PP-g-GMA的制备及其改性PP/PA6合金性能

采用双螺杆熔融接枝的方法,在引发剂过氧化二异丙苯(DCP)作用下,将甲基丙烯酸缩水甘油酯(GMA)和共单体苯乙烯(St)接枝到聚丙烯(PP)上。通过傅立叶变换红外光谱仪确定了接枝物的生成,采用酸碱滴定法测定了接枝率。探讨了GMA,St,DCP不同用量对PP接枝物的接枝率和熔体流动速率的影响,并将接枝产物PP–g–(St–co–GMA)加入PP/尼龙6(PA6)的合金中,通过注塑成型样条,测定其力学性能,并观察微观结构。结果表明,St的加入能够提高接枝率,抑制副反应的发生。在PP/PA6合金中加入接枝物PP–g–(St–co–GMA),其拉伸强度可提高46.45%,弯曲强度可提高32.47%,但对冲击强度影响不大。     

PP-g-GMA的制备及其增容PP/PA6共混物的性能

通过熔融接枝反应制备了甲基丙烯酸缩水甘油酯接枝聚丙烯（PP-g-GMA）,并将其作为聚丙烯/聚酰胺6（PP/PA6）共混物的相容剂,研究了PP-g-GMA对PP/PA6共混物的力学性能及形态结构的影响。结果表明,采用滴定法测得PP-g-GMA接枝率为3.35 %;当PP-g-GMA的添加量为4 %（质量分数,下同）和8 %时,PP/PA6/PP-g-GMA共混物的拉伸强度和缺口冲击强度分别较PP/PA6共混物提高了32.4 %和60.4 %;PP-g-GMA显著改善了PP/PA6 共混物的界面相容性,是PP/PA6共混物的有效增容剂。     

GMA/St双组分单体熔融接枝聚丙烯的研究

分别以甲基丙烯酸缩水甘油酯（GMA）和马来酸酐（MAH）为接枝单体，苯乙烯（St）为接枝共单体，过氧化二异丙苯（DCP）为引发剂对聚丙烯（PP）进行熔融接枝，研究了接枝单体的种类、组分配比等因素对PP的接枝率和熔体流动速率等的影响，并研究了接枝PP的力学性能和耐热变形性能。实验结果表明：作为接枝单体，GMA比MAH更具有优越性；双组分单体熔融接枝PP的接枝率和性能优于单组分单体熔融接枝；接枝PP的结晶参数受其接枝率的影响；当PP／GMA／St／DCP=100／6／3／0、3时，PP—g^-（GMA—CO—St）的接枝率最高，力学性能和耐热变形性能最好。     

PP-g-MAH和PP-g-GMA增容PP/PA6共混体系的研究

将自制的PP—g—MAH（聚丙烯接枝马来酸酐）及PP—g—GMA（聚丙烯接枝甲基丙烯酸缩水甘油酯）作为PP／PA6共混体系的相容剂，研究了加入聚丙烯接枝物后PP，PA6塑料合金的各种力学性能及形态结构。结果表明：在PP／PA6共混物中加入PP—g—MAH后，共混物的力学性能得到明显的提高．添加PP—g—MAH对不同比例PP／PA6共混物力学性能的影响不同；用PP—g—MAH和PP—g—GMA两种接枝物共同作为相容剂加入到PP／PA6共混物中比单独使用一种的效果要好。共混物的SEM照片表明。PP—g—MAH是PP／PA6共混物的有效增容剂。     

相容剂C的辐射合成及在PA6／ABS合金中的应用

本工作采用SAN粉料作基材、甲基丙烯酸缩水甘油酯（GMA）作接枝单体,运用辐射接枝技术合成了相容剂C并应用于PA6／ABS合金。考察了GMA质量分数、辐射剂量对接枝率的影响,以及相容剂C、助剂D和PA6质量分数等对合金性能的影响。通过测试结果和透射电子显微镜（TEM）照片分析表明：用辐射法合成相容剂C是成功的,能有效地提高PA6／ABS合金性能,表现出优良的增容效果。     

不同相容剂对PP/PET合金性能的影响

以乙烯-丙烯酸甲酯共聚物接枝甲基丙烯酸缩水甘油酯(EMA-g-GMA),聚烯烃弹性体接枝GMA(POE-g-GMA)和聚丙烯接枝GMA (PP-g-GMA)为相容剂,采用熔融共混法制备了PP/聚对苯二甲酸乙二醇酯(PET)合金,并对PP/PET合金的性能进行了分析;研究了不同相容剂对PP/PET合金的加工性能、力学性能和微观形貌的影响。结果表明:在添加质量分数5%相容剂的情况下,PP/PET合金加工性能都得到了明显改善,POE-g-GMA可以显著地提高合金的韧性,而PP-g-GMA则可以有效地提高合金的刚性。     

