｉｓｅｎ－Ｊｏｆｅ方程进行了关联，关联结果与实验值符合较好。     

β-羟基-β-甲基丁酸钙生产工艺的优化控制

介绍了生产β－羟基－β－甲基丁酸钙的生产技术，对温度、pH值、萃取方法等工艺条件进行了优化、降低了生产成本，提高了产品质量。     

反式聚异戊二烯的加工性能和流变行为

研究了反式－1，4－聚异戊二烯（TPI）的加工性能和毛细管流变行为。结果表明，TP有较好的开炼，密炼和挤出性能，易塑化，包辊，挤出物表面光滑，用于橡胶工业时无需改变现有工艺和设备，TPI的流变行为基本符合幂律流体的流变规律，测定的粘流活化能为20－27kJ/mol。     

杂环取代联苯聚醚酮的流变行为

用日本岛津ＡＧ－２０００Ａ毛细管流变仪，研究了自制的杂环取代联苯型聚醚酮的流变行为。求出了表观流动活化能，考察了巴氏效庆和非牛顿行为，对其加工行为进行了分析。     

HDPE 5200B性能研究及加工工艺探讨

通过综合分析国内外几种高密度聚乙烯中空吹塑专用树脂的性能，确定了5200B的生产定位，并对加工工艺进行了探讨，北京燕山石油化工有限公司开发的5200B为均聚高分子量树脂，其熔体流动指数为0．2－0．5g/10min，密度为0．957－0．963g/cm^3，分了量分布在16左右，具有力学性能好，耐热性能高的特点；与共聚物相比具有突出的刚性，与其他均聚中空料相比有较高的耐环境应力开裂值，适用于生产5－50L一般用途的中空制品，5200B加工温度应选择在180℃左右。     

中空容器专用HDPE树脂的结构与性能

分析了进口和国产中空容器专用高密度聚乙烯树脂的基本性能、毛细管流变性能、动态流变性能、熔体强度。结果表明:进口树脂具有相对分子质量分布较窄、支化度较高、耐环境应力开裂性能优异的特点;相对分子质量分布较宽的国产树脂由于高相对分子质量尾端含量高而具有较高黏性、较低弹性,高剪切速率下黏度大,熔体可拉伸性能不如进口树脂。     

Effects of dispersed phase composition on thermoplastic polyolefins

Ternary blends of polypropylene (PP), ethylene–octene copolymer (mPE), and high‐density polyethylene (HDPE) were prepared based on the phase behavior and physical properties of mPE/HDPE binary blends, and the results were interpreted in terms of morphology and both rheological and mechanical properties of the ternary blends as well as the binary blends. It was found that when mPE encapsulates HDPE in the PP matrix, compared to the encapsulation of mPE by HDPE, better blend properties were obtained, presumably because of the compatibilizing effect of mPE between PP and HDPE. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 179–188, 2004     

HDPE管材专用树脂的流变性能

应用动态流变仪、毛细管流变仪和转矩流变仪,对新型双峰高密度聚乙烯(HDPE)管材专用树脂 6380 M进行流变性能测试分析,并与国内外相同压力等级的HDPE管材专用树脂进行比较。结果表明,6380 M的各种流变性能与进口管材专用树脂相当,而与单峰HDPE管材专用树脂相比具有弹性模量低、零切黏度低、拉伸黏度低的流变特性,从而对其加工性能产生影响。6380 M流动性好,其临界剪切速率高,但熔体强度不及单峰HDPE。     

Effect of electron beam irradiation on mechanical properties of high density polyethylene and its blends with sericite‐tridymite‐cristobalite

Some oxygen containing groups (mainly the CO group) are formed on the molecular chain of high density polyethylene (HDPE) during electron beam irradiation in air. The affinity between HDPE and sericite‐tridymite‐cristobalite (STC), the dispersion of STC in the HDPE matrix, and the mechanical properties of the HDPE/STC blend are improved quite a lot by the introduction of polar groups. Compared with HDPE, the tensile and impact strength of electron beam irradiated HDPE (30 kGy)/STC (60/40) are increased to 29.0 MPa and 518 J/m, respectively, from 24.5 MPa and 215 J/m; the tensile and impact strength of irradiated HDPE (30 kGy)/STC (50/50) are 31.1 MPa and 424 J/m, respectively. The Ceast impact test showed that the increase of impact strength was mainly due to the strong interfacial adhesion between irradiated HDPE and STC, thus preventing the spreading of cracks over wide areas. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 243–249, 2000     

