悬浮接枝法制备抗冲聚丙烯的研究
发布时间：2018-07-16 17:02
【摘要】：本文主要针对聚丙烯(PP)韧性差的缺点,以反应器颗粒技术制备的具有多孔结构的PP作为基体材料,过氧化苯甲酰作为引发剂,通过悬浮接枝聚合的方法在PP基体上接枝交联共聚物,以接枝的交联共聚物作为“橡胶相”,实现对PP的增韧。主要研究工作如下:(1)以丙烯酸丁酯(BA)为接枝单体,聚丙二醇二甲基丙烯酸酯(PPGDMA)为交联单体,研究了不同反应条件对聚丙烯接枝丙烯酸丁酯/聚丙二醇二甲基丙烯酸酯(PP-g-(BA-co-PPGDMA))的接枝率(GP)、接枝效率(GE)和熔融指数(MFI)的影响。随着单体加入总量的增加,反应的GP逐渐增加,PP-g-(BA-co-PPGDMA)接枝产物的MFI下降,流动性变差。差示扫描量热分析显示:PP-g-(BA-co-PPGDMA)接枝产物的熔点降低,结晶温度升高。力学性能测试结果显示,随着单体加入总量的增加,PP-g-(BA-co-PPGDMA)接枝产物的缺口冲击强度先升高后降低,拉伸强度先降低后趋于平稳。当PPGDMA/BA为1/7,单体加入总量为PP重量的10%时,PP-g-(BA-co-PPGDMA)接枝产物的缺口冲击强度是6.7 kJ/m2(纯PP的2.6倍),且拉伸强度有略微的升高,为 39.2 MPa(纯 PP 的 1.1 倍)。(2)以BA为接枝单体,以丙烯酸酯化蓖麻油(ACO)为交联单体,研究了不同反应条件对聚丙烯接枝丙烯酸丁酯/丙烯酸酯化蓖麻油(PP-g-(BA-co-ACO))的GP、GE和MFI的影响。交联单体ACO的加入,能够明显降低PP-g-(BA-co-ACO)接枝产物的流动性。通过扫描电镜(SEM)分析可知,BA与ACO的交联共聚物在PP基体中的分散尺寸为0.1-1微米。随着单体加入总量的增加,反应的GP从5.8%增加到21.3%,PP-g-(BA-co-ACO)接枝产物的相对结晶度降低。动态力学热分析(DMTA)结果显示,PP的玻璃化温度(Tg)从22℃降低至15℃。当ACO/BA比例为1/9,两种单体加入总量为PP重量的5%时,PP-g-(BA-co-ACO)接枝产物的缺口冲击强度从原料PP的2.0 kJ/m2增加至3.8 kJ/m2(纯PP的1.9倍),此时拉伸强度从37.0 MPa降至35.0 MPa(纯PP的95%)。随着单体加入总量的增加,PP-g-(BA-co-ACO)接枝产物的缺口冲击强度最高可达9.0 kJ/m2(纯PP的4.5倍),同时拉伸强度还能保持在30.0MPa左右(纯PP的81%)。
[Abstract]:In this paper, polypropylene (PP) with porous structure was used as matrix material and benzoyl peroxide as initiator, aiming at the disadvantage of poor toughness of polypropylene (PP). The graft copolymer was grafted onto PP matrix by suspension graft polymerization, and the toughening of PP was realized by using the graft copolymer as the "rubber phase". The main research works are as follows: (1) Polypropylene glycol dimethacrylate (PPGDMA) was used as crosslinking monomer with butyl acrylate (BA) as graft monomer, and polypropylene glycol dimethacrylate (PPGDMA) as crosslinking monomer. The effects of different reaction conditions on graft ratio (GP), graft efficiency (GE) and melt index (MFI) of polypropylene grafted butyl acrylate / polypropylene glycol dimethacrylate (PP-g- (BA-co-PPGDMA) were studied. With the increase of the total amount of monomer, the MFI of PP-g- (BA-co-PPGDMA) grafted product decreased and the fluidity became worse. Differential scanning calorimetry (DSC) showed that the melting point and crystallization temperature of the grafted product of BA-co-PPGDMA decreased and the crystallization temperature increased. The mechanical properties showed that the notched impact strength of PP-g- (BA-co-PPGDMA) grafted products first increased and then decreased, and the tensile strength decreased first and then stabilized with the increase of the total amount of monomers added into PP-g- (BA-co-PPGDMA). The notched impact strength of PP-g- (BA-co-PPGDMA) grafted product was 6.7 KJ / m ~ 2 (2.6 times of pure PP), and the tensile strength increased slightly to 39.2 MPA (1.1 times). (_ 2 of pure PP) with BA as graft monomer. The effects of different reaction conditions on GPGE and MFI of polypropylene grafted butyl acrylate / acrylate castor oil (PP-g- (BA-co-ACO) were studied using acrylic castor oil (ACO) as crosslinking monomer. The fluidity of PP-g- (BA-co-ACO) grafted products