乙烯-丙烯酸酯-甲基丙烯酸缩水甘油酯三元共聚物对PC/PBT共混体系性能的影响

采用DSC方法测试了PC/PBT(70/30,质量份)共混体系及在体系中加入乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯共聚物(AX8900)共混物的玻璃化温度,研究了AX8900对PC/PBT共混体系性能的影响.结果表明:AX8900改善了PC/PBT共混体系两相间的相容性,而且极大地提高了PC/PBT共混体系的冲击强度和断裂伸长率,AX8900用量为1 phr时,共混体系的综合性能较好.     

环氧化EPDM对PBT/LLDPE共混体系的微观形态及力学性能的影响研究

采用反应性熔融共混技术制备了聚对苯二甲酸丁二醇酯(PBT)/线型低密度聚乙烯(LLDPE)共混物,并采用环氧化三元乙丙橡胶(eEPDM)为增容剂改善PBT/LLDPE共混体系的相容性。使用红外光谱(FTIR)和扫描电子显微镜(SEM)等手段对共混物进行了分析和相形态观察,并测试了力学性能,研究了eEPDM对PBT/LLDPE共混体系形态结构和力学性能的影响。研究结果表明,熔融共混过程中eEPDM的环氧基团与PBT的端羧基发生化学反应,就地生成PBT-g-EPDM共聚物,该共聚物可对PBT/LLDPE共混物起到良好的增容作用。与PBT/LLDPE/EPDM共混体系相比,PBT/LLDPE/eEPDM共混物的相区尺寸更小,分布更窄,而且加入eEPDM在改善冲击强度方面比添加EPDM更有效。     

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     

PTT/PBT共混体系及可纺性探究

研究了PTT/PBT共混体系的相容性和结晶性能,并对体系的可纺性作了初步探究。结果表明:PTT/PBT共混体系在无定形区具有较好的相容性,但在晶区是晶相分离的。在冷结晶过程中,当PBT含量超过20%时,将促进体系的结晶性能;而在熔融结晶过程中,第二组分的加入抑制了体系的结晶性能,当配比为50/50时,结晶速率相对最低。另外,PTT/PBT共混体系表现出了良好的可纺性,共混纤维的断裂伸长率随着拉伸倍数和体系中PBT含量的增大而减小,强度增大,但稍差于纯组分纤维;当PTT含量达到50%后,共混纤维表现出了明显优于纯PBT纤维的回弹性,而当PTT含量达到70%时,共混纤维的回弹性能已接近纯PTT纤维。     

增容剂对PBT/PP共混物结构性能的影响

以乙烯/乙酸乙烯酯共聚物接枝马来酸酐(EVA-g-MAH)、乙烯/辛烯共聚物接枝马来酸酐(POE-g-MAH)为增容剂,采用熔融共混法制备了不同组成比例的PBT/PP共混物,通过DSC、TG、XRD、SEM等多种手段测试了共混物的性能,详细研究PBT/PP质量比、增容剂种类和用量对共混物结构性能的影响。结果表明:PBT/PP的质量比为70/30时,所得共混物的微观形貌最好;加入2种增容剂增容后发现,EVA-g-MAH对PBT/PP共混物相容性的改善效果比POE-g-MAH的增容效果好,并且PBT/PP/EVA-g-MAH的质量比为70/30/3时共混体系相容性最好。     

相容剂对PBT／PC共混体系性能的改进

用DSC方法测试了PBT/PC（50/50,质量份）及经过相容剂（为PS接枝橡胶）处理的共混物,研究了相容剂用量对共混体系力学性能的影响。结果表明：相容剂的加入可使共混物中PBT的特点、熔融焓、结晶温度都分别比纯PBT有所降低,熔体流动速率和热变形温度有所下降。采用相容剂提高了PBT/PC共混体系两相间的相容性,改善了PBT的冲击性能,相容剂用量为15质量份时冲击强度达到最大值。     

