超韧PBT/PC共混物的研制

研究了3种增韧剂SWR-6B、AX8900和EXL-2691A对PBT/PC(80/20)共混物力学性能和耐热性的影响,并用扫描电子显微镜对PBT/PC共混物的微观形态结构进行了分析。结果表明,随着增韧剂用量的增加,PBT/PC共混物的缺口冲击强度不断提高,当3种增韧剂各自的用量增加到20份时,PBT/PC共混物的缺口冲击强度均达到600 J/m以上,约为未加入增韧剂时的10倍;当增韧剂的用量增加到30份时,PBT/PC共混物的缺口冲击强度达到900 J/m以上,同时共混物的拉伸强度和弯曲强度降低,而维卡软化温度仍高于200℃。     

新型增韧剂增韧PC/PBT合金的研究

研究了3种增韧剂PTW、AX8900、FT862对PC/PBT合金力学性能和结晶性能的影响,并对PC/PBT合金的微观形态结构进行了分析.研究表明:增韧剂的加人,改善了两相间的相容性,提高了PC/PBT(30/70)合金的缺口冲击强度;当其质量分数达到15%时,合金材料发生脆韧转变,此时合金的缺口冲击强度为纯PC/PBT的10倍多;3种增韧剂中的甲基丙烯酸缩水甘油(GMA)含量越高,其增韧效果越好.     

增韧剂对PC/PBT合金性能的影响

研究了三种不同类型增韧剂乙烯–丙烯酸丁酯–甲基丙烯酸缩水甘油酯共聚物(PTW)、甲基丙烯酸甲酯–丁二烯–苯乙烯共聚物(MBS)和乙烯–辛烯共聚物(POE)对聚碳酸酯/聚对苯二甲酸丁二酯(PC/PBT)合金力学性能、熔体流动速率(MFR)、热性能和结晶与熔融行为的影响。结果表明:对于PC/PBT (质量比为65/35)合金,当增韧剂添加量为5份时,PC/PBT合金综合性能最优。三种类型的增韧剂都能显著改善PC/PBT合金的冲击性能,当增韧剂添加量在2～5份时,PC/PBT合金发生脆韧转变。MBS增韧PC/PBT合金的拉伸强度和弯曲强度保持率最高,分别为94.0%和92.6%,但热变形温度降低到105.7℃;PTW增韧PC/PBT合金的拉伸强度和弯曲强度保持率最低,分别为84.3%和80.7%,其优势是对热变形温度基本无影响,但对PC/PBT合金MFR的降低最严重;PTW和POE增韧PC/PBT合金的耐湿热老化性远优于MBS增韧PC/PBT合金。三种类型的增韧剂对PC/PBT合金中的PBT相结晶性均有不同程度的阻碍作用,MBS增韧PC/PBT合金的结晶度最高,为35.73%,POE增韧PC/PBT合金的结晶度为30.21%,PTW增韧PC/PBT合金的结晶度最低,为24.95%。     

新型增容剂增容PC/PBT的研制及应用

研究了丙烯酸酯与羧基双官能化的乙烯类弹性体(RC)对聚碳酸酯(PC)/聚对苯二甲酸丁二酯(PBT)(质量比为80:20)共混体系相容性和力学性能的影响,比较了RC与其它增容剂的增容效果.结果表明,RC的加入改善了PC/PBT两相间的相容性;当RC的用量为5份时,PC/PBT的缺口冲击强度达到76.3 kJ/m2,为纯PC/PBT的8.3倍:用RC增容PC/PBT制备的汽车门把手质量良好,已得到客户认可,该材料还可用于其它要求冲击强度高和耐腐蚀的汽车内外饰件.     

组分对PC/PBT/GF三元复合材料的影响

通过双螺杆挤出机制备了聚碳酸酯(PC)/聚对苯二甲酸丁二酯(PBT)/玻璃纤维(GF)三元复合材料,研究了PC,PBT,GF以及增容剂的含量对复合材料的影响。结果表明,在PC/PBT体系中,当PC∶PBT=7∶3时复合材料可以达到较好的刚韧平衡,拉伸强度为71.6 MPa,缺口冲击强度为10.21 kJ/m~2;在PC/PBT/GF复合材料中GF可以起到异相成核的作用,提高了复合材料的结晶速度,随着GF含量的增加,弯曲强度逐渐增加,拉伸强度先上升后下降,缺口冲击强度先下降后上升;增容剂KH–550,AX8900以及PTW均能改善PC/PBT/GF三元复合材料的相容性,其中AX8900增容效果最佳,从力学性能表明,加入1%的AX8900,PC/PBT/GF复合材料的性能最平衡,弯曲弹性模量和缺口冲击强度分别是没有添加增容剂的1.13倍和2.11倍。     

