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。     

环氧官能化ABS核壳比对增韧PBT性能的影响

采用种子乳液聚合的方法,合成了不同核壳比的甲基丙烯酸缩水甘油酯接枝丙烯腈-丁二烯-苯乙烯塑料耐冲击改性剂(ABS-g-GMA).将合成的耐冲击改性剂用于增韧聚对苯二甲酸丁二酯(PBT),考察耐冲击改性剂核壳比对增韧PBT拉伸性能、缺口冲击强度以及相容性的影响.结果表明,耐冲击改性剂的核壳比对增韧PBT有重要的影响.耐冲...     

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。     

丙烯酸丁酯-苯乙烯-丙烯腈共聚物/二氧化钛复合薄膜的制备、表征及性能

先以丙烯酸丁酯、苯乙烯和丙烯腈为原料,通过种子乳液聚合制得了以聚丙烯酸丁酯为核、苯乙烯-丙烯腈共聚物为壳的核壳接枝共聚物ASA;再以钛酸正四丁酯和偶联剂γ-(甲基丙烯酰氧基)丙基三甲氧基硅(KH-570)为原料,经水解缩合生成KH-570-g-TiO<,2>粒子.将ASA与KH-570-g-TiO<,2>粒子按照一定比...     

PBT/ABS共混物中游离SAN链段的作用研究

采用种子乳液聚合技术合成核/壳质量比为60/40的丙烯腈-丁二烯-苯乙烯(ABS)核-壳结构改性剂,将ABS改性剂与聚对苯二甲酸丁二醇酯(PBT)熔融共混,制备PBT/ABS共混物。考察了ABS改性剂中游离的苯乙烯-丙烯腈(SAN)链段对PBT/ABS性能的影响。结果表明,游离链段对共混物相容性影响不大,但能够显著降低共混物的加工黏度,并且可以提高共混物的冲击强度、弯曲强度和断裂伸长率。也就是说,ABS改性剂中游离链段的存在对共混物的性能起积极作用。     

一种抗滴落、热塑化的橡胶接枝共聚物及其制备方法

正由广东盛化塑胶科技有限公司申请的专利(公开号CN 104945578A,公开日期2015-09-30)"一种抗滴落、热塑化的橡胶接枝共聚物及其制备方法",涉及的橡胶接枝共聚物具有由核层和壳层组成的核壳结构,核层为聚(四氟乙烯接枝丁二烯),且呈纳米级的两相互穿网络结构,壳层为由甲基丙烯酸烷基酯、苯乙烯和丙烯腈中的至     

悬浮聚合法制备ASA树脂及其性能研究

采用悬浮聚合法,以丙烯酸丁酯、苯乙烯和丙烯腈为原料,合成了一系列丙烯酸丁酯-苯乙烯-丙烯腈(ASA)树脂。考察了橡胶相聚丙烯酸丁酯(PBA)、甲基丙烯酸烯丙酯(ALMA)和叔十二碳硫醇(TDDM)用量对ASA树脂的力学性能影响。结果表明:PBA质量分数达到20%后,ASA树脂的冲击强度大幅增加。TDDM的加入使苯乙烯-丙烯腈(SAN)的相对分子质量降低,当其质量分数低于1%时,ASA树脂的冲击强度呈升高趋势,质量分数高于1%时其冲击强度大幅降低。随PBA含量增加,ASA树脂的拉伸强度减小,断裂伸长率变大。     

耐候型ASA树脂的制备及其性能研究

采用悬浮聚合法,以丙烯酸丁酯、苯乙烯和丙烯腈为原料,合成了一系列丙烯酸丁酯-苯乙烯-丙烯腈(ASA)树脂。考察了橡胶相聚丙烯酸丁酯(PBA)、交联剂二甲基丙烯酸乙二醇酯(EGDMA)、接枝剂甲基丙烯酸烯丙酯(ALMA)和摩尔质量调节剂十二烷基硫醇(TDDM)的用量对ASA树脂的冲击强度的影响;PBA质量分数对ASA树脂的拉伸强度和断裂伸长率的影响。结果表明:PBA质量分数达到20%后,ASA树脂的冲击强度大幅增加;EGDMA、ALMA和TDDM的质量分数分别为0.43%、0.4%和1%时,ASA树脂的冲击强度达到最大值;随PBA增加,ASA树脂的拉伸强度减小,断裂伸长率变大。     

