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Direct Synthesis of Polar-Functionalized Linear Low-Density Polyethylene (LLDPE) and Low-Density Polyethylene (LDPE)
Macromolecules ( IF 5.1 ) Pub Date : 2018-05-17 00:00:00 , DOI: 10.1021/acs.macromol.8b00467
Yinna Na 1 , Shengyu Dai 1 , Changle Chen 1
Affiliation  

Late-transition-metal catalysts have great potentials to incorporate polar comonomers during olefin polymerization. The preparation of polar-functionalized polyolefins with different microstructures and topologies is a highly fascinating concept. In this contribution, we demonstrate this possibility through palladium-catalyzed ethylene copolymerizations with polar-functionalized α-olefins and their terpolymerizations with α-olefins. A phosphine–sulfonate–palladium catalyst (PO-Pd) afforded highly linear polyethylene during ethylene homopolymerization. Linear low-density polyethylene (LLDPE) was obtained from the PO-Pd-catalyzed copolymerizations of ethylene with α-olefins; in these copolymerizations, the partial or complete replacement of α-olefins with polar-functionalized α-olefins led to the formation of polar-functionalized LLDPE (P-LLDPE). A specially designed α-diimine palladium catalyst (NN-Pd) afforded polyethylenes with tunable branching densities (16–37 per 1000 carbon atoms), melting points (101–113 °C), and densities (0.89–0.92 g/cm3), which closely resemble those of low-density polyethylene (LDPE). The NN-Pd-catalyzed copolymerizations of ethylene with polar α-olefins generated analogues of polar-functionalized low-density polyethylene (P-LDPE). The mechanical and surface properties of these polar polyolefin materials were studied in detail, and their properties were further improved/modified through cross-linking reactions.

中文翻译:

极性功能化线性低密度聚乙烯(LLDPE)和低密度聚乙烯(LDPE)的直接合成

后期过渡金属催化剂具有在烯烃聚合过程中掺入极性共聚单体的巨大潜力。具有不同的微观结构和拓扑结构的极性官能化聚烯烃的制备是一个非常引人入胜的概念。在这项贡献中,我们通过钯催化的乙烯与极性官能化的α-烯烃的共聚反应以及它们与α-烯烃的三元聚合反应证明了这种可能性。膦-磺酸盐-钯催化剂(PO-Pd)在乙烯均聚过程中提供了高度线性的聚乙烯。线性低密度聚乙烯(LLDPE)由PO-Pd获得乙烯与α-烯烃的催化共聚;在这些共聚中,用极性官能化的α-烯烃部分或完全替代α-烯烃导致极性官能化的LLDPE(P-LLDPE)的形成。专门设计的α-二亚胺钯催化剂(NN-Pd)提供了具有可调支化密度(每1000个碳原子16-37),熔点(101-113°C)和密度(0.89-0.92 g / cm 3)的聚乙烯。,与低密度聚乙烯(LDPE)的相似。该NN-钯乙烯与极性α-烯烃的催化共聚反应生成了极性官能化低密度聚乙烯(P-LDPE)的类似物。对这些极性聚烯烃材料的机械和表面性能进行了详细研究,并通过交联反应进一步改善/改性了它们的性能。
更新日期:2018-05-17
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