HDP—PVC／ABS合金材料的研究

研究了高聚合度聚氯乙烯（ＨＤＰ－ＰＶＣ）／ＡＢＳ二元体系力学性能以及添加第三组分对合金材料力学性能的影响。结果表明：ＨＤＰ－ＰＶＣ／ＡＢＳ配比为１００／２５时,共混物的综合性能好,体系能形成较完善的海岛结构;ＨＤＰ－ＰＶＣ／ＡＢＳ／ＭＢＳ体系中,ＭＢＳ能改善多元体系的界面性能,提高合金材料的综合性能;ＨＤＰ－ＰＶＣ／ＡＢＳ／ＣＰＥ体系中,ＣＰＥ能使形成网状结构和海岛结构共存的合金体系,提高合金材料     

mLLDPE及mLLDPE／LDPE共混物薄膜性能研究

研讨了茂金属线型低密度聚乙烯（ｍＬＬＤＰＥ）薄膜和ｍＬＬＤＰＥ与低密度聚乙烯（ＬＤＰＥ）共混物薄膜的物理性能和光学性能,并与传统的ＬＬＤＰＥ薄膜和ＬＬＤＰＥ／ＬＤＰＥ共混物薄膜进行了比较,表明ｍＬＬＤＰＥ薄膜和ｍＬＬＤＰＥ／ＬＤＰＥ共混物薄膜的性能优于传统的ＬＬＤＰＥ薄膜和ＬＬＤＰ／ＬＤＰＥ共混物薄膜,指出在ｍＬＬＤＰＥ中混合１０％ＬＤＰＥ,对薄膜性能影响不大。     

利用废旧塑料制土工排水带的研究

本文通过对回收ＬＤＰＥ／ＣａＣＯ３填充、回收ＬＤＰＥ／ＨＤＰＥ共混、回收ＬＤＰＥ／ＰＰ共混体系的研究，得出了较好力学性能的土工排水带板芯的配方．     

中国合成树脂及塑料文摘

ＨＤＰＥ／ＡＳ／共混体系形态及力学性能／魏秀萍（华南理工大学材料学院高分子系）／塑料工业。1999,2 7（4）：12～ 13转19。研究了相容剂ＬＤＰＳ ｇ ＡＳ对ＨＤＰＥ／ＡＳ共混体系形态及力学性能的影响。ＨＤＰＥ／ＬＤＰＥ在动态保压注射成型中的自增强行为研究／张弓（四川大学塑料工程系）／塑料工业。1999,2 7（4）：16～ 19。研究在ＨＤＰＥ中加入适量ＬＤＰＥ,经动态保压注射成型,试样的强度与模量得到明显的提高。同样,试样的韧性也较纯ＨＤＰＥ自增强试样明显增加。ＨＤＰＥ／ＬＤＰＥ（80 2 0 ）时,自增强试样的拉伸强…     

LDPE/SBS-g-MAN增韧PA-6和增容PA-6/LDPE的研究

对ＭＡＨ接枝ＬＤＰＥ／ＳＢＳ制备复合相容剂ＬＤＰＥ／ＳＢＳ ｇ ＭＡＮ及其对ＰＡ ６的增韧作用和对ＰＡ ６／ＬＤＰＥ的增容作用进行研究,并对菜混物的力学性能、微观形态结构进行了分析     

本世纪末我国合成树脂发展概况

本文以最新的信息资料，介绍对我国１９９０～２０００年合成树脂ＬＤＰＥ、ＬＬＤＰＥ、ＨＤＰＥ、ＥＶＡ、ＣＰＥ、ＰＰ、ＰＶＣ（含ＰＶＤＣ）、ＰＳ、ＡＢＳ、ＡＣＳ、ＭＢＳ、ＳＢＳ的发展状况，新建装置，主产能力，以及近年来开发成功的新产品及应用等，并做了全面系统的分析和预测．     

