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。     

PBT/PP/POE-g-GMA共混体系结晶性能和流变行为研究

以甲基丙烯酸缩水甘油酯接枝乙烯辛烯共聚物(POE-g-GMA)为相容剂,采用转矩流变仪制备聚对苯二甲酸丁二醇酯(PBT)/聚丙烯(PP)共混体系,通过扫描电子显微镜(SEM)、旋转流变仪、差示扫描量热仪(DSC)和偏光显微镜(PLM)等分析手段对共混物进行表征。结果表明,在PBT/PP共混体系中引入POE-g-GMA后,共混体系中分散相的粒径减小,两相界面模糊;体系中出现了具有更长松弛时间的新的大分子链,使体系黏度随之增大,最终形成了"类凝胶网络"结构;共混体系的结晶性能具有组分依赖性。     

PBT/ε-PCL共混物的性能

实验通过熔融共混制备聚对苯二甲酸丁二醇酯(PBT)/聚己内酯(PCL)共混物,共混物中PCL的质量百分比从10%变化到90%,间隔为10%.实验研究PCL树脂质量百分比对共混物相容性、热性能、力学性能、相形态、熔融及结晶行为的影响.DMA和DSC热分析结果表明:PBT和PCL是部分相容体系,相容性随PCL含量的增加而增加,PCL的加入降低了PBT/PCL共混物中PBT相的熔点,改善了PBT的结晶能力.通过SEM对PBT/PCL共混物的相形态研究表明:PBT/PCL共混物具有两相结构,PCL质量含量为50%时发生相反转.力学性能分析结果表明:PCL能够增韧PBT,但效果不明显.     

乙丙嵌段共聚物改性PP/EPR共混物

以乙丙嵌段共聚物(EP)作为增容剂,采用熔融共混的方法制备了聚丙烯(PP)/二元乙丙橡胶(EPR)共混物,通过冲击试验机、电子万能试验机、动态力学分析仪、扫描电子显微镜、偏光显微镜、差示扫描量热仪、平板流变仪、熔体流动速率仪等,研究了EP添加量对PP/EPR共混物力学性能、分散相聚集态结构及加工性能的影响。结果表明,EP对PP/EPR共混物具有良好的增容作用,降低了PP相的熔点和结晶规整性,提高了PP相的结晶温度和结晶度,当EP质量分数为8%时,分散相EPR粒子直径最小、PP和EPR相容性最好,此时共混物的缺口冲击强度和断裂伸长率达到最大值,加工性能最好。     

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。     

SEBS-g-MAH对PC/PBT共混物性能影响

利用双螺杆挤出机制备聚碳酸酯(PC)/聚对苯二甲酸丁二醇酯(PBT)/马来酸酐接枝氢化苯乙烯-丁二烯-苯乙烯共聚物(SEBS-g-MAH)的共混物.通过扫描电子显微镜(SEM)、平板流变仪研究了SEBS-g-MAH对PC/PBT共混物的机械性能、断面形态结构、动态力学行为的影响.结果表明:SEBS-g-MAH提高了PC/PBT共混物的相容性,随着SEBS-g-MAH用量的增加,共混物的缺口冲击强度和断裂伸长率上升,拉伸强度和弯曲强度下降.当SEBS-g-MAH质量分数为5%时共混物的综合性能最佳,同时,SEBS-g-MAH的加入.并未对PC/PBT共混物的成型加工性能产生不良影响.     

聚酰胺树脂固化EP/PAI共混物的反应机理及性能研究

使用651型聚酰胺树脂(PA)固化环氧树脂(EP)/聚酰胺酰亚胺(PAI)共混物。结合红外谱图(IR)分析反应机制,采用差热(DSC)与热重(TGA)研究其热稳定性,通过冲击性能测试其韧性。结果表明,经PA固化的EP/PAI共混物由于其伯胺与仲胺的活性氢而发生一系列开环反应,并通过酯化反应而形成网状结构;PAI骨架中的仲胺基使共混物的主发热峰随着PAI含量的升高而下降;系统的热稳定性和冲击强度也随着PAI含量的增多而增大,当PAI含量为10 phr时,耐热性能最佳,冲击强度为10.2 k J/m~2。扫描电镜(SEM)分析结果表明,纯EP表现为脆性断裂,而加入PAI出现两相结构,使体系韧性提高。     