阻燃PBT/ABS合金增韧改性的研究

利用双螺杆挤出机制备了阻燃PBT/ABS系列合金,探讨了甲基丙烯酸甲酯/丁二烯/苯乙烯共聚物(MBS)和乙烯/丙烯酸甲酯/甲基丙烯酸缩水甘油酯无规三元共聚物(EMA-GMA)对阻燃PBT/ABS合金的增韧和增容作用,采用力学测试方法、差示扫描量热分析仪(DSC)和扫描电子显微镜(SEM)研究了MBS和EMA-GMA对阻燃PBT/ABS合金的力学性能和相容性的影响。结果表明:在阻燃PBT/ABS合金(80/20)体系中,加入6%MBS,合金的的缺口冲击强度为9.8 kJ/m2,是没加MBS时的1.5倍左右,而EMA-GMA与MBS复合后,具有一定的协同效应,当EMA-GMA、MBS质量分数分别为4%、4%时,合金的拉伸强度为36.5 MPa,1.6 mm阻燃等级为V-0,缺口冲击强度达到13.5 kJ/m2。     

新型增容剂对 PC/PBT合金性能的影响

研究了新型增容剂丙烯酯与缩水甘油酯双官能化的乙烯类弹性体(KY-6B)对PC/PBT合金的性能及结构的影响.结果表明,随着KY-6B含量的增加,C/PBT合金的拉伸强度、弯曲强度及弯曲模量逐渐下降,而缺口冲击强度、断裂伸长率逐渐上升,非缺口冲击强度变化不大.PC/PBT合金的上述性能当KY-6B含量超过8%时变化不明显.IR图谱显示,Y-6B的存在使PC与PBT的C=O吸收峰更靠近.DsC测试结果表明,Y-6B可使PC/PBT合金中PC与PBT两者的Tg之差减小,BT的熔点、熔融烩、结晶温度有所降低.SEM图谱显示,随KY-6B含量增加,PC/PBT合金的冲击断面逐渐变得粗糙、孔洞化和银纹丝状连接增多.上述测试结果都表明KY-6B是PC/PBT合金的优良增容剂和冲击改性剂.     

PA610/PC合金的制备及其力学性能研究

分别选用环氧树脂(EP)及(乙烯/马来酸酐/甲基丙烯酸缩水甘油酯)三元共聚物(EMG)为增容剂,采用熔融挤出法制备了PA610/PC/EP合金和PA610/PC/EMG合金,并研究了这两种合金的力学性能。结果表明,在保持合金其它力学性能基本不变的情况下,当PA610/PC/EP的质量比为75/25/2时,合金的缺口冲击强度比未加入EP时提高了83.7%,比纯PA610提高了84.1%;而且在PA610/PC(75/25)体系中加入EMG增容时,合金的缺口冲击强度也随其含量的增加而明显提高;在加入9份EMC的PA610/PC/EMG体系中再加入2份EP协同增容时,合金的缺口冲击强度比未增容时提高了142.0%。     

ABS回收料/PBT合金的增容改性

以丙烯腈–丁二烯–苯乙烯塑料回收料(rABS)为基体,将其与聚对苯二甲酸丁二酯(PBT)共混,制备了rABS/PBT合金,并以自制的甲基丙烯酸缩水甘油酯(GMA)接枝rABS(rABS-g-GMA)为相容剂,研究了PBT及rABS-gGMA对rABS/PBT合金力学性能和相态结构的影响。结果表明,PBT的加入提高了rABS的强度,但降低了韧性;随着rABS-g-GMA用量的增加,合金的拉伸和弯曲强度没有明显变化,但断裂伸长率和缺口冲击强度明显提升,当rABS/PBT质量比为70/30,rABS-g-GMA用量为15份时,合金的断裂伸长率和缺口冲击强度分别较未加相容剂的提高了147%和51.6%。rABS-g-GMA的加入提高了合金的损耗与储能模量以及损耗因子峰值,阻碍了合金中PBT的结晶,生成了更多的无定形区,促使PBT分散粒子尺寸减小,分布均匀,明显改善了rABS和PBT间的相容性。     