PET/PBT共混体系的相容性及结晶行为研究

利用 DSC和光学解偏振仪对不同配比的 PET/PBT共混体系的相容性及结晶行为进行了研究。结果表明 ,PET/PBT共混体系在非晶区是相容的 ,在晶区是相分离的 ;PBT的加入 ,对共混体系的结晶性能有显著提高 ,但由于酯交换反应的存在 ,使得共混体系的结晶性能表现出一定程度的不稳定性。     

PBT(聚对苯二甲酸丁二酯)共混纤维的结构与性能——(Ⅰ)微观结构及力学性能的研究

本文应用SEM、S—S曲线、DSC、WAXS以及密度梯度等测试技术,对PBT(聚对苯二甲酸丁二酯)、分别与PET(聚对苯二甲酸乙二酯)、PP(聚丙烯)和PA6(聚己内酰胺)共混熔纺成纤后的微观形态和力学性能进行了测试和分析。SEM研究表明,PBT/PET=50/50和PBT/PA6=10/90时,其各自的PET相和PBT相就已分别在PBT基体和PA6基体中形成了原纤结构。PBT/PET共混物在整个共混组分比例范围内具有好的相容性;PBT/PA6属部分相容体系;PBT/PP属不相容体系。对于获得综合物性指标均有所改善的PBT/PA6共混纤维,PBT/PA6=10/90是一比较合适的量。     

PC／PBT共混物的流变行为研究

考察了聚碳酸酯/聚对苯二甲酸丁二醇酯(PC/PBT)共混物的流变行为。研究发现:PBT的加入,可使共混体系的粘流活化能增大,流动性增加;在PC/PBT共混物中加入EVA可进一步增加PC与PBT的相容性,并提高其流动性能。     

磷酸化合物对PBT/PC共混物性能的影响

将聚磷酸铵(APP)、焦磷酸钠(SPP)及磷酸三苯酯(TPP)作为酯交换反应抑制剂,分别与聚对苯二甲酸丁二醇酯(PBT)/聚碳酸酯(PC)进行熔融共混,并对不同共混体系的性能进行了研究。DSC用于研究抑制剂与PBT/PC共混体系共混物的结晶行为变化。结果表明,延长共混时间,酯交换反应程度提高,PBT结晶能力减弱,结晶温度降低,三种磷酸化合物对PBT/PC共混物的酯交换反应都能起到抑制作用;DMA用于研究了共混物的相容性,结果表明,抑制剂加入导致PBT与PC发生相分离;红外光谱用于研究共混物基团的特征吸收峰变化情况,结果证明,抑制剂不能完全阻止酯交换的发生;冲击试验机用来测试共混物的冲击强度的变化,结果发现,纯PBT/PC的冲击强度为24 J/m,含有抑制剂的共混物的冲击强度提高,加入TPP后的共混体系缺口冲击强度达到130 J/m左右。     

Blends of thermoplastic polyesters with amorphous polyamide. I. Thermal and crystallization behavior

The thermal and crystallization behavior of blends of three thermoplastic polyesters with different degrees of crystallizability, with an amorphous aromatic polyamide is reported. The thermoplastic polyesters used in the investigation were poly(butylene terephthalate) (PBT), poly(ethylene terephthalate) (PET) and a co-polyester of 1,4 cyclohexane-dimethanol, ethylene glydol and terephthalic acid (PETG). The blends exhibited a single glass transition temperature indicating mlseibility in the amorphous phase. The results of thermal analysis indicated that the crystallization of all the three polyesters is facilitated in the molten phase as a result of blending. The blending significantly Increased the degree of crystallinity of PET, but there was no change in the crystallinity of PBT. It is thus observed that the extent of change in both the crystallization rate and the degree of crystallinity of polyesters depend on the inherent crystallizability of the individual polyester.     