本世纪未我国合成树脂发展概况

本文以最新的信息资料，介绍对我国１９９０－２０００年合成树脂ＬＤＰＥ、ＬＬＤＰＥ、ＨＤＰＥ、ＥＶＡ、ＣＰＥ、ＰＰ、ＰＶＣ（含ＰＶＤＣ）、ＰＳ、ＡＢＳ、ＡＣＳ、ＭＢＳ、ＳＢＳ的发展状况，新建装置，生产能力，以及年近来开发成功的新产品及应用等，并做了全面系统的分析和预测。     

顺酐化三元乙丙橡胶改性PC／LDPE共混体系的研究

低密度聚乙烯（ＬＤＰＥ）可以改善聚碳酸酯（ＰＣ）的加工性能,并能在一定上改善ＰＣ的力学性能。顺酐化三元乙丙橡胶（ＭＥＰＤＭ）对ＰＣ／ＬＤＰＥ有增容作用,在ＰＣ／ＬＤＰＥ体系中加入１％左右的ＭＥＰＤＭ即可使冲击强度增加７０％。     

2000年我国合成树脂展望

本文以最新的情报信息资料，全面地，系统地综述了我国１９９０－２０００年合成树脂ＬＤＰＥ，ＬＬＤＰＥ，ＨＤＰＥ，ＥＶＡ，ＣＰＥ，ＰＰ，ＰＶＣ（含ＰＶＤＣ），ＰＳ（ＧＰＰＳ，ＨＩＰＳ，ＥＰＳ），ＡＢＳ，ＡＣＳ，ＭＢＳ，ＳＢＳ等发展情况，新建装置，生产能力；近年来开发成功的新产品，特性及应用；并对合成树脂发展予以展望。     

LDPE／BR微孔塑料的制备和性能研究

讨论了ＬＤＰＥ／ＢＲ并用比、交联剂、发泡剂及助剂、填料和共混温度、发泡成型温度对ＬＤＰＥ／ＢＲ并用比、交联剂、发泡剂及助剂、填料和共混温度、发泡成型温度对ＬＤＰＥ／ＢＲ微孔塑料性能、结构的影响。结果表明：ＬＤＰＥ／ＢＲ（８０／２０质量比）１００份，ＤＣＰ０９份，ＡＣ３５份，复合发泡助剂３份，活性ＣａＣＯ３２５份，共混温度１１０℃，发泡成型温度１７０℃下，可制得性能优良的微孔塑料。扫描电镜、光学显微镜观察结果表明在上述条件下ＬＤＰＥ／ＢＲ胶料混合均匀，微孔塑料孔眼小、分布较均匀     

Extrudate swell and texture of PS,LDPE, ABS,PVC melts and their blends in extrusion capillary flow using a magnetic die

The extrudate swell behavior and extrudate texture of various thermoplastic melts, namely, polystyrene (PS), low‐density polyethylene (LDPE), acrylonitrile‐butadiene styrene (ABS) copolymer, poly(vinyl chloride) (PVC), and their blends, were examined weith a magnetic die system in a constant‐shear‐rate capillary rheometer at a shear rate range 5–28 s^?1 and a temperature range 170–230 °C. The extrudate swell results obtained from the magnetic die were then compared with those produced by a nonmagnetic die. The results showed that the extrudate swell increased with shear rate, but decreased with temperature. In a pure polymer system, up to 25% increase in the extrudate swell was observed with the application of the magnetic field to the PS melt, and the effect decreased in the order ABS > LDPE > PVC. The extrudate swell changes were associated with the changes in rheological properties of the melts. The extrudate textures of the ABS and PVC melts were improved by the magnetic field. In PS/LDPE or PS/ABS blend, it was found that the magnetic die resulted in higher values of the extrudate swell than the nonmagnetic die for all blends, the magnetic effect being less as the LDPE or ABS content was increased. For PS/LDPE system, the extrudate swell of the PS melt did not change much with addition of 20% LDPE, but slightly decreased at the LDPE loading of 40%. At higher LDPE loadings, the extrudate swell increased towards the value of the pure LDPE melt. For PS/ABS system, the extrudate swell ratio progressively decreased with increasing ABS content. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 509–517, 2002     

