Functional Isotactic Polypropylenes via Efficient Direct Copolymerizations of Propylene with Various Amino-Functionalized α-Olefins

• DOI: 10.1021/acs.macromol.9b00757
• Publication Date: 2019-11-25T13:48:28Z
• Authors: Ruining Shang; Huan Gao; Faliang Luo; Yulian Li; Bin Wang; Zhe Ma; Li Pan; Yuesheng Li
• Keywords: Comonomer; Tacticity

A series of novel amino-containing isotactic polypropylenes with high molecular weight and satisfying functional comonomer incorporation were synthesized via direct copolymerization propylene α-olefin containing bulky groups protected amino. The highly efficient postmetallocene catalyst system, (pyridylamido)Hf/[Ph3C][B(C6F5)4]/AliBu3, exhibited overwhelmingly favorable reactivity toward over amino olefin moieties, effectively promoted the 5-(N,N-diisopropylamino)-1-pentene, 5-(N,N-diphenylamino)-1-pentene, 4-(7-octen-1-yl)-N,N-diphenylaniline, respectively, under mild reaction conditions, in which very catalytic activity (up to 7.44 × 106 gpolymer molCat.–1 h–1) was achieved. obtained copolymers proved exhibit 5.90 105), 11.6 mol %) tacticity ([mmmm] > 99%). Besides, most melting points thermostability (Td around 450 °C). Representative physical properties such as UV–vis absorption mechanical performances newly iPPs different tertiary amine have also been explored.