A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifie...A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifier(TPE/WBG-2/CaCO_(3)).The effects of differentβ-nucleating agents and ternary compound modifier on the mechanical properties and crystallization behavior of PPR were analyzed.The results show that,compared with pure PPR materials,both WBG-2 and TMB-5 could significantly improve the impact strength of PPR.The crystallization temperature of PPR increased with the addition ofβ-nucleating agent.The modified PPR prepared with ternary compound modifier showed the most excellent comprehensive properties.展开更多
采用差示扫描量热仪、广角X射线衍射仪、扫描电子显微镜,从微观角度探讨退火对无规共聚聚丙烯(Polypropylene Random Copolymer,PPR)管材结晶行为和抗低温冲击性能的影响。结果表明,退火能够有效地提高PPR管材低温下抗冲击性能,在-18℃...采用差示扫描量热仪、广角X射线衍射仪、扫描电子显微镜,从微观角度探讨退火对无规共聚聚丙烯(Polypropylene Random Copolymer,PPR)管材结晶行为和抗低温冲击性能的影响。结果表明,退火能够有效地提高PPR管材低温下抗冲击性能,在-18℃环境下进行落锤冲击实验,退火后PPR管材的破损比由90%减少至50%。退火不仅可以促进PPR管材内分子链重新排列、提高其规整性、消除PPR管材的热应力,还可以提高PPR管材的结晶度、诱导内部β晶的生成,从而提高其抗冲击韧性。展开更多
无规共聚聚丙烯(PPR)管材作为一种新型绿色建筑材料,被广泛应用在民用建筑和工业给排水设施等方面,但由于PPR耐热性和耐低温冲击性能较差,限制了应用,因此提高PPR的韧性尤其是低温韧性成为研究的重点。以PPR为基体,通过挤出机造粒、注...无规共聚聚丙烯(PPR)管材作为一种新型绿色建筑材料,被广泛应用在民用建筑和工业给排水设施等方面,但由于PPR耐热性和耐低温冲击性能较差,限制了应用,因此提高PPR的韧性尤其是低温韧性成为研究的重点。以PPR为基体,通过挤出机造粒、注塑机成型等手段与聚烯烃弹性体POE、聚苯乙烯弹性体TPE两种不同的增韧剂共混并进行研究,分析了不同配方对二元共混体系的拉伸强度、断裂伸长率、缺口冲击韧性以及低温冲击性能的影响;通过DSC、XRD、冲击试验机等仪器设备研究PPR复合材料的熔融结晶性能和力学性能。根据研究结果,得到耐低温抗冲击性能较为理想的PPR复合材料最优增韧方法。结果表明:随着弹性体TPE、POE用量的增加,在室温、0、-15和-25℃时共混体系的缺口冲击强度都有所增强。与POE相比较,弹性体TPE对PPR的增韧作用尤为明显,TPE填量为15%时,PPR/TPE共混料的冲击韧性最理想,体系的断裂伸长率增幅更大,其综合力学性能最好,改性材料常温冲击强度较纯PPR提高82.5%,低温0、-15、-25℃冲击强度分别增加9.25、9.13、8.53 k J/m^2,断裂伸长率由279.62%增加到584.53%,而拉伸强度仅仅降低3.43 MPa。展开更多
基金Funded by the Natural Science Foundation of Liaoning Province of China(No.20180550432)Natural Science Foundation for Young Doctoral Research(No.2020-BS-158)Basic Scientific Research Project of Colleges and Universities of Liaoning Provincial Department of Education(No.LJKQZ2021060)。
文摘A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifier(TPE/WBG-2/CaCO_(3)).The effects of differentβ-nucleating agents and ternary compound modifier on the mechanical properties and crystallization behavior of PPR were analyzed.The results show that,compared with pure PPR materials,both WBG-2 and TMB-5 could significantly improve the impact strength of PPR.The crystallization temperature of PPR increased with the addition ofβ-nucleating agent.The modified PPR prepared with ternary compound modifier showed the most excellent comprehensive properties.
文摘采用差示扫描量热仪、广角X射线衍射仪、扫描电子显微镜,从微观角度探讨退火对无规共聚聚丙烯(Polypropylene Random Copolymer,PPR)管材结晶行为和抗低温冲击性能的影响。结果表明,退火能够有效地提高PPR管材低温下抗冲击性能,在-18℃环境下进行落锤冲击实验,退火后PPR管材的破损比由90%减少至50%。退火不仅可以促进PPR管材内分子链重新排列、提高其规整性、消除PPR管材的热应力,还可以提高PPR管材的结晶度、诱导内部β晶的生成,从而提高其抗冲击韧性。
文摘无规共聚聚丙烯(PPR)管材作为一种新型绿色建筑材料,被广泛应用在民用建筑和工业给排水设施等方面,但由于PPR耐热性和耐低温冲击性能较差,限制了应用,因此提高PPR的韧性尤其是低温韧性成为研究的重点。以PPR为基体,通过挤出机造粒、注塑机成型等手段与聚烯烃弹性体POE、聚苯乙烯弹性体TPE两种不同的增韧剂共混并进行研究,分析了不同配方对二元共混体系的拉伸强度、断裂伸长率、缺口冲击韧性以及低温冲击性能的影响;通过DSC、XRD、冲击试验机等仪器设备研究PPR复合材料的熔融结晶性能和力学性能。根据研究结果,得到耐低温抗冲击性能较为理想的PPR复合材料最优增韧方法。结果表明:随着弹性体TPE、POE用量的增加,在室温、0、-15和-25℃时共混体系的缺口冲击强度都有所增强。与POE相比较,弹性体TPE对PPR的增韧作用尤为明显,TPE填量为15%时,PPR/TPE共混料的冲击韧性最理想,体系的断裂伸长率增幅更大,其综合力学性能最好,改性材料常温冲击强度较纯PPR提高82.5%,低温0、-15、-25℃冲击强度分别增加9.25、9.13、8.53 k J/m^2,断裂伸长率由279.62%增加到584.53%,而拉伸强度仅仅降低3.43 MPa。