聚丙烯接枝改性及其挤出发泡研究

采用过氧化二异丙苯（DCP）为引发剂，苯乙烯（St）为助引发剂，双螺杆挤出机为反应器，使甲基丙烯酸缩水甘油酯（GMA）接技到聚丙烯（PP）链上。通过FT-IR等测试方法对接枝PP的结构和性能进行了研究，结果表明在1727cm^-1处有较为明显的羰基吸收峰；抗熔垂能力的测定表明，接枝反应有效地改善了PP的熔体强度，从而得到适于挤出发泡的聚丙烯接枝改性优化配方：PP100份、GMA8份、DCP0．06份、St3．5份。     

聚丙烯熔融挤出接枝马来酸酐的研究

研究了通过双螺杆挤出机聚丙烯熔融挤出接枝马来酸酐制马来酸酐接枝聚丙烯（PP—g—MAH）的工艺，包括单体马来酸酐（MAH）、引发剂DCP的用量及熔融反应温度和时间对聚丙烯（PP）熔融接枝MAH的接枝率的影响。结果表明：DCP、MAH的用量对PP—g—MAH接枝率影响比较明显，其最佳配比为DCP0．15份、MAH2份；最佳工艺条件为挤出螺杆转速40r／min，反应温度195-200℃。     

PP/PA6/EPDM-g-GMA合金性能的研究

在聚丙烯（PP）中加入10％～40％（质量分数）的PA6及反应增容剂EPDM—g—GMA对PP进行共混改性．观察和分析了共混合金的形貌及等温结晶形态，测试了合金的力学性能。结果表明：PP／PA6体系中加入EPDM—g—GMA后相容性改善；PP球晶尺寸随PA6的混入而减小，且PA6结晶相分布PP晶区内和PP晶区之问，加入EPDM—g—GMA后PA6结晶相尺寸减小；PP／队6体系中加入EPDM—g—GMA可起到反应增容和橡胶增韧的协同效应，使材料的韧性比纯PP明显提高；PP／PA6体系的杨氏模量高于PP，加入EPDM-g-GMA后杨氏模量比未增容体系提高不显著；PP／PA6体系的屈服强度随PA6用量的增加而下降，加入EPDM—g-GMA后屈服强度高于未增容体系但略低于PP。     

DAP存在下GMA熔融接枝聚丙烯的研究

在熔融状态下,将甲基丙烯酸缩水甘油酯(GMA)接枝到聚丙烯(PP)上,考察了共单体邻苯二甲酸二烯丙酯(DAP)、过氧化二异丙苯(DCP)用量、DAP/GMA物质的量比、混合单体用量、反应温度、密炼机转速对接枝反应的影响。结果表明:加入适量的DAP,有利于提高GMA相对接枝率,同时能有效抑制接枝过程中PP的降解;当DAP/GMA物质的量比大于0.4时,GMA相对接枝率提高不明显;最佳接枝条件为PP 100g,DCP 0.2g,混合单体(DAP/GMA物质的量比为0.4)10g,温度180℃,转速120r/min,混炼时间8 min。     

多功能单体对反应共混PP／PS合金的影响

研究了在聚现烯／聚苯乙烯／过氧化二异丙苯（ＰＰ／ＰＳ／ＤＣＰ）反应挤出共混过程中,不同分子结构的多功能单体添加剂对共混物降解的抑制及增容作用的影响。研究发现,多功能单体所含的双键越是靠近分子末端,分子链越长,结构越简单,增容效果越好;若多功能单体分子中含有一定含量的碳－碳双键,则能很好地抑制降解。     

PP／AS／DCP反应共混中SEBS的添加效应

研究了在聚丙烯（ＰＰ）／丙烯腈－苯乙烯共聚物（ＡＳ）／过氧化二异丙苯（ＤＣＰ）共混物反应挤出过程中添加热塑弹性体氢化（苯乙烯－丁二烯－苯乙烯共聚物）（ＳＥＢＳ）对ＰＰ／ＡＳ共混物降解的抑制效果对接枝反应的促进作用。对反应经物中ＰＰ相ＭＦＲ、红外测试及扫描电子显微镜与航向电子显微镜对共混物的观察结果表明,加入ＳＥＢＳ不但可以抑制反应共混中ＰＰ和ＡＳ的降解,而且可以大大促进反应共混中的接枝反应的进行,     

Effect of the type of nylon chain‐end on the compatibilization of PP/PP‐GMA/nylon 6 blends

Polyamide and polypropylene (PP) are two important classes of commercial polymers; however, their direct mixing leads to incompatible blends with poor properties. Polypropylene functionalized with glycidyl methacrylate (PP‐GMA) was used as a compatibilizer in blends of PP and nylon 6, because of the possible reaction of ? NH₂ and ? COOH groups with the epoxide group of GMA. Two types of nylon 6 with different ratios between ? NH₂ and ? COOH groups were used. The one with higher concentration of ? COOH groups was less compatible with PP in a binary blend. When PP‐GMA was used as a compatibilizer, a better dispersion of nylon in the PP matrix was obtained together with better mechanical properties for both nylons used in this work. © 2001 Society of Chemical Industry     