环氧树脂对PA6/EPDM-g-MAH共混体系性能的影响

将两种不同型号的环氧树脂（EP(903)、EP(619D)）分别与PA6/EPDM-MA体系进行共混,制备了PA6/EPDM-MA/EP三元共混物。通过力学测试、动态流变(DMA)、差示扫描量热法（DSC）研究了不同EP添加量和环氧当量对PA6/EPDM-MA/EP共混体系性能的影响。实验结果表明：添加EP可以提高PA6/EPDM-MA共混物的拉伸强度,缺口冲击强度,并随着EP含量的增加而增加;而PA6/EPDM-MA/EP三元共混体系的动态储能模量（G′）,复合黏度（η*）随着EP含量的增加而增大,损耗因子（tanδ）减小;结晶度比未加环氧的共混物的结晶度稍高,并且随着环氧含量增加先增加后降低。此外,添加EP(903)的共混物各种性能变化比EP(619D)快。     

环氧树脂对PA6/EPDM-MA共混体系性能的影响

将两种不同型号的环氧树脂（EP(903)、EP(619D)）分别与PA6/EPDM-MA体系进行共混,制备了PA6/EPDM-MA/EP三元共混物。通过力学测试、动态流变(DMA)、差示扫描量热法（DSC）研究了不同EP添加量和环氧当量对PA6/EPDM-MA/EP共混体系性能的影响。实验结果表明：添加EP可以提高PA6/EPDM-MA共混物的拉伸强度,缺口冲击强度,并随着EP含量的增加而增加;而PA6/EPDM-MA/EP三元共混体系的动态储能模量（G′）,复合黏度（η*）随着EP含量的增加而增大,损耗因子（tanδ）减小;结晶度比未加环氧的共混物的结晶度稍高,并且随着环氧含量增加先增加后降低。此外,添加EP(903)的共混物各种性能变化比EP(619D)快。     

增容作用对PVDF/PET共混物性能的影响

通过溶液聚合方法合成了甲基丙烯酸甲酯(MMA)与甲基丙烯酸缩水甘油酯(GMA)共聚物(MG),将其应用到聚偏氟乙烯(PVDF)/聚对苯二甲酸乙二醇酯(PET)共混物中,考察了MG共聚物的增容作用对PVDF/PET共混物性能的影响。采用扫描电镜(SEM)、差示扫描量热分析(DSC)、动态机械分析(DMA)、力学测试等测试方法对共混物进行表征。结果表明,PVDF/PET共混物为不相容体系,随着MG共聚物含量的增加,PVDF/PET共混物的两相玻璃化转变温度差值变小,分散相尺寸变小,共混物的断裂伸长率和屈服强度明显升高;MG共聚物显著增强了PVDF/PET共混物间的相容性,提高了共混物的性能。     

ABS-g-GMA增韧聚对苯二甲酸丁二醇酯的研究

用甲基丙烯酸环氧丙酯（（MA）接枝的丙烯腈／丁二烯／苯乙烯（ABs）接枝共聚物（ABS-g-GMA）改善聚对苯二甲酸丁二醇酯（PBT）的缺口冲击韧性。动态力学分析、差示扫描量热分析以及流变性能测试结果表明，GMA引入到ABS中，随GMA含量的增加，PBT与ABS的玻璃化转变温度相互靠近，PBT的熔点降低，共混体系的扭矩、温度提高，这些结果表明GMA提高了PBT与ABS之间的相容性；增容反应导致ABS在PBT基体中均匀、稳定分散，有利于共混物性能的改善；交联反应导致交联聚集网状结构的生成，使共混物性能变差。冲击强度结果表明，1％（质量含量。下同）GMA含量就可以导致PBT／ABS-g-GMA共混物冲击韧性显著改善，当ABS-g-GMA1含量为30％时，共混物冲击强度高达850J／m。     

