PC／PET／PE—g—MAM三元共混体系流动性的研究

以ＰＥ－ｇ－ＭＡＨ和ＰＥ－ｇ－ＭＡＮａ、ＰＥ－ｇ－ＭＡＺｎ马来酸盐离聚物为相容剂性组成ＰＣ－ＰＥＴ／ＰＥ－ｇ－ＭＡＭ三元共混体系。用毛细管流变仪研究了不同ＰＥ－ｇ－ＭＡＭ的接枝率及用量对共混物流动性的影响。     

LDPE接枝马来酸锌离聚物对PP／PA6共混体系相容性的影响

采用ＳＥＭ和动态粘弹谱研究了不同接枝率的ＬＤＰＥ接枝马来酸锌离聚物（ＬＤＰＥ－ｇ－ＭＡＺｎ）对ＰＰ／ＰＡ６共混体系相容性的影响。ＬＤＰＥ－ｇ－ＭＡＺｎ采用熔融法合成,所制样品接枝率分别为１．５％（质量,下同）、４．５％和５．４％。研究结果表明,ＬＤＰＥ－ｇ－ＭＡＺｎ能有效地改善ＰＰ／ＰＡ６共混物的相容性,其相容性随离聚物接枝率的提高而增强。在ＰＰ（９０）／ＰＡ（１０）体系中,加入离聚物后分散相（ＰＡ６）更均匀、粒子尺寸更小,而且随着离聚物接枝率的提高,ＰＡ６颗粒的粒径就越小,分散越匀;在ＰＰ（５０）／ＰＡ（５０）的体系中,离聚物的加入使两相互相贯穿,在动态粘弹谱上表现出Ｔｇ相互靠近,熔断温度有所提高。     

PC/PET/PE-g-MAM三元共混体系流动性的研究

以ＰＥｇＭＡＨ 和ＰＥｇＭＡＮａ 、ＰＥｇＭＡＺｎ 马来酸盐离聚物为相容剂组成ＰＣ／ＰＥＴ／ＰＥｇＭＡＭ 三元共混体系。用毛细管流变仪研究了不同ＰＥｇＭＡＭ 的接枝率及用量对共混物流动性的影响,结果表明：马来酸盐离聚物增强了ＰＣ 和ＰＥＴ 间的相容性,当其含量或接枝率较大时,可以显著降低ＰＣ／ＰＥＴ 共混物的表观粘度,提高体系的流动性,相同接枝率的ＰＥｇＭＡＮａ 对共混体系表观粘度的影响更为显著。     

PVC／TPU／SBS—g—MMA共混体系研究

制备了ＳＢＳ－ｇ－ＭＭＡ系列接枝共聚物,并对其进行了表征。以ＳＢＳ－ｇ－ＭＭＡ作为ＰＶＣ／ＴＰＵ共混体系的增容剂,对不同配比的ＰＶＣ／ＴＰＵ／ＳＢＳ－ｇ－ＭＭＡ共混体系的物理力学性能、流变性等进行了研究。结果表明,ＳＢＳ－ｇ－ＭＭＡ接枝共聚物对ＰＶＣ／ＴＰＵ共混体系起到了明显的增容作用。     

低密度聚乙烯接枝烯基双酚A醚对HDPE／PC共混体系性能的影响

本文采用烯基双酚Ａ醚接枝低密度聚乙烯（ＬＤＰＥ－ｇ－ＤＢＡＥ）作为高密度聚乙烯／聚碳酸酯（ＨＤＰＥ／ＰＣ）共混体系的增容剂,初步研究了ＬＤＰＥ－ｇ－ＤＢＡＥ对ＨＤＰＥ／ＰＣ体系性能的影响。通过对共混物形态观察、耐热性能及力学性能测试,发现ＬＤＰＥ－ｇ－ＤＢＡＥ对ＨＤＰＥ／ＰＣ体系有良好的增容效果;并发现了增容剂的最佳用量质量比大致为１０％,提高增容剂的接枝率更有利于改善共混物的性能。６５／３５ＨＤＰＥ／ＰＣ共混物的ＨＤＴ为９２℃,拉伸强度３０２ＭＰａ,冲击强度２９８ｋＪ／ｍ２,分别比未加增容剂时的８２℃,２７３ＭＰａ和１５５ｋＪ／ｍ２有较大提高。     