Boiling water aging of polycarbonate and polycarbonate/acrylonitrile–butadiene–styrene resin and polycarbonate/low‐density polyester blends

The effects of boiling water on the mechanical and thermal properties and morphologies of polycarbonate (PC), PC/acrylonitrile–butadiene–styrene resin (PC/ABS), and PC/low‐density polyester (PC/LDPE) blends (compositions of PC/ABS and PC/LDPE blends were 80/20) were studied. PC and the PC/ABS blend had a transition from ductile to brittle materials after boiling water aging. The PC/LDPE blend was more resistant to boiling water aging than PC and the PC/ABS blend. The thermal properties of glass‐transition temperature (T_g) and melting temperature (T_m) in PC and the blends were measured by DSC. The T_g of PC and PC in the PC/ABS and PC/LDPE blends decreased after aging. The T_g of the ABS component in the PC/ABS blend did not change after aging. The supersaturated water in PC clustered around impurities or air bubbles leading to the formation of microcracks, which was the primary reason for the ductile–brittle transition in PC, and the microcracks could not recover after PC was treated at 160°C for 6 h. The PC/ABS blend showed slightly higher resistance to boiling water than did PC. The highest resistance to boiling water of the PC/LDPE blend may be attributed to its special structural morphology. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 589–595, 2003     

Study of the influence of adding styrene–ethylene/butadiene–styrene in acrylonitrile–butadiene–styrene and polyethylene blends

This work studies the recovery of two grades of acrylonitrile–butadiene–styrene (ABS) contaminated with low‐density polyethylene (LDPE), by adding styrene–ethylene/butadiene–styrene (SEBS). To simulate contaminated ABS, virgin ABS was mixed with 1, 2, 4, and 8% of LDPE and then extruded at 220°C. After this, the ABS with the highest percentage of LDPE (8%) was mixed with 1, 2, 4, and 8% of SEBS and then extruded. Different blends were mechanically, rheologically, optically, and dimensionally characterized to study how different percentages of LDPE and SEBS modify their properties. The results obtained show how the tensile strength, Young modulus, elongation, and impact strength linearly decrease as the LDPE amount increases, for both natural and black ABS. Through the addition of SEBS to contaminated ABS, it is possible to improve its impact strength and elongation values nearly to those of virgin ABS. However, its tensile strength and Young modulus show no improvement, and even show a slight reduction. Regarding the rheological properties, the LDPE contamination in ABS causes a remarkable decrease in viscosity, and adding SEBS to the blend lowers its viscosity even further for both natural and black grades. This reduction is not a negative aspect, but rather quite the reverse, as the more fluid the material, the easier the mold injection process becomes. POLYM. ENG. SCI., 54:1313–1324, 2014. © 2013 Society of Plastics Engineers     

Studies on binary and ternary blends of polypropylene with ABS and LDPE. I. Melt rheological behavior

Studies are presented on melt rheological properties of binary blend of polypropylene (PP) and acrylonitrile–butadiene–styrene terpolymer (ABS), and ternary blend of PP, ABS, and low-den-sity polyethylene (LDPE). Data obtained in capillary rheometer are presented to describe the effect of blending ratio, shear stress, and shear rate on flow properties, melt viscosity, and melt elasticity. At a blend composition corresponding to 10 wt % ABS content, both binary and ternary blends show maximum in melt viscosity accompanied by minimum in melt elasticity. Pseudoplasticity of the melt decreases with increasing ABS content. In ternary blends, LDPE facilitates the flow at low LDPE contents and obstructs the flow at high LDPE contents. Scanning electron microscopic studies are also presented to illustrate the state of dispersion and its variation with blend composition.     