PP熔融接枝MAH的研究

以PP（EPS30R）为基体树脂,过氧化二异丙苯DCP为引发剂,在反应体系中加入少量的DMF（N,N-二甲基甲酰胺）,在双螺杆挤出机中于175℃-190℃进行了PP熔融接枝MAH的反应。用红外光谱表征了接枝反应的存在,并考察了引发剂用量、N,N-二甲基甲酰胺（DMF）的用量、单体用量对接枝反应的影响。研究表明：DMF能抑制PP的降解,并且确定了较佳的原料配比为m（PP）：in（MAH）：m（DMF）：In（DCP）：100：3：0．6：0．4,其接枝率可达2．95％。     

丙烯酸改性水滑石接枝PP的制备工艺

采用单一变量法研究了化学参数(接枝单体用量、引发剂用量)和加工参数(螺杆转速、螺杆温度)对丙烯酸改性水滑石(AA-LDH)和聚丙烯(PP)接枝反应的影响。结果表明,通过FTIR谱图证实了丙烯酸接枝到PP上。随着AA-LDH含量的增加,接枝物的接枝率呈现先增大后减小的趋势,在AA-LDH用量为5.0 g时,接枝率有最大值,为1.45%;接枝物的拉伸强度和弯曲强度随着AA-LDH用量的增加逐渐减小,而冲击强度却随着AA-LDH用量的增加而逐渐增大。改变引发剂过氧化二异丙苯(DCP)用量、螺杆温度和螺杆转速,接枝物的力学性能的变化规律和接枝率的变化规律相似,都是呈现先增大后减小的趋势。综合分析得到制备AA-LDH接枝PP的最佳工艺条件为:PP用量为100 g时,AA-LDH用量为5.0 g,DCP用量为0.2 g,螺杆温度为190℃,螺杆转速为300 r/min。     

Compatibilization of PP/SEBS-MAH blends by grafting Glycidyl Methacrylate onto Polypropylene

Summary In this paper, the glycidyl methacrylate(GMA) was grafted to Polypropylene(PP) macromolecular backbone by melt radical grafting. The grafted PP-g-GMA was used to compatibilize PP/SEBS-g-MAH blend in a Haake apparatus. The result of Fourier Transform Infrared(FTIR) spectrum showed that the GMA had been grafted to PP. And the reaction between epoxy groups in the GMA and MAH groups in SEBS-g-MAH had taken place. The result of torque test showed that the torque values of the compatibilized blends were higher than that of the uncompatibilized blends. The observation of Scanning Electron Microscopy (SEM) showed that the dispersed phase domain size of compatibilized blends decreased evidently than uncompatibilized blends. When the content of SEBS-g-MAH was 16 wt % and the PP-g-GMA was 2 wt % in the blend, the rubber particle size had a minimum value. Those indicated that the PP-g-GMA could compatibilize PP/ SEBS-g-MAH blends effectively. Notched Izod impact tests showed the addition of PP-g-GMA in the PP/SEBS-g-MAH blends induced a remarkable improvement of toughness and yielded a tougher PP blends.     

Preparation of epoxy functionalized PP with unique structure and its post‐ring open reaction

This article discusses a convenient chemical approach named in situ chlorination graft copolymerization (ISCGC) to prepare epoxy functionalized isotactic polypropylene (iPP) with a unique structure. This method was carried out in the gas‐solid state, and chlorine was used as radical initiator as well as terminate agent. The effect of influence factors on the structure of the functionalized PP was investigated, and it was determined by levels of grafted GMA moieties. The results showed that PP modified with GMA could obtain higher grafting level. Crystallinity and mechanical properties of the functionalized PP were also investigated. For the purpose of researching the reactivity of epoxy groups located at the grafted side chains, trichloroacetic acid and hydroxyl‐terminated butadiene–acrylonitrile rubber (HTBN) were used as models to explore the ring open reaction of the epoxy groups of the functionalized PP. The structure and property of the modified PP that has undergone post‐ring open reaction was characterized by FTIR, dynamic property analysis. The results indicated that epoxy groups of the graft side chains have successfully undergone ring open reaction in the presence of carbonyl and hydroxyl groups. Additionally, the compatibilization of PP with HTBN is enhanced after PP was modified by GMA. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

PP/LDPE化学交联发泡的研究

聚丙烯(PP)熔融黏度较低,发泡过程中气泡容易从熔体中溢出。在PP中加入低密度聚乙烯(LDPE)和偶氮二异丙苯(DCP),提高PP交联度,从而大大提高PP的熔融黏度。研究了共混聚合物组分的种类和含量对PP交联度的影响。结果表明,在共混过程中,部分PP和LDPE分子在热作用下相互促进,产生了接枝交联;共混物比纯PP的泡孔结构优且发泡效果佳,当LDPE为70%,发泡剂为5%,DCP为0.36%时,PP的发泡效果最好。解决了PP发泡过程中出现的气孔塌陷现象。