MAH—g—PP对PP／EVAL共混体系的增容作用

系统研究了不同组成及配比的马来酸酐接枝聚丙烯（ＭＡＨ－ｇ－ＰＰ）及其用量对聚丙烯（ＰＰ）与乙烯－乙烯醇共聚物（ＥＶＡＬ）的共混体系（ＰＰ／ＥＶＡＬ）力学性能借用Ｂｒａｂｅｎｄｅｒ塑化仪测试了ＰＰ／ＥＶＡＬ／ＭＡＨ－ｇ－ＰＰ共混体系的加工性能。结果表明,ＭＡＨ－ｇ－Ｐ接枝物对ＰＰ／ＥＶＡＬ共混体系有较好的增容作用,适量加入,可使ＰＰ／ＥＶＡＬ共混体系的力学性能明显提高,而加工性能基本不变。     

EPDM－g－MMA接枝率对POM／EPDM共混物增容作用的影响

本文介绍以ＢＰＯ为引发剂，合成接枝共聚物ＥＰＤＭ－ｇ－ＭＭＡ的方法。并对其进行红外表征，另外，借助ＳＥＭ和力学性能测试研究了接枝率对ＰＯＷ／ＥＰＤＭ共混物的增容作用的影响。     

EPDM—g—MMA接枝率对POM／EPDM共混物增容作用的影响

本文介绍以ＢＰＯ为引发剂，合成接枝共聚物ＥＰＤＭ－ｇ－ＭＭＡ的方法，并对其进行红外表征，另外，借助ＳＥＭ和力学性能测试研究了接枝率时ＰＯＭ／ＥＰＤＭ共混物的增容作用的影响。     

PE—g—MAH对HDPE／PA6共混合金的增容作用

利用ＤＳＣ研究了ＰＥ－ｇ－ＭＡＨ对ＨＤＰＥ／ＰＡ６共混体系的增容作用,并讨论了ＰＥ－ｇ－ＭＡＨ对ＨＤＰＥ／ＰＡ６共混物的混容性能和力学性能的影响。结果表明：ＰＥ－ｇ－ＭＡＨ能有效地增强ＨＤＰＥ／ＰＡ６共混体系两相界面的相互作用,改善ＨＤＰＥ和ＰＡ６的相容性,是效果较好的增容剂。适量的ＰＥ－ｇ－ＭＡＨ的加入可使ＨＤＰＥ／ＰＡ６共混合金的可混性能提高,并有一定的增强作用。     

HDPE／PC共混体系的增容剂分子设计与合成

介绍了高密度聚乙烯（ＨＤＰＥ）／聚碳酸酯（ＰＣ）共混体系的增容剂的分子设计与合成技术。采用了低密度聚乙烯（ＬＤＰＥ）在引发剂过氧化苯甲酰（ＢＰＯ）存在下与二烯丙烯双酚Ａ（ＤＡＢＰＡ）在二甲苯中进行溶液接枝共聚反应的工艺。通过重量法和Ｘ－射线光电子能谱（ＸＰＳ）证实了接枝共聚物（ＬＤＰＥ－ｇ－ＤＡＢＰＡ）的存在。研究了引发剂ＢＰＯ用量、单体ＤＡＢＰＡ用量、反应时间及反应温度对接枝率的影响,确定了合成     

Studies on polycarbonate/polystyrene/polycarbonate- graft-polystyrene blends. II. Compatibility and morphology of PC/PS/PC-g-PS blends

A radiation grafted copolymer of polycarbonate (PC) and polystyrene (PS) was used as a compatibilizer of PC/PS melt blends. The compatibility and morphology of PC/PS/PC-g-PS blends were studied by differential scanning calorimetry and scanning electron microscopy. As a consequence of the addition of PC-g-PS, the compatibility of PC/PS blends was improved; the dimensions of the dispersed phases and the interfacial tension between the two phases were reduced. Additionally, stabilization against gross segregation and interfacial adhesion of the blends were also improved by adding PC-g-PS as a compatibilizer. © 1998 SCI.     