环氧官能化ABS增韧PBT及其共混物

合成了甲基丙烯酸环氧丙酯(GMA)接枝的丙烯腈-丁二烯-苯乙烯(ABS-g-GMA)核壳粒子增韧聚对苯二甲酸丁二醇酯(PBT),加入环氧树脂(Epoxy)为扩链剂进一步提高共混物的性能。红外光谱(FTIR)结果表明:GMA成功接枝到ABS粒子上;研究发现不同GMA含量的ABS-g-GMA粒子在PBT及PBT/Epoxy共混物中均匀分散;ABS-g-GMA对PBT增韧效果较好,Epoxy进一步提高了PBT/ABS-g-GMA共混物的冲击韧性及拉伸强度;ABS-g-GMA增韧PBT的机理是橡胶粒子的空洞化和PBT基体的剪切屈服。     

In‐situ reinforcement of PBT/ABS blends with liquid crystalline polymer

Ternary in‐situ poly(butylene terephthalate) (PBT)/poly(acrylonitrile‐butadienestyrene) (ABS)/liquid crystalline polymer(LCP) blends were prepared by injection molding. The LCP used was a versatile Vectra A950, and the matrix material was PBT/ABS 60/40 by weight. Maleic anhydride (MA) copolymer and solid epoxy resin (bisphenol type‐A) were used as compatibilizers for these blends. The tensile, dynamic mechanical, impact, morphology and thermal properties of the blends were studied. Tensile tests showed that the tensile stregth of PBT/ABS/LCP blend in the longitudinal direction increased markedly with increasing LCP content. However, it decreased sharply with increasing LCP content up to 5 wt%; thereafter it decreased slowly with increasing LCP content in the transverse direction. The modulus of this blend in the longitudinal direction appeared to increase considerably with increasing LCP content, whereas the incorporation of LCP into PBT/ABS blends had little effect on the modulus in the transverse direction. The impact tests revealed that the Izod impact strength of the blends in longitudinal direction decreased with increasing LCP content up to 10 wt%; thereafter it increased slowly with increasing LCP. Dynamic mechanical analyses (DMA) and thermogravimetric measurements showed that the heat resistance and heat stability of the blends tended to increase with increasing LCP content. SEM observation, DMA, and tensile measurement indicated that the additions of epoxy and MA copolymer to PBT/ABS matrix appeared to enhance the compatibility between PBT/ABS and LCP.     

环氧官能化ABS增韧PBT树脂的性能研究

采用乳液聚合方法合成了甲基丙烯酸环氧丙酯(GMA)共聚的丙烯腈/丁二烯/苯乙烯核壳粒子ABS-g-GMA,用于不同分子量聚对苯二甲酸丁二醇酯(PBT)的增韧。红外光谱证明GMA接枝共聚到了ABS粒子上。DMA测试发现PBT与ABS、ABS-g-GMA之间有一定的相容性。SEM表明ABS-g-GMA均匀分散在不同分子量的PBT树脂中。ABS-g-GMA可以实现对PBT树脂的有效增韧,PBT树脂的分子量越大,增韧效率越高,共混物的断裂伸长率越大。     

Toughening of poly(butylene terephthalate) with epoxy-functionalized acrylonitrile-butadiene-styrene

Glycidyl methacrylate (GMA) functionalized acrylonitrile-butadiene-styrene (ABS) copolymers have been prepared via an emulsion polymerization process. These functionalized ABS copolymers (ABS-g-GMA) were blended with poly(butylene terephthalate) (PBT). DMA result showed PBT was partially miscible with ABS and ABS-g-GMA, and DSC test further identified the introduction of GMA improved miscibility between PBT and ABS. Scanning electron microscopy (SEM) displayed a very good dispersion of ABS-g-GMA particles in the PBT matrix compared with the PBT/ABS blend when the content of GMA in PBT/ABS-g-GMA blends was relatively low (<8 wt% in ABS-g-GMA). The improvement of the disperse phase morphology was due to interfacial reactions between PBT chains end and epoxy groups of GMA, resulting in the formation of PBT-co-ABS copolymer. However, a coarse, non-spherical phase morphology was obtained when the disperse phase contained a high GMA content (≥8 wt%) because of cross-linking reaction between the functional groups of PBT and GMA. Rheological measurements further identified the reactions between PBT and GMA. Mechanical tests showed the presence of only a small amount of GMA (1 wt%) within the disperse phase was sufficient to induce a pronounced improvement of the impact and tensile properties of PBT blends. SEM results showed shear yielding of PBT matrix and cavitation of rubber particles were the major toughening mechanisms.     