新型增韧剂对PBT/PC合金增韧的研究

以双烯烃、苯乙烯、甲基丙烯酸甲酯为单体,采用种子聚合技术,合成了具有核-壳结构的接枝共聚物(MIS树脂),并与PBT/PC合金共混.结果表明,MIS树脂为15～18份时,PBT/PC合金的冲击强度最大.加入MIS树脂后,PBT/PC合金的断层明星,而且出现了很多小空洞,提高了PBT/PC合金的力学性能.MIS树脂可以用...     

PC/PBT合金增韧改性的研究

研究了“核-壳”结构的丙烯酸酯类(ACR)抗冲改性剂对PC／PBT(80／20)合金力学性能和耐热性的影响；并用扫描电子显微镜对共混物的微观形态结构进行了分析。结果表明：随ACR抗冲改性剂的增加，共混物的冲击强度先增后降，当ACR的用量为15份时，出现最大值；同时共混物的拉伸强度和维卡软化温度都降低。     

Toughening of poly(butylene terephthalate) by AES terpolymer

AES, a terpolymer of acrylonitrile-EPDM(ethylene/propylene/diene elastomer)-styrene, was blended in poly(butylene terephthalate) (PBT). Uniaxial tensile tests were carried out at various strain rates on blends containing 0-50 wt% of AES in order to study the yielding behavior of PBT in these blends by the Eyring equation. It was found that stress concentration factor (γ) increases sharply when a small content of AES is incorporated in the PBT matrix, but further incorporation seems to have small effect and γ levels out, a behavior that can be explained by the blend morphology and AES mechanical characteristics. The effect of AES content on the notched Izod impact strength of PBT blends was also examined in depth. It was found that a supertough blend can be achieved with at least 30 wt% of AES in PBT in appropriate molding temperature. Macroscopic and microscopic observations indicate that dilatational process play an important role on the toughening mechanism in PBT/AES blends at notched Izod impact tests.     

强韧化PBT/PC共混物的制备与性能

采用自制的甲基丙烯酸缩水甘油酯熔融接枝丙烯腈丁二烯苯乙烯三元聚合物\[ABS-g-(GMA-co-St),AGS]为改性剂,对聚对苯二甲酸丁二醇酯（PBT）/聚碳酸酯(PC)（80/20）共混物进行改性研究。通过扫描电子显微镜、差示扫描量热仪、力学性能和流变性能测试研究了改性后共混物的性能。结果表明,随着AGS含量的增加,共混物中两相间的界面黏结增强; AGS对PBT/PC共混物具有强韧化的作用,与未添加AGS的PBT/PC共混物相比,当AGS含量为10份时,共混物的缺口冲击强度和拉伸强度分别提高了49.8 %和17.4 %;AGS的加入提高了共混物的界面强度和相容性;添加AGS能够提高共混物的结晶峰温度,起到促进晶粒生长的作用。     

PBT/官能化聚烯烃弹性体共混体系的力学性能与相形态

考察了马来酸酐接枝乙烯-辛烯共聚物（POE-g-MAH）和乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯三元共聚物（E-MA-GMA）对聚对苯二甲酸丁二醇酯（PBT）的增韧作用。结果表明，未接枝的POE弹性体对PBT缺口冲击韧性的改善作用不大。两种官能化聚烯烃弹性体（E-MA-GMA、POE-g-MAH）对PBT具有显著的增韧作用。当弹性体用量分别达到8．5％和10％以后，共混物都各自出现明显的脆／韧转变现象。这意味着在达到同样的冲击韧性时，PBT／E—MA—GMA共混体系的拉伸强度损失较小。SEM显示，PBT／E—MA—GMA共混体系中分散相具有更细微的分散，有效地诱导PBT基体产生银纹和剪切屈服，消耗大量的冲击能。     