Polycarbonate blends with polystyrene and polypropylene

Blends of polycarbonate/polystyrene (PC/PS), polycarbonate/polypropylene (PC/PP) and ternary blends of the three components (PC/PS/PP) were studied. Extrudate swell of the molten blends increased with increasing concentrations of the minor components and leveled off at characteristic blend compositions. These compositions corresponded to the limits of compatibility as judged by the onset of brittleness in tensile tests. Both PS and PP appear to have some limited practical compatibility with PC. The change in extrudate swell behavior with concentration may be a rapid and convenient test for the effective concentration limits of partially miscible polymers.     

SBS-g-MAH的合成表征及其对PC/PS共混体系相容性的影响

用溶液法合成SBS-g-MAH。试验结果表明,随反应温度升高、MAH投入量增加、反应时间增长及BPO用量加大,MAH的接枝率增大。并用IR、NMR对接枝物进行表征。将SBS-g-MAH加到PC/PS共混体系中,PS相的Tg升高,PC相的Tg下降,二者相容性提高。     

Thermal behavior,morphology, and the determination of the Flory–Huggins interaction parameter of polycarbonate–polystyrene blends

Blends of bisphenol-A polycarbonate (PC) and polystyrene (PS) prepared by screw extrusion and solution casting have been investigated with weight fractions of PC in the blends varying from 0.95 to 0.05. From the measured glass transition temperatures (T_g) and specific heat increments (ΔC_p) at the T_g, the polystyrene appears to dissolve more in the PC phase than does the PC in the PS phase. The blend appears to be near eqilibrium under extrusion conditions so that the polymer–polymer interaction parameter of PC/PS blends was calculated and found to be 0.038±0.004 for extruded blends at 250°C. Scanning electron microscopy supports the conclusion that the compatibility increases more in the region of PS-rich compositions than in the regions of PC-rich compositions of the PC/PS blends.     

Effect of different types of organoclays and compatibilizers on the properties of polystyrene‐based nanocomposites

Polystyrene/organoclay nanocomposites were prepared by melt intercalation in the presence of elastomeric impact modifiers. Three different types of organically modified montmorillonites; Cloisite® 30B, 15A, and 25A, were used as reinforcement, whereas poly [styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] (SEBS‐g‐MA) and poly(ethylene‐b‐butyl acrylate‐b‐glycidyl methacrylate) (E‐BA‐GMA) elastomeric materials were introduced to act as impact modifier. Owing to its single aliphatic tail on its modifier and absence of hydroxyl groups, Cloisite® 25A displayed the best dispersion in the polystyrene matrix, and mostly delaminated silicate layers were obtained in the presence of SEBS‐g‐MA. This was attributed to the higher viscosity of SEBS‐g‐MA compared with both E‐BA‐GMA and poly(styrene‐co‐vinyloxazolin) (PS). In addition, the compatibility between SEBS‐g‐MA and PS was found to be better in comparison to the compatibility between E‐BA‐GMA and PS owing to the soluble part of SEBS‐g‐MA in PS. The clay particles were observed to be located mostly in the dispersed phase leading to larger elastomeric domains compared with binary PS/elastomer blends. The enlargement of the elastomeric domains resulted in higher impact strength values in the presence of organoclay. Good dispersion of Cloisite® 25A in PS/SEBS‐g‐MA blends enhanced the tensile properties of this nanocomposite produced. It was observed that the change in the strength and stiffness of the ternary nanocomposites mostly depend on the type of the elastomeric material. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Relationship between structure and properties in high‐performance PA6/SEBS‐g‐MA/(PPO/PS) blends: The role of PPO and PS