纳米SiO_2核壳粒子改性聚乳酸的研究

将粒径为80 nm的二氧化硅(SiO_2)用硅烷偶联剂KH570改性,然后与丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸环氧丙酯(GMA)进行乳液聚合制备了不同核壳比的SiO_2-g-(MMA-co-BA-co-GMA)纳米核壳粒子,研究了核壳粒子对聚乳酸(PLA)结构和性能的影响。结果表明,纳米SiO_2核壳粒子在PLA中部分聚集;DMA测试表明核壳粒子与PLA具有一定的相容性,SiO_2含量高,材料储能模量越大;DSC发现核壳粒子加入有利于结晶;TGA结果证明SiO_2提高了PLA的耐热性;冲击测试发现核壳粒子提高了PLA的冲击韧性。     

一种抗滴落、热塑化的橡胶接枝共聚物及其制备方法

<正>本发明属于抗滴落剂技术领域,特别涉及一种抗滴落、热塑化的橡胶接枝共聚物,共聚物具有由核层和壳层组成的核壳结构,核层为聚(四氟乙烯～接枝～丁二烯),并且核层呈纳米级的两相互穿网络结构,壳层为由甲基丙烯酸烷基酯、苯乙烯和丙烯腈中的至少一种单体聚合而成的聚合物层;壳层的质量与核层     

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。     

ACR-g-GMA的制备及对PBT的增韧

要采用乳液聚合方法合成了以丙烯酸丁酯(BA)为橡胶相内核,甲基丙烯酸甲酯(MMA)为壳层,并在壳层接枝甲基丙烯酸环氧丙酯(GMA)的核壳结构聚合物(AcR-g-GMA)。用其增韧聚对苯二甲酸丁二醇酯(PBT),制备PBT/ACR-g-GMA合金。用傅立叶变换红外光谱考察接枝聚合物的环氧基团;用电子显微镜观察共混物中粒子分布的微观形态;测试了共混物的力学性能。结果表明:采用乳液聚舍方法能够将GMA接枝到ACR上,GMA可以增强两相间的界面结合力,ACR-g-GMA粒子能有效地增韧PBT。当ACR-g-GMA粒子中GMA的质量分数为3%,m(PBT)/m(ACR-g-GMA)为80/20时,共混物的缺口冲击强度可高达389 J/m。     

Contribution of Ungrafted Segments in Core-Shell Impact Modifier in the Toughening of PBT Resins by Epoxy Functionalized Poly(Butadiene-graft-Styrene)

A series of poly(butadiene-graft-styrene) core-shell impact modifiers and glycidyl methacrylate functionalized PB-g-PS (PB-g-PSG) with different glycidyl methacrylate content were synthesized by seeds emulsion polymerization. The modifiers were used to toughen poly(butylene terephthalate) resins. The results showed that poly(butylene terephthalate) was efficiently toughened by functionalized PB-g-PSG but not by poly(butadiene-graft-styrene). The introduction of glycidyl methacrylate improved the miscibility and properties. The effects of the ungrafted segments in modifiers on the properties of blends were investigated. The miscibility and properties dropped after the ungrafted segments in modifiers were separated. Results indicated that ungrafted PS segments showed positive effect on toughening of poly(butylene terephthalate).     

环氧树脂对聚对苯二甲酸丁二酯共混物的增韧增强研究

利用环氧树脂(EP)与聚对苯二甲酸丁二醇酯(PBT)的相容性,考察了EP对共混物PBT/ABS-gGMA性能的影响。采用动态力学分析仪(DMA)、旋转流变仪、Haake流变仪和扫描电镜(SEM)研究共混物的性能。DMA、DSC和旋转流变仪的测试结果表明PBT与EP是相容的;流变性能测试结果表明EP对PBT/ABS-g-GMA共混体系起到增容作用;SEM观察结果发现少量的EP加入对共混物的相形态没有明显影响,分散相在PBT基体中均匀、稳定分散,而过量的EP使共混物中出现一些较大的相区,分散相发生团聚;力学性能测试结果表明适量的EP就能明显提高共混物的冲击性能,而过量的EP又会使共混物的冲击强度下降。     

Modification of the reactive core-shell particles properties to prepare PBT/PC blends with higher toughness and stiffness

