Preparation of rigid⁃group⁃bridged polysiloxanes/ethylcellulose mixed membranes for CO2 separation

doi:10.19491/j.issn.1001-9278.2024.06.008

Abstract

Abstract:

Three types of rigid⁃group⁃bridged polysiloxanes⁃modified ethylcellulose （EC） mixed membranes were prepared by using three bridged⁃polysiloxanes with different rigid groups of hexafluoroimide， naphthalimide， and fluorene as modifiers and EC as a substrate， through solution co⁃blending and coating. The three mixed membranes exhibited a good film formation ability， high mechanical properties， and good thermal stability. Compared to pure EC membrane， the three mixed membranes gained an improvement in the permeability of CO₂without sacrificing selectivity （CO₂/N₂and CO₂/CH₄）. Especially， the naphthalimide bridged⁃polysiloxanes obtained a CO₂ permeation coefficient of over 213 barrers， which is 4.9 times higher than pure EC membrane.

Key words: bridged?polysiloxanes, ethyl cellulose, mixed membrane, gas separation

CLC Number:

TQ320.72⁺1

FAN Wenxuan, XU Shuangping, JIA Hongge, ZHANG mingyu, QU Yanqing. Preparation of rigid⁃group⁃bridged polysiloxanes/ethylcellulose mixed membranes for CO₂ separation[J]. China Plastics, 2024, 38(6): 51-59.

Figures/Tables 15

References 37

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类交联聚硅氧烷质量分数/%	EC/g	6FBPMS/g	NTBPMS/g	BAFBPMS/g
5	0.90	—	0.05	—
10	0.90	0.10	0.10	0.10
20	0.90	0.23	0.23	0.23
30	0.90	0.39	0.39	0.39
40	0.90	0.60	0.60	0.60
50	0.90	0.90	—	0.90

类交联聚硅氧烷质量分数/%	EC/g	6FBPMS/g	NTBPMS/g	BAFBPMS/g
5	0.90	—	0.05	—
10	0.90	0.10	0.10	0.10
20	0.90	0.23	0.23	0.23
30	0.90	0.39	0.39	0.39
40	0.90	0.60	0.60	0.60
50	0.90	0.90	—	0.90

样品	类交联聚硅氧烷含量/%	断裂伸长率/%	拉伸强度/MPa	弹性模量/MPa
EC	—	21.6	44.5	559
6FBPMS/EC	10	6.30	38.0	603
	20	5.10	35.8	978
	30	3.56	25.7	2 227
	40	1.30	10.6	3 595
	50	1.40	5.57	4 678
NTBPMS/EC	5	18.0	40.5	43.4
	10	13.4	26.9	56.7
	20	5.50	16.6	107
	30	2.20	7.22	373
	40	1.64	6.58	645
BAFBPMS/EC	10	3.76	39.1	431
	20	2.33	37.6	611
	30	4.56	25.4	1 557
	40	0.86	12.8	2 073
	50	1.16	3.32	3 176

样品	类交联聚硅氧烷含量/%	断裂伸长率/%	拉伸强度/MPa	弹性模量/MPa
EC	—	21.6	44.5	559
6FBPMS/EC	10	6.30	38.0	603
	20	5.10	35.8	978
	30	3.56	25.7	2 227
	40	1.30	10.6	3 595
	50	1.40	5.57	4 678
NTBPMS/EC	5	18.0	40.5	43.4
	10	13.4	26.9	56.7
	20	5.50	16.6	107
	30	2.20	7.22	373
	40	1.64	6.58	645
BAFBPMS/EC	10	3.76	39.1	431
	20	2.33	37.6	611
	30	4.56	25.4	1 557
	40	0.86	12.8	2 073
	50	1.16	3.32	3 176