Polyester resin as a compatibilizing agent for some polymeric blends

Dielectric and viscosity techniques were used to determine the degree of the compatibility of poly(methyl methacrylate)/polycarbonate, poly(methyl methacrylate)/ polystyrene, and polycarbonate/polystyrene blends in different ratios (25/75, 50/50, and 75/25 w/w). The effect of the addition of 5, 10, and 20% concentrations of the prepared polyester resin [poly(butylene terephthalate adipate)] on the compatibility of these blends was studied. The dielectric properties were measured over a frequency range (from 100 Hz to 100 kHz) at various temperatures covering the glass‐transition temperatures of the polymers used (from 30 to 170°C). It was found from the dielectric and viscosity measurements that the addition of 10% polyester to poly(methyl methacrylate)/polycarbonate, 20% polyester to poly(methyl methacrylate)/polystyrene, and 5% polyester to polycarbonate/polystyrene blends enhanced the degree of compatibility of such blends. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Partially Bio-Based Polyester Bead Foams via Extrusion Foaming of Poly(butylene terephthalate)/Poly(butylene furanoate) Blends

The interest in bio-based alternatives to classical polyesters such as poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) is steadily growing to achieve a more sustainable approach to polymer materials. In this study, PBT/poly(butylene furanoate) (PBF) blends are prepared, characterized and extrusion foamed. PBF as a bio-based polyester offers two advantages. The ecological footprint of the material is reduced, and additionally, it can be used in Diels-Alder reactions at the blend surface to support fusion of the foamed beads. The blending behavior of the polyesters is investigated using samples prepared in a microcompounder, particularly focused on the miscibility of the blends and transesterification reactions. The blends are thermodynamically immiscible but show a certain degree of transesterification according to nuclear magnetic resonance (NMR) spectroscopy. The morphology of blend beads produced by an extrusion foaming process is analyzed regarding their cell density, cell size distribution, and open-cell content. It is shown that PBF has a positive effect on the bead foam morphology. The use of a bifunctional linker designed for chemical fusion of the bead surfaces allows to obtaining of molded parts, in contrast to beads containing pure PBT.     

Rheological behavior of polyester blend and mechanical properties of the polypropylene–polyester blend fibers

The article deals with method of preparation, rheological properties, phase structure, and morphology of binary blend of poly(ethylene terephthalate) (PET)/poly(butylene terephthalate) (PBT) and ternary blends of polypropylene (PP)/(PET/PBT). The ternary blend of PET/PBT (PES) containing 30 wt % of PP is used as a final polymer additive (FPA) for blending with PP and subsequent spinning. In addition commercial montane (polyester) wax Licowax E (LiE) was used as a compatibilizer for spinning process enhancement. The PP/PES blend fibers containing 8 wt % of polyester as dispersed phase were prepared in a two‐step procedure: preparation of FPA using laboratory twin‐screw extruder and spinning of the PP/PES blend fibers after blending PP and FPA, using a laboratory spinning equipment. DSC analysis was used for investigation of the phase structure of the PES components and selected blends. Finally, the mechanical properties of the blend fibers were analyzed. It has been found that viscosity of the PET/PBT blends is strongly influenced by the presence of the major component. In addition, the major component suppresses crystallinity of the minor component phase up to a concentration of 30 wt %. PBT as major component in dispersed PES phase increases viscosity of the PET/PBT blend melts and increases the tensile strength of the PP/PES blend fibers. The impact of the compatibilizer on the uniformity of phase dispersion of PP/PES blend fibers was demonstrated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4222–4227, 2006     

The vibration welding of poly(butylene terephthalate) and a polycarbonate/poly(butylene terephthalate) blend to each other and to other resins and blends

Vibration welding is used to assess the weldability of poly(butylene terephthalate) (PBT) and a polycarbonate/poly(butylene terephthalate) blend (PC/PBT) to each other and to other resins and blends: PBT to PC/PBT, PBT to modified poly(phenylene oxide) (M-PPO), PBT to polyetherimide (PEI) and PEI to a 65 wt% mineral-filled polyester blend (65-PF-PEB), PBT to a poly(phenylene oxide)/polyamide blend (PPO/PA), PC/PBT to M-PPO, and PC/PBT to PPO/PA. Based on the tensile strength of the weaker of the two materials in each pair, the following relative weld strengths have been demonstrated: PBT to PC/PBT,98%; PBT to PEI, 95%; 65-PF-PEB to PEI, 92%; and PC/PBT to M-PPO, 73%. PBT neither welds to M-PPO nor to PPO/PA, and PC/PBT does not weld to PPO/PA.     

