Synthesis and Properties of Imidazolium-based Polyethylene Ionomer

doi:10.7503/cjcu20200322

Abstract

Abstract:

The novel ethylene/5-iodomethyl norbornene(IMNB) copolymers with high molecular weight, narrow molecular weight distribution and different incorporation of comonomer were firstly synthesized by using titanium catalysts bearing two β-ketiminato chelate ligands, then iodine atoms distributed randomly along the copolymer chains were subsequently converted into ionic groups via nucleophilic substitution reaction with N-methylimidazole, followed by exchanging the I^- counteranions with CH₃SO₃^-, CF₃SO₃^-, or Tf₂N^-. Thus, a series of imidazolium-based polyethylene ionomers bearing different counteranions were readily obtained. As observed, the introduction of ionic groups destroyed the crystallization of copolymers, contribu-ting to the decrease of melting temperature and crystallinity. Such effect became more significant with increasing the ion content. Ionomers had higher glass transition temperature(T_g) than that of ethylene/IMNB copolymer, suggesting the interaction between ionic groups restricted the mobility of surrounding segments. Compared with copolymer, polyethylene ionomers exhibited better thermal stability, hydrophilic property and tensile strength. With the same ion content, the stress-at-break values of the ionomers followed the order: CH₃SO₃^->CF₃SO₃^->Tf₂N^-, whereas the strain-at-break values in the opposite order.

Key words: Polyolefin, Ionomer, Thermal stability, Hydrophilic property, Tensile strength

CLC Number:

O631

TrendMD:

ZHANG Jun, WANG Bin, PAN Li, MA Zhe, LI Yuesheng. Synthesis and Properties of Imidazolium-based Polyethylene Ionomer[J]. Chem. J. Chinese Universities, 2020, 41(9): 2070.

Figures/Tables 8

References 35

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Polymer	n(IMNB)^b/mmol	n(Al)/n(Ti)	Yield(g)	Catalytic activity/ (kg·mol^-_T¹_i·h^-1)	Incorp. of IMNB^c	10^-4M_w^d	M_w/M_n^d	T_m^e/℃
P1	2.7	1000	3.9	780	3.6	23.9	1.7	114.3
P2	5.4	1000	3.5	700	6.9	20.3	1.6	103.4
P3	8.0	1000	4.3	860	9.1	21.2	1.6	81.2
P4	10.7	1000	4.5	900	13.7	20.6	1.4	71.1
P5	13.4	1000	3.8	760	15.6	21.2	1.4	60.3
P6	18.7	1000	4.6	920	19.3	19.4	1.7	—
P7	8.0	500	3.1	620	11.5	19.6	1.6	76.1
P8	8.0	1500	4.2	840	8.6	22.2	1.5	95.6

Polymer	n(IMNB)^b/mmol	n(Al)/n(Ti)	Yield(g)	Catalytic activity/ (kg·mol^-_T¹_i·h^-1)	Incorp. of IMNB^c	10^-4M_w^d	M_w/M_n^d	T_m^e/℃
P1	2.7	1000	3.9	780	3.6	23.9	1.7	114.3
P2	5.4	1000	3.5	700	6.9	20.3	1.6	103.4
P3	8.0	1000	4.3	860	9.1	21.2	1.6	81.2
P4	10.7	1000	4.5	900	13.7	20.6	1.4	71.1
P5	13.4	1000	3.8	760	15.6	21.2	1.4	60.3
P6	18.7	1000	4.6	920	19.3	19.4	1.7	—
P7	8.0	500	3.1	620	11.5	19.6	1.6	76.1
P8	8.0	1500	4.2	840	8.6	22.2	1.5	95.6

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