Mechanical properties and morphology of the modified HDPE/starch reactive blend

We investigated the effect of reactive blending on the mechanical properties and morphology of high‐density polyethylene (HDPE)/plasticized starch blends. HDPE was chemically modified to enhance the compatibility with the plasticized starch. The modified HDPE, HDPE‐g‐glycidyl methacrylate (GMA), was synthesized by melt reaction of HDPE in the presence of dicumyl peroxide (DCP). A finer dispersion of starch in the HDPE matrix was achieved compared to that in the unmodified HDPE. The amount of GMA groups in the modified HDPE enhanced the miscibility of HDPE/starch blends. We also observed that the amount of glycerin improves the mechanical properties of blends. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3313–3320, 2001     

高密度聚乙烯薄膜流变性能的研究

考察了4种HDPE薄膜料的流变性能。结果表明:4种HDPE薄膜料的熔体均为非牛顿流体,在一定范围内表现为假塑性流体特性,即:表观剪切黏度随剪切速率的增大而降低。HDPE膜料的流动指数随着温度的升高而增大,熔体的非牛顿性减弱。4种薄膜料的黏流活化能随着剪切速率的增大呈升高的趋势。7000F对剪切速率及温度都较为敏感;J50-08对温度敏感,加工时可用温度调节其熔体黏度。在210℃,J50-08的熔体强度最小,加工效率最高;F00952的熔体强度最大而加工效率最低。     

高分子量HDPE薄膜级树脂的开发

综述了国内外高分子量高密度聚乙烯薄膜级树脂的性能、生产工艺、代表牌号、市场、应用领域和发展趋势，重点介绍了几种代表性的生产工艺，并根据我国该薄膜级树脂生产和消费现状，提出了今后发展的建议。     

弹性体对HDPE/E-TMB共混物性能的影响

用自制增韧母料（E-TMB）与高密度聚乙烯（HDPE）热机械共混分别制得HDPE／E-TMB的J系列共混物和S系列共混物,研究了E—TMB中乙丙弹性体M与丁苯弹性体N质量比对共混物力学性能及熔体质量流动速率（MFR）的影响。结果表明,共混物熔体的MFR随母料中N用量的增加逐渐减小;当E-TMB中m（M）／m（N）=80／20时,J类共混物的综合力学性能最好;当m（M）／m（N）=0／100时,s类共混物的力学性能最好。     

Evaluation by IR spectroscopy of the degradation of different types of commercial polyethylene exposed to UV radiation and domestic compost in ambient conditions

Different types of commercial polyethylene films, low-density polyethylene (LDPE), high-density polyethylene (HDPE), and biodegradable polyethylene (BIO-PE), were exposed to UV-B radiation at different exposure time and domestic composting during spring and fall at ambient conditions. The effects of UV-B radiation and domestic composting on LDPE, HDPE, and BIO-PE degradation were characterized by FTIR spectroscopy. LDPE, HDPE, and BIO-PE exposed to UV-B radiation underwent photo oxidation reactions leading to the formation of carbonyl (CO) and vinyl (CH₂CH) groups and hydrophilic surface modification. Also, the exposure of LDPE, HDPE, and BIO-PE to domestic composting at ambient conditions at different seasons suffered biodegradation reactions leading to the formation of polysaccharides. In both different seasons LDPE, HDPE, and BIO-PE underwent partial biodegradation, remaining in the domestic composting as unwanted polymer debris. However, biodegradation in domestic composting is not recommended as feasible disposal routes for nonbiodegradable and commercially labeled as biodegradable PE.     

Effects of the viscosity ratio on polyolefin ternary blends

Polyolefin binary and ternary blends were prepared from polypropylene (PP), an ethylene–α‐olefin copolymer (mPE), and high‐density polyethylene (HDPE) on the basis of the viscosity ratio of the dispersed phase to the continuous phase. In PP/mPE/HDPE blends, fibrils were observed when the dispersed‐phase (mPE/HDPE) viscosity was less than that of PP, or when the viscosity of mPE was less than that of PP, although the viscosity of mPE/HDPE was greater than that of PP. The notched impact strength and mechanical properties such as the yield strength, flexural modulus, and hardness of PP/mPE binary blends further increased with the addition of HDPE according to the type of HDPE. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 4027–4036, 2004