PP/ABS共混体系的相容性及结晶行为的研究
摘要
在0-25%ABS含量的范围内,将ABS与两种聚丙烯((均聚聚丙烯(iPP)和共聚聚丙烯(coPP))熔融共混,主要讨论了ABS和两种聚丙烯的相容性及ABS对两种PP的力学性能,结晶行为及流变性能的影响,并考察了增容剂SBS、SEBS对共混体系的相容性的影响。全面研究了树脂种类、共混物的组分含量、等温结晶的温度、退火时间对ABS诱导生成β晶的影响。通过拉伸及冲击试验考察了PP/ABS共混体系机械性能;综合运用示差扫描量热法(DSC),偏光显微镜(POM)、广角X射线衍射(WAXD)研究了ABS对两种PP结晶性能及ABS对β晶型的影响。通过机械性能、流变性能分析和扫描电子显微镜(SEM)对ABS和两种PP的相容性进行了研究。
通过力学分析表明:在0-25%ABS含量的范围内,ABS的加入使共混体系的拉伸强度有小幅度的增加,而两种共混体系的断裂伸长率随着ABS含量的增加而迅速降低。iPP/ABS共混体系中,当ABS含量为5%时,共混体系的冲击强度达到最大值,随后其冲击强度随ABS含量的增加而一直减小;而在coPP/ABS共混体系中,共混体系的冲击强度随ABS含量的增加而一直减小。流变分析表明:总共混体系的表观粘度均低于纯PP和纯ABS的表观粘度,共混体系为不相容体系,加入相容剂SBS、SEBS后,共混体系中的表观粘度有所提高,但共混体系仍为不相容体系,且SBS的增容效果要好于SEBS。
通过偏光显微镜的结晶形态表明:加入少量的ABS树脂能明显改变PP球晶的大小,并且能诱导PP生成β晶型。在本次试验范围内,在ABS含量为30%时,β晶的尺寸最大,继续增加ABS的含量结晶尺寸减小。
采用DSC、WAXD分析考察了ABS对两种PP结晶性能及ABS对iPP诱导产生β晶的影响。结果表明:ABS的加入,使PP的熔点降低,而对起始结晶温度(T_(oc))和峰值结晶温度(T_c)并未有很有明显的改变,随着ABS的加入,PP的结晶度有所增加;而ABS的含量超过某一临界值时,结晶度有所下降,且晶粒尺寸击几乎不受ABS含量的影响。
通过分析iPP/ABS共混体系中ABS诱导产生β晶的条件。结果表明:在5%-90%ABS含量的范围内,ABS均能诱导生成β晶,作为ABS结构的一部分,K树脂和SBS均不能产生,ABS因其特殊的结构能诱导生成β晶,iPP/ABS共混体系中生成β晶的最高临界温度为130oC,而共混体系无最低临界温度,在200oC的熔体中退火600min后,β晶消失。
With ABS content of 0-25 wt.%, the ABS and two different brands of PP(homopolymerization PP/iPP and copolymerzation PP/coPP) was mixed in a twin-screw extruder and followed by injection molding in into standard samples for test. The influence of content of ABS on mechanical properties, crystallization behavior and rheology properties of blends and the miscibility of PP/ABS was mainly studied. The compatilizaion effect of compatibilizer SBS and SEBS on the blends was discussed. The influence of resin type, composition, crystallization temperature, annealing time on the ABS inducedβ-iPP was also investigated. The mechanical properties was carried out by tensile and impact test; the influence of ABS on the crystallization behavior of PP andβ-iPP was investigated by differential scanning calorimeter(DSC), polarized optical microscopy(POM) , wide angle X-ray diffraction (WAXD); the miscibility of PP/ABS blends was determined by mechanical properties, rheology analysis, scanning electron microscopy(SEM).
The effect of ABS on mechanical properties of PP/ABS blends was investigated. The results shows that the tensile strength has little improvement and the elongation at break decrease with ABS addition from 0% to 25%. The iPP/ABS blend got the maximum impact strength when the ABS content is 5 wt.%, then it decrease with the ABS further addition; at the same time, the impact strength of coPP/ABS blend decrease with ABS addition.
The rheology results shows that shear viscosity of blend below the pure PP and pure ABS and implied that the blends is immiscible. With the SBS and SEBS addition, the shear viscosity increased, bur the blend is still a immiscible system. The compatiblizing effect of SBS is better than SEBS.
The crystal structure and morphology of PP/ABS blends were investigated by POM. The results showed the size of spherulites of PP decreased with small amount of ABS and ABS can induceβ-iPP in blends. In this experiment, the size ofβ-iPP got maximum when then ABS content is 30 wt.%, then the size decrease when the ABS further addition.
The influence of ABS on crystallization performance of PP and ABS induceβ-iPP were investigated by DSC and WAXD. The results shows that the melt point (Tm) of PP decreased, but oneset crystallization temperature (T_(oc)) and crystallization temperature(T_c) has little change. The crystallinity of PP increased with ABS addition; it decreased when ABS component beyond critical content. But ABS has little effect on the crystallite size of PP.