液晶离聚物在ABS/PBT共混体系中的增容研究

合成了一种含有磺酸基的液晶离聚物（LCI）,并研究了LCI作为相容剂对丙烯腈-丁二烯-苯乙烯三元共聚物/聚对苯二甲酸丁二醇酯（ABS/PBT）共混体系力学性能的影响。采用扫描电镜（SEM）、差示扫描量热仪（DSC）和热失重（TGA）分析对ABS/PBT/LCI共混物的热性能、微观形态和相容性进行了研究。研究结果表明LCI的加入,改善了二者的相容性,从而提高了共混物的拉伸强度、断裂伸长率以及缺口冲击强度。     

Influence of epoxy resin on the morphological and rheological properties of PBT/ABS blends compatibilized by ASMA

Polybutylene terephthalate (PBT)/acrylonitrile–butadiene–styrene (ABS) copolymer blends compatibilized by a mixture of styrene–acrylonitrile–maleic anhydride (ASMA) copolymers and epoxy resin (EP) were prepared through melt reactive extrusion. The morphological, rheological, and mechanical properties of these blends were studied. The epoxy functional groups of EP can react with anhydride groups of ASMA and the PBT terminal groups (? OH and ? COOH) simultaneously, leading to the formation of ASMA–EP–PBT graft copolymers. Because of the effective compatibilization of these copolymers at the interface, finer dispersed phase morphologies were obtained. Compared with PBT/ABS/ASMA blends, the addition of EP induced a more stable molten phase structure, with increases of storage moduli, loss moduli, and dynamic viscosities. Results indicated that 1.5 wt% of the EP in the blends was most suited for the compatibilization. Impact properties of these blends were also investigated. POLYM. ENG. SCI., 47:1943–1950, 2007. © 2007 Society of Plastics Engineers     

游离链段在环氧官能化ABS增韧PBT中的作用研究

采用种子乳液聚合方法,在聚丁二烯(PB)表面接枝苯乙烯(St)、丙烯腈(AN)和甲基丙烯酸环氧丙酯(GMA),合成了具有反应活性的ABS-g-GMA核-壳改性剂;通过超速离心方法将改性剂中的苯乙烯-丙烯腈-甲基丙烯酸环氧丙酯共聚物(SAN-co-GMA)游离链段分离出来,得到了ABS-g-GMA'核-壳改性剂;最后将分...     

Effect of ABS grafting degree and compatibilization on the properties of PBT/ABS blends

Blends of PBT/ABS and PBT/ABS compatibilized with styrene‐acrylonitrile‐glycidyl methacrylate (SAG) copolymer were prepared by melt blending method. Grafting degree (GD) of ABS influences the morphology and mechanical properties of PBT/ABS blends. ABS can disperse in PBT matrix uniformly and PBT/ABS blends fracture in ductile mode when ABS grafting degree is more than 44.8%, otherwise, agglomeration takes place and PBT/ABS blends fracture in brittle way. On the other hand, the grafting degree of ABS has no obvious influence on the morphology of PBT/ABS blends and PBT/ABS blends fracture in ductile mode when SAG is incorporated since the compatibilization effect. However, PBT/SAG/ABS blends display much lower impact strength values comparing with PBT/ABS when the blends fracture in ductile way. Side reactions in PBT/SAG/ABS blends were analyzed and which were the main reason for the decrease of impact strength of PBT blends. Tensile tests show that the tensile strength and tensile modulus of PBT blends decrease with the increase of ABS grafting degree due to the higher effective volume. PBT/SAG/ABS blends display much higher tensile properties than PBT/ABS blends since the compatibilization effect. POLYM. COMPOS., 28:484–492, 2007. © 2007 Society of Plastics Engineers     

pCBT/ABS共混合金的制备与表征

采用原位聚合法制备了原位聚合聚对苯二甲酸丁二酯(pCBT)/丙烯腈-丁二烯-苯乙烯塑料(ABS)共混合金,并对共混合金进行了差示扫描量热、动态热机械、扫描电子显微镜、广角X射线衍射和力学性能研究.结果表明,加入ABS可有效降低pCBT的结晶度,共混合金在保持较好刚性的同时,韧性有所提高.当ABS用量为1份时,共混合金的...