Studies on binary and ternary blends of polypropylene with ABS and LDPE. II. Impact and tensile properties

Studies on impact and tensile properties of binary blend of PP and ABS and ternary blend of PP, ABS, and LDPE are presented. Variation of impact strength and the fracture surface morphology with blend composition is examined and interpreted. Tensile behavior in the yield region is studied and the trends of variation of work of yield and impact strength are compared to ascertain the predominent mechanism of impact toughening in these binary and ternary blends. An analysis of yield–stress data in terms of theoretical models is presented to reveal the differences in these binary and ternary blends, attributable to the role of LDPE component in the ternary blend.     

弹性体对废旧PS/废旧ABS/HDPE/木粉复合材料性能影响

探讨了苯乙烯-丁二烯-苯乙烯共聚物热塑性弹性体(SBS)、三元乙丙橡胶(EPDM)、丁苯橡胶(SBR)3种弹性体对废旧聚苯乙烯(PS)/废旧丙烯腈-丁二烯-苯乙烯共聚物(ABS)/高密度聚乙烯(HDPE)/木粉复合材料物理及力学性能影响.结果表明,3种弹性体不但不会导致废旧PS/废旧ABS/HDPE/木粉复合材料密度的增加,而且有利于降低复合材料的吸水率,改善复合材料的冲击韧性;添加SBS的废旧PS/废旧ABS/HDPE/木粉复合材料综合性能最优,密度为0.90 g/cm3,冷、热水中的吸水率分别降至0.87％,1.32％,冲击强度增至3.1 kJ/m2.     

Measurement of the pressure dependence of viscosity of polymer melts using a back pressure‐regulated capillary rheometer

The effect of pressure on the melt viscosity was experimentally investigated for five polymers: polycarbonate (PC), acrylonitrile‐butadiene‐styrene (ABS), polystyrene (PS), polypropylene (PP), and low‐density polyethylene (LDPE). Measurements were carried out using capillary rheometer modified to allow regulation of back pressure. To enable correction for the entrance pressure drop, two round‐hole dies were used: a 1‐mm diameter die of length 10 mm and an orifice die of the same diameter. For determining the pressure coefficient from the experimental viscosity data, time‐pressure superposition was applied to generate a master curve to which the Carreau‐Yasuda model was fitted. The resulting pressure coefficients revealed that for the polymers studied the order of the degree of the pressure dependence is as follows: PS > ABS > PC > PP > LDPE. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

我国合成树脂的展望

综述了我国“八五”期间合成树脂LDPE、LLDPE、HDPE、PP、PS、ABS以及工程塑料PA、POM、PC、PET、PBT、PTFE、PSF、PPO、MPPO、PPS的发展情况,并介绍了新建合成树脂装置及其生产能力。     

The plasticating process in injection molding

A mathematical representation of the plasticating process in a reciprocating-screw injection-molding machine has been formulated as a design tool for simulating the effect of processing parameters on the melting performance, the melt temperature, and the pressure profile. Comparisons with experimental data on low density polyethylene (LDPE), acrylonitrile butadiene styrene (ABS), and polyvinyl chloride (PVC) under a wide variety of processing conditions are described.     

Effect of waste polymer addition on the rheology of modified bitumen

This paper deals with the modification of petroleum bitumen with four different types of waste polymers. EVA, EVA/LDPE blend, crumb tire rubber and ABS, all of them coming from recycling plants of waste plastic materials, were used as modifying agents of the bitumen employed in the pavement building. Optical microscopy, modulated calorimetry and a set of different rheological tests were developed in order to characterise the modified bitumens. The results obtained reveal that tire rubber as well as its blends with other polymers can be considered as an interesting modifier of the bitumen in a wide range of temperatures. As an elastomer, it endows the pavement a higher flexibility, which makes it more resistant to the traffic loading. The blend composed of EVA and LDPE displays quite promising results at high in-service temperatures, due to the development of a polymer network throughout the modified bitumen. Furthermore, the calorimetry tests carried out demonstrate different degrees of compatibility between the bitumen and the polymers used.