PLA/PBAT/OMMT纳米复合材料的制备及其结构与性能研究

通过转矩流变仪将聚乳酸（PLA）、聚己二酸对苯二甲酸丁二酯（PBAT）、有机蒙脱土（OMMT）和扩链剂（ADR）熔融共混制备了PLA/PBAT/OMMT三元纳米复合材料。通过差示扫描量热仪、偏光显微镜、扫描电子显微镜、旋转流变仪和傅里叶红外光谱仪对复合材料的结晶性能、熔融行为、相态结构、流变性能等进行了分析。结果表明,PBAT和OMMT的加入提高了PLA的结晶速率和晶核密度; ADR的加入提高了PLA与PBAT的相容性;随着ADR的加入,PLA/PBAT/OMMT复合材料的储能模量提高,体系的熔体弹性增加。     

Isothermal and non‐isothermal crystallization of poly(L‐lactic acid)/poly(butylene terephthalate) blends

Isothermal and non‐isothermal crystallization kinetics of poly(l ‐lactic acid)/poly(butylene terephthalate) (PLLA/PBT) blends containing PLLA as major component is detailed in this contribution. PLLA and PBT are not miscible, but compatibility of the polymer pair is ensured by interactions between the functional groups of the two polyesters, established upon melt mixing. Crystal polymorphism of the two polyesters is not influenced by blending, as probed by wide‐angle X‐ray analysis. The addition of PLLA does not affect the temperature range of crystallization kinetics of PBT, nor the crystallinity level attained when the blends are cooled from the melt at constant rate. Conversely, PBT favors crystallization of the biodegradable polyester. The addition of PBT results in an anticipated onset of crystallization of PLLA during cooling at a fixed rate, with a sizeable enhancement of the crystal fraction. Isothermal crystallization analysis confirmed the faster crystallization rate of PLLA in the presence of PBT. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40372.     

热塑性树脂共混改性PBT的研究进展

综述了近年来国内外用热塑性树脂共混改性PBT的各种方法,并指出与热塑性树脂共混是今后实现PBT高性能化的主要方向之一.     

Extruded co-continuous polyester-polyalkene-carbon black composites: Influence of polyester glass transition on electrical properties

Abstract

Co-continuous extruded polyester-carbon black filled polyalkene blends exhibit a slightly positive temperature coefficient, which depends on the nature of the polyester. From studies on various polyesters (poly(butylene terephthalate), poly(ethylene terephthalate), and some of their blends), it appears that the positive temperature coefficient becomes higher when the blends are heated above the glass transition temperature of the polyester. Polyalkene melting induces a hysteresis effect between heating and cooling steps. Attempts to catalyse grafting through enhanced transesterification also promote polyester degradation and alter the morphologies of the blends.     

Partial miscibility of poly(butylene terephthalate)/BPA polycarbonate melt blends

Summary Differential scanning calorimetry (DSC) measurements have been carried out on a number of poly(butylene terephthalate) (PBT)/BPA polycarbonate (PC) blends prepared by melt compounding and solution casting from hexafluoroisopropanol (HFIP). The results clearly indicate that appreciable mixing of the two polymers takes place in the melt phase whereas complete separation is observed in cast films. The failure of the casting procedure to mimic the melt blending results is related in part to liquid-liquid phase separation and to crystallization of both polymers from the casting solvent.