was obviously decreased by adding crosslinked monomer ACO. The results of scanning electron microscopy (SEM) show that the dispersion size of the crosslinked copolymers of BA and ACO in PP matrix is 0.1-1 渭 m. The relative crystallinity of PP-g- (BA-co-ACO) grafted products decreased with the increase of the total amount of monomer addition from 5.8% to 21.3%. The results of dynamic mechanical thermal analysis (DMTA) showed that the glass transition temperature (TG) of PP decreased from 22 鈩，
本文编号：2127038
[Abstract]:In this paper, polypropylene (PP) with porous structure was used as matrix material and benzoyl peroxide as initiator, aiming at the disadvantage of poor toughness of polypropylene (PP). The graft copolymer was grafted onto PP matrix by suspension graft polymerization, and the toughening of PP was realized by using the graft copolymer as the "rubber phase". The main research works are as follows: (1) Polypropylene glycol dimethacrylate (PPGDMA) was used as crosslinking monomer with butyl acrylate (BA) as graft monomer, and polypropylene glycol dimethacrylate (PPGDMA) as crosslinking monomer. The effects of different reaction conditions on graft ratio (GP), graft efficiency (GE) and melt index (MFI) of polypropylene grafted butyl acrylate / polypropylene glycol dimethacrylate (PP-g- (BA-co-PPGDMA) were studied. With the increase of the total amount of monomer, the MFI of PP-g- (BA-co-PPGDMA) grafted product decreased and the fluidity became worse. Differential scanning calorimetry (DSC) showed that the melting point and crystallization temperature of the grafted product of BA-co-PPGDMA decreased and the crystallization temperature increased. The mechanical properties showed that the notched impact strength of PP-g- (BA-co-PPGDMA) grafted products first increased and then decreased, and the tensile strength decreased first and then stabilized with the increase of the total amount of monomers added into PP-g- (BA-co-PPGDMA). The notched impact strength of PP-g- (BA-co-PPGDMA) grafted product was 6.7 KJ / m ~ 2 (2.6 times of pure PP), and the tensile strength increased slightly to 39.2 MPA (1.1 times). (_ 2 of pure PP) with BA as graft monomer. The effects of different reaction conditions on GPGE and MFI of polypropylene grafted butyl acrylate / acrylate castor oil (PP-g- (BA-co-ACO) were studied using acrylic castor oil (ACO) as crosslinking monomer. The fluidity of PP-g- (BA-co-ACO) grafted products was obviously decreased by adding crosslinked monomer ACO. The results of scanning electron microscopy (SEM) show that the dispersion size of the crosslinked copolymers of BA and ACO in PP matrix is 0.1-1 渭 m. The relative crystallinity of PP-g- (BA-co-ACO) grafted products decreased with the increase of the total amount of monomer addition from 5.8% to 21.3%. The results of dynamic mechanical thermal analysis (DMTA) showed that the glass transition temperature (TG) of PP decreased from 22 鈩，
本文编号：2127038
本文链接：https://www.wllwen.com/shekelunwen/minzhuminquanlunwen/2127038.html