Glycidyl methacrylate (GMA) functionalized methyl methacrylate-butadiene-styrene core-shell particles (PB-g-MSG) were prepared to toughen poly (butylene terephthalate) (PBT) and polycarbonate (PC) blends. T-dodecyl mercaptan (TDDM) was used to modify the grafting character of the core-shell particles. The addition of TDDM decreased the grafting degree, particles size and crosslinking degree of PB-g-MSG particles. At the same time, the free methyl methacrylate-co-styrene-co-glyceryl methacrylate copolymer (f-MSG) increased. The f-MSG reacted with PBT and suppressed the transesterification between PBT and PC. On the other hand, f-MSG promoted the crystallization of PBT by heterogeneous nucleation. When the TDDM content was lower than 0.76%, PB-g-MSG particles dispersed in the matrix uniformly, otherwise, agglomeration took place. The change of TDDM content in the PB-g-MSG particles influenced the toughening ability and tensile properties. When the TDDM content was 0.76%, the PBT/PC/PB-g-MSG blend showed the optimum impact toughness and yield strength, which are 908 J/m and 49.4Mpa. Fracture mechanism results indicated that cavitation induced shear yielding occurred in the PBT/PC/PB-g-MSG blend when no TDDM addition for the core-shell particles. With the addition of TDDM, the interfacial strength decreased between the PB-g-MSG core-shell particles and the matrix. So voids appeared due to debonding, which also could promote the shear yielding process.     

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     

Poly(Butylene Terephthalate)/Polyacrylic Blends with Enhanced Toughness

An improved toughness-stiffness balance was achieved in PBT matrix by adding poly(n-butyl acrylate)/poly(methyl methacrylate-co-glycidyl methacrylate) (PBMG) core-shell structured copolymer.

A series of poly(n-butyl acrylate)/poly(methyl methacrylate-co-glycidyl methacrylate) (PBMG), core-shell structured modifiers with different contents of functional monomer (glycidyl methacrylate) were prepared, and the effects on mechanical properties of poly(butylene terephthalate) (PBT) blends were investigated. The morphology of the core-shell structure was confirmed by means of transmission electron microscopy. Scanning electron microscopy was used to observe the morphology of the fractured surfaces. The dynamic mechanical analyses of PBT/PBMG blends showed two merged transition peaks of the PBT matrix, with the presence of PBMG core-shell structured modifier, which were responsible for the improvement of PBT toughness.      

Deformation of rubber-toughened polycarbonate: Macroscale analysis of the damage zone

Two commercial core-shell rubbers were used as impact modifiers for polycarbonate (PC). Specimens with a single semicircular edge notch were stretched uniaxially in order to study the prefracture damage evolution of blends under a triaxial tensile stress state. The irreversible deformation of modified PC included a cavitation mechanism in addition to the three shear modes of unmodified PC. At the macroscopic level, the cavitation condition could be described by a mean stress concept. The corresponding critical volume strain for cavitation in PC blends was determined to be independent of rubber content but differed for the two impact modifiers. The critical volume strain for cavitation was used as an index of cavitation resistance for the impact modifiers. The effect of rubber content and temperature on Izod impact strength of the PC blends was also reported. From the relationship between the cavitation resistance and the Izod impact strength, it was proposed that impact modifiers with a higher cavitation resistance impart better toughness to blends with PC. © 1994 John Wiley & Sons, Inc.     

Effect of core-shell particles dispersed morphology on the toughening behavior of PBT/PC blends

Methyl methacrylate-co-styrene-co-glycidyl methacrylate grafted polybutadiene (PB-g-MSG) and styrene-co-glycidyl methacrylate grafted polybutadiene (PB-g-SG) core-shell particles were prepared to toughen poly (butylene terephthalate) (PBT) and polycarbonate (PC) blends. The compatibilization reaction between the epoxy groups of glycidyl methacrylate and the carboxyl groups of PBT induced the PB-g-SG particles dispersed in the PBT phase. On the other hand, the good miscibility between PMMA (the shell phase of PB-g-MSG) and PC induced the PB-g-MSG particles dispersed in the PC phase. The different phase morphology led to different toughening behavior. The PBT/PC/PB-g-MSG blends with the PC encapsulated morphology showed much lower brittle-ductile transition core-shell particles content (10-15 wt% or 15-20 wt%) compared with the PBT/PC/PB-g-SG blends (20-25 wt%). The difference between the toughening efficiency of the core-shell particles was due to the change of deformation mechanisms. In PBT/PC/PB-g-MSG blends, the cavitation of PB rubber phase led to the occurrence of shear yielding of the matrix. While in the PBT/PC/PB-g-SG blends, the debonding between PBT and PC interface induced the shear yielding of the matrix. The variation of the core-shell particles dispersed phase morphology also affected the crystallization properties and DMA results of the PBT/PC blends. Modification of the phase morphology provided an useful strategy to prepare PBT/PC blends with higher toughening efficiency.