样品	类交联聚硅氧烷含量/%	T_d5/℃^a	T_d25/℃^a	R₆₀₀/%^b
EC	—	312	355	3.86
6FBPMS	—	266	446	22.1
6FBPMS/EC	10	306	349	9.58
	20	277	342	10.6
	30	291	345	13.4
	40	284	341	15.7
	50	288	344	18.2
NTBPMS	—	308	365	37.8
NTBPMS/EC	5	212	350	3.94
	10	288	363	13.5
	20	291	370	18.2
	30	267	358	21.1
	40	281	370	23.4
BAFBPMS	—	287	413	45.0
BAFBPMS/EC	10	274	363	8.14
	20	305	365	8.29
	30	297	367	14.8
	40	278	367	14.4
	50	250	355	17.0

Preparation of rigid⁃group⁃bridged polysiloxanes/ethylcellulose mixed membranes for CO₂ separation

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Figures/Tables 15

References 37

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样品	添加量/%	厚度/μm	P /Barrer ^a			α
样品	添加量/%	厚度/μm	CO₂	CH₄	N₂	CO₂/CH₄	CO₂/N₂
EC	—	127	43.2	5.26	2.40	8.21	18.0
6FBPMS/EC	10	47.1	117.0	11.10	6.03	10.50	19.3
	20	52.5	101.0	6.80	5.01	14.80	20.1
	30	54.2	68.1	4.24	3.32	16.10	20.5
	40	75.4	59.9	4.05	2.72	14.80	21.9
	50	75.0	39.6	2.94	1.93	13.50	20.5
NTBPMS/EC	5	60.2	116.0	10.50	5.86	11.10	19.9
	10	65.7	146.0	12.20	6.14	11.90	23.8
	20	90.4	213.0	20.30	10.20	10.50	20.9
	30	75.6	191.0	19.30	11.20	9.99	17.1
	40	79.5	119.0	12.70	9.92	9.38	12.0
BAFBPMS/EC	10	45.8	136.0	14.70	7.26	9.26	18.7
	20	43.5	106.0	11.00	5.06	9.64	20.9
	30	68.4	94.7	9.30	4.92	10.20	19.9
	40	71.2	71.5	6.51	4.29	11.00	16.7
	50	70.2	51.6	5.56	3.62	9.30	14.3

样品	添加量 /%	P/barrer ^a			S^b			D^c
样品	添加量 /%	CO₂	CH₄	N₂	CO₂	CH₄	N₂	CO₂	CH₄	N₂
EC	—	43.20	5.26	2.40	23.60	0.70	2.00	1.83	7.51	1.20
6FBPMS/EC	10	116.64	11.08	6.03	142.24	7.80	6.15	0.82	1.42	0.98
	20	100.93	6.80	5.01	101.95	3.98	4.47	0.99	1.71	1.12
	30	68.12	4.24	3.32	63.66	2.29	2.55	1.07	1.85	1.30
	40	59.78	4.05	2.72	29.02	1.13	1.09	2.06	3.59	2.49
	50	39.59	2.94	1.93	11.06	0.66	0.54	3.58	4.44	3.52
NTBPMS/EC	5	116.36	10.50	5.86	168.64	6.60	6.30	0.69	1.59	0.93
	10	145.91	12.22	6.14	180.14	6.64	5.53	0.81	1.84	1.11
	20	212.69	20.26	10.19	136.34	7.76	4.67	1.56	2.61	2.18
	30	191.19	19.31	11.20	177.03	6.46	7.83	1.08	2.99	1.43
	40	119.10	12.69	9.92	130.88	4.47	9.63	0.91	2.84	1.03
BAFBPMS/EC	10	136.16	14.70	7.26	82.52	31.96	18.62	1.65	0.46	0.39
	20	105.61	10.96	5.06	108.88	19.57	9.92	0.97	0.56	0.51
	30	94.73	9.30	4.92	34.96	5.60	3.76	2.71	1.66	1.31
	40	71.49	6.51	4.29	18.28	2.52	2.63	3.91	2.58	1.63
	50	51.75	5.56	3.62	1.66	0.32	1.73	31.07	17.33	2.09

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