Preparation of P2VP-b-PSt nano-objects via visible light-mediated polymerization-induced self-assembly at room temperature

doi:10.16085/j.issn.1000-6613.2020-1131

Abstract

Abstract:

The application of styrene (St) in the polymerization-induced self-assembly (PISA) at room temperature has been limited by the slow polymerization rate of St at ambient temperature. In this work, a simple PISA approach was proposed for poly(2-vinylpyridine)-block-polystyrene (P2VP-b-PSt) using blue LED as illuminant and avoiding employment of photoinitiators or photocatalysts. By using P2VP as macromolecular chain transfer agent, St as a monomer and methanol as solvent, nano-objects of poly (2-vinylpyridine)-block-polystyrene(P2VP-b-PSt) were successfully prepared at room temperature. The effects of the molar ratio of St to P2VP, polymerization time and chain length of P2VP on the aggregate morphologies were investigated. The results showed that the morphology of aggregate was transformed from spherical micelle to vesicle when the molecular weight of P2VP was 4000, the molar ratio of St/P2VP was varied from 400/1 to 4000/1 and the polymerization time was from 3h to 24h, while only spherical micelles were obtained when the molecular weight of P2VP was 8300.

Key words: visible light, room temperature, polymerization-induced self-assembly, poly(2-vinylpyridine)-block-polystyrene(P2VP-b-PSt), morphology

摘要：

针对苯乙烯（St）的常温聚合速率缓慢影响了其在常温聚合诱导自组装（PISA）中的应用问题，提出了一种无需添加光引发剂或光催化剂，以蓝光LED为光源，聚2-乙烯基吡啶（P2VP）为大分子链转移剂，常温下在甲醇中实现St的PISA的方法。通过可见光引发的PISA制备了聚2-乙烯基吡啶-b-聚苯乙烯（P2VP-b-PSt）纳米材料，考察了St/P2VP的比例、聚合时间及P2VP的链长对聚集体形貌的影响，结果表明，当P2VP的分子量为4000、St/P2VP的摩尔比从400/1变化到4000/1、聚合时间从3h变化到24h，均可以实现聚集体从球形胶束到囊泡的转变；当P2VP的分子量为8300时，仅能得到球形胶束。

关键词: 可见光, 室温, 聚合诱导自组装, 聚2-乙烯基吡啶-b-聚苯乙烯, 形貌

CLC Number:

O631

LUO Juxiang, CHENG Deshu, LI Mingchun, XIN Meihua. Preparation of P2VP-b-PSt nano-objects via visible light-mediated polymerization-induced self-assembly at room temperature[J]. Chemical Industry and Engineering Progress, 2021, 40(5): 2676-2684.

罗菊香, 程德书, 李明春, 辛梅华. 室温可见光引发聚合诱导自组装制备P2VP-b-PSt纳米材料[J]. 化工进展, 2021, 40(5): 2676-2684.

Figures/Tables 10

References 20

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St/P2VP	聚合物纳米粒质量分数/%	粒径 /nm	粒径分布(PDI,多分散性指数)	形貌
400/1	32.2±0.586	83.8±2.14	0.122±0.006	球形胶束
800/1	21.3±0.611	109±0.737	0.127±0.005	球形胶束
1600/1	15.3±0.666	152±1.02	0.169±0.007	球形胶束
2400/1	10.0±0.361	185±5.67	0.172±0.006	球形胶束，囊泡
3200/1	7.56±0.215	197±4.54	0.166±0.005	囊泡
4000/1	5.93±0.196	192±5.11	0.197±0.009	囊泡

St/P2VP	聚合物纳米粒质量分数/%	粒径 /nm	粒径分布(PDI,多分散性指数)	形貌
400/1	32.2±0.586	83.8±2.14	0.122±0.006	球形胶束
800/1	21.3±0.611	109±0.737	0.127±0.005	球形胶束
1600/1	15.3±0.666	152±1.02	0.169±0.007	球形胶束
2400/1	10.0±0.361	185±5.67	0.172±0.006	球形胶束，囊泡
3200/1	7.56±0.215	197±4.54	0.166±0.005	囊泡
4000/1	5.93±0.196	192±5.11	0.197±0.009	囊泡

时间/h	P2VP₃₈-b-PSt_m	粒径/nm	粒径分布(PDI,多分散性指数)	形貌
3	m=113	32.6±1.44	0.025±0.002	球形胶束
6	m=173	41.4±1.46	0.023±0.001	球形胶束
9	m=204	56.1±1.23	0.065±0.004	球形/蠕虫状胶束
12	m=275	84.0±3.04	0.125±0.006	纳米线，囊泡
18	m=358	158±4.12	0.177±0.036	囊泡
24	m=519	192±5.11	0.197±0.009	囊泡

时间/h	P2VP₃₈-b-PSt_m	粒径/nm	粒径分布(PDI,多分散性指数)	形貌
3	m=113	32.6±1.44	0.025±0.002	球形胶束
6	m=173	41.4±1.46	0.023±0.001	球形胶束
9	m=204	56.1±1.23	0.065±0.004	球形/蠕虫状胶束
12	m=275	84.0±3.04	0.125±0.006	纳米线，囊泡
18	m=358	158±4.12	0.177±0.036	囊泡
24	m=519	192±5.11	0.197±0.009	囊泡

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