This work aimed at studying the role of poly(phenylene oxide) (PPO) and polystyrene (PS) in toughening polyamide‐6 (PA6)/styrene‐ethylene‐butadiene‐styrene block copolymer grafted with maleic anhydride (SEBS‐g‐MA) blends. The effects of weight ratio and content of PPO/PS on the morphology and mechanical behaviors of PA6/SEBS‐g‐MA/(PPO/PS) blends were studied by scanning electron microscope and mechanical tests. Driving by the interfacial tension and the spreading coefficient, the “core–shell” particles formed by PPO/PS (core) and SEBS‐g‐MA (shell) played the key role in toughening the PA6 blends. As PS improved the distribution of the “core–shell” particles due to its low viscosity, and PPO guaranteed the entanglement density of the PPO/PS phase, the 3/1 weight ratio of PPO/PS supplied the blends optimal mechanical properties. Within certain range, the increased content of PPO/PS could supply more efficient toughening particles and bring better mechanical properties. Thus, by adjusting the weight ratio and content of PPO and PS, the PA6/SEBS‐g‐MA/(PPO/PS) blends with excellent impact strength, high tensile strength, and good heat deflection temperature were obtained. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45281.     

PE接枝马来酸酐对PC/PBT共混体系性能的影响

采用DSC方法测试了PC/PBT( 70 / 3 0 ,质量分数 )共混体系和在体系中加入PE接枝马来酸酐共混物的玻璃化温度 ,研究了PE接枝马来酸酐对PC/PBT共混体系性能的影响。结果表明 :PE接枝马来酸酐的加入改善了PC/PBT共混体系两相间的相容性 ,而且还起到增韧作用 ,使得共混体系的冲击性能有着明显的提高     

烯基双酚A醚接枝LDPE对HDPE／PC相容性和结晶速率的影响

本文通过热力学曲线,对HDPE/PC体系中HDPE的熔融温度(T_m)和PC的玻璃化转变温度(T_g)的测试,考察了增容剂烯基双酚A醚接枝LDPE(LDPE-g-DBAE)对共混体系相容性的影响,同时还研究了体系中HDPE的结晶速率。     

The effect of UV‐irradiation and molten medium on the mechanical and thermal properties of polystyrene–polycarbonate blends

Polymer materials with improved properties can be obtained through polymer blends. As a polymer mixture is generally immiscible and incompatible, it is necessary to develop new methods to improve the interfacial adhesion. The aim of this work is to find formulations and associated processes to upgrade engineering polystyrene (PS) and polycarbonate (PC) polymer blends with the objective of using the best “process‐formulation” couple. In this study, blends of PS/PC were prepared in molten medium using reactive extrusion after UV‐irradiation. The effects of UV‐irradiation on some properties of blends under molten medium were investigated by differential scanning calorimetry (DSC), fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The data showed that the presence of polycarbonate in the blend increased the tensile strength and elongation at break with respect to pure PS. The mechanical properties of the blends were improved after irradiation. All irradiated blends are thermally more stable than those nonirradiated. Chemical changes can be clearly seen in FTIR spectra through two bands assigned to C?O and OH groups. The mutual influence between the PS/PC polymer blends compositions during UV‐irradiation was studied. PS and PC have different photo‐mechanisms due to the larger UV absorption of polystyrene and formation of more stable tertiary carbon radicals. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Ultrasonic improvement of the compatibility and rheological behavior of high‐density polyethylene/polystyrene blends

The effects of ultrasonic oscillations on the rheological behavior, mechanical properties, and morphology of high‐density polyethylene (HDPE)/polystyrene (PS) blends were studied. The experimental results show that the die pressure and apparent viscosity of HDPE/PS blends are remarkably reduced in the presence of ultrasonic oscillations and that mechanical properties of the blends are improved. The particle size of the dispersed phase in HDPE/PS blends becomes smaller, its distribution becomes narrower, and the interfacial interaction of the blends becomes stronger if the blends are extruded in the presence of ultrasonic oscillations. Ultraviolet spectra and Soxhlet extraction results show the formation of a polyethylene‐PS copolymer during extrusion in the presence of ultrasonic oscillations, which improves the compatibility of HDPE/PS blends. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 23–32, 2002