马来酸酐接枝三元乙丙橡胶共聚物增容AES/PC共混物的研究

研究了马来酸酐接枝三元乙丙橡胶共聚物（EPDM-g-MAH）作为增容剂对丙烯腈三元乙丙橡胶苯乙烯共聚物/聚碳酸酯（AES/PC）（70/30）共混物结构和性能的影响。结果表明,EPDM-g-MAH作为反应型增容剂,能有效地减小低橡胶含量的AES/PC共混物中PC分散相的粒径,提高共混物的力学性能;当EPDM-g-MAH用量为3份时,橡胶含量为21 %的AES/PC共混物的缺口冲击强度提高近1倍,同时能保持较高的拉伸强度和热变形温度。     

Influence of high density polyethylene‐g‐maleic anhydride on compatibility and properties of poly(butylene terephthalate)/high density polyethylene blends

Poly(butylene terephthalate)/high density polyethylene (PBT/HDPE) blends and PBT/HDPE‐grafted maleic anhydride (PBT/HDPE‐g‐MAH) blends were prepared by the reactive extrusion approach, and the effect of blend compositions on the morphologies and properties of PBT/HDPE blends and PBT/HDPE‐g‐MAH blends was studied in detail. The results showed that flexural strength, tensile strength, and notched impact strength of PBT/HDPE blends decreased with the addition of HDPE, and flexural strength and tensile strength of PBT/HDPE‐g‐MAH blends decreased, while the notched impact strength of PBT/HDPE‐g‐MAH increased with the addition of HDPE‐g‐MAH. Compared with PBT/HDPE blends, the dimension of the dispersed phase particles in PBT/HDPE‐g‐MAH blends was decreased and the interfacial adhesion was increased. On the other hand, the effects of HDPE and HDPE‐g‐MAH contents on the crystalline and the rheological properties of the blends were also investigated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 6081–6087, 2006     

Poly(butylene terephthalate)/poly(ethylene glycol) blends with compatibilizers

Polymer blend systems offer a versatile approach for tailoring the properties of polymer materials for specific applications. In this study, we investigated the compatibility of polybutylene terephthalate (PBT) and poly(ethylene glycol) (PEG) blends processed using a twin-screw extruder, with the aim of enhancing their compatibility. Phthalic anhydride (PAn) and phthalic acid (PAc) were used as potential compatibilizers at different concentrations to improve interfacial interactions between PBT and PEG. Blend morphologies were characterized using scanning electron microscopy, which revealed improved interfacial compatibility and reduced phase separation with the incorporation of small amounts of PAn and PAc. Differential scanning calorimetry analysis indicated changes in the melting temperature (T_m) and glass transition temperature (T_g) of the blends owing to the compatibilizing effects of PAn and PAc. Dynamic mechanical analysis further corroborated the influence of the compatibilizers on the T_g and viscoelastic behavior. Thermogravimetric analysis demonstrated enhanced thermal stability with the addition of either PAn or PAc. Rheological measurements indicated an increase in complex viscosity with increasing compatibilizer content, indicating improved compatibility. The degradation point (T_d) of PBT/PEG blend increased from 158 to 200 and 319°C with the incorporation of 5 phr PAn and 2 phr PAc, respectively. Mechanical properties, including tensile strength, Young's modulus, and Izod impact strength, were evaluated. For instance, the tensile strength of PBT/PEG blend was enhanced from 43.5 to 48.7 and 49.7 MPa by incorporating 5 phr PAn and 2 phr PAc, respectively. However, the impact strength of PBT/PEG blend increased from 3.0 to 4.3 and 4.2 kJ/m² with the addition of 1 phr PAn and 1 phr PAc, respectively. The findings demonstrated that adding 5 phr PAn or 2 phr PAc to the PBT/PEG blends was advantageous, achieving a harmony of performance benefits and compromises. Rheological observations contributed significantly to the mechanical and thermal properties. Overall, the study highlights the significance of utilizing PAn and PAc as effective compatibilizers for enhancing the properties of PBT/PEG blends, making them potential candidates for various applications.     

PA6/PBT共混物的增容改性研究

采用固体环氧树脂(EP)反应增容聚酰胺6/聚对苯二甲酸丁二醇酯(PA6/PBT)共混物。结果表明:EP的加入降低了共混物的界面张力,使分散相粒径明显细化;当PA6/PBT=80/20,EP含量为1～1.5份时,共混物的改性效果较好;当PA6用量少于30份或超过70份时,EP的加入可明显提高共混物的冲击性能和拉伸性能;随着EP的加入,共混物的流动性降低。