Investigate the condition that ABS induce theβ-iPP, the results shows that ABS can induceβ-iPP with ABS content from 5% to 90%. But the K resin and SAN which was the part of ABS can not induce theβ-iPP . The upper critical temperature(Tc*) of iPP/ABS is 130 oC and there is no the lower critical temperature(Tc**). The annealing experiments for iPP/ABS blens at 200 oC exhibited that theβ-iPP disappeared when the annealing time reached 600 min.
通过力学分析表明:在0-25%ABS含量的范围内,ABS的加入使共混体系的拉伸强度有小幅度的增加,而两种共混体系的断裂伸长率随着ABS含量的增加而迅速降低。iPP/ABS共混体系中,当ABS含量为5%时,共混体系的冲击强度达到最大值,随后其冲击强度随ABS含量的增加而一直减小;而在coPP/ABS共混体系中,共混体系的冲击强度随ABS含量的增加而一直减小。流变分析表明:总共混体系的表观粘度均低于纯PP和纯ABS的表观粘度,共混体系为不相容体系,加入相容剂SBS、SEBS后,共混体系中的表观粘度有所提高,但共混体系仍为不相容体系,且SBS的增容效果要好于SEBS。
通过偏光显微镜的结晶形态表明:加入少量的ABS树脂能明显改变PP球晶的大小,并且能诱导PP生成β晶型。在本次试验范围内,在ABS含量为30%时,β晶的尺寸最大,继续增加ABS的含量结晶尺寸减小。
采用DSC、WAXD分析考察了ABS对两种PP结晶性能及ABS对iPP诱导产生β晶的影响。结果表明:ABS的加入,使PP的熔点降低,而对起始结晶温度(T_(oc))和峰值结晶温度(T_c)并未有很有明显的改变,随着ABS的加入,PP的结晶度有所增加;而ABS的含量超过某一临界值时,结晶度有所下降,且晶粒尺寸击几乎不受ABS含量的影响。
通过分析iPP/ABS共混体系中ABS诱导产生β晶的条件。结果表明:在5%-90%ABS含量的范围内,ABS均能诱导生成β晶,作为ABS结构的一部分,K树脂和SBS均不能产生,ABS因其特殊的结构能诱导生成β晶,iPP/ABS共混体系中生成β晶的最高临界温度为130oC,而共混体系无最低临界温度,在200oC的熔体中退火600min后,β晶消失。
With ABS content of 0-25 wt.%, the ABS and two different brands of PP(homopolymerization PP/iPP and copolymerzation PP/coPP) was mixed in a twin-screw extruder and followed by injection molding in into standard samples for test. The influence of content of ABS on mechanical properties, crystallization behavior and rheology properties of blends and the miscibility of PP/ABS was mainly studied. The compatilizaion effect of compatibilizer SBS and SEBS on the blends was discussed. The influence of resin type, composition, crystallization temperature, annealing time on the ABS inducedβ-iPP was also investigated. The mechanical properties was carried out by tensile and impact test; the influence of ABS on the crystallization behavior of PP andβ-iPP was investigated by differential scanning calorimeter(DSC), polarized optical microscopy(POM) , wide angle X-ray diffraction (WAXD); the miscibility of PP/ABS blends was determined by mechanical properties, rheology analysis, scanning electron microscopy(SEM).
The effect of ABS on mechanical properties of PP/ABS blends was investigated. The results shows that the tensile strength has little improvement and the elongation at break decrease with ABS addition from 0% to 25%. The iPP/ABS blend got the maximum impact strength when the ABS content is 5 wt.%, then it decrease with the ABS further addition; at the same time, the impact strength of coPP/ABS blend decrease with ABS addition.
The rheology results shows that shear viscosity of blend below the pure PP and pure ABS and implied that the blends is immiscible. With the SBS and SEBS addition, the shear viscosity increased, bur the blend is still a immiscible system. The compatiblizing effect of SBS is better than SEBS.
The crystal structure and morphology of PP/ABS blends were investigated by POM. The results showed the size of spherulites of PP decreased with small amount of ABS and ABS can induceβ-iPP in blends. In this experiment, the size ofβ-iPP got maximum when then ABS content is 30 wt.%, then the size decrease when the ABS further addition.
The influence of ABS on crystallization performance of PP and ABS induceβ-iPP were investigated by DSC and WAXD. The results shows that the melt point (Tm) of PP decreased, but oneset crystallization temperature (T_(oc)) and crystallization temperature(T_c) has little change. The crystallinity of PP increased with ABS addition; it decreased when ABS component beyond critical content. But ABS has little effect on the crystallite size of PP.
Investigate the condition that ABS induce theβ-iPP, the results shows that ABS can induceβ-iPP with ABS content from 5% to 90%. But the K resin and SAN which was the part of ABS can not induce theβ-iPP . The upper critical temperature(Tc*) of iPP/ABS is 130 oC and there is no the lower critical temperature(Tc**). The annealing experiments for iPP/ABS blens at 200 oC exhibited that theβ-iPP disappeared when the annealing time reached 600 min.
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