CO2响应性L-脯氨酸基纳米反应器的构筑及其催化性能

doi:10.16085/j.issn.1000-6613.2022-0154

摘要/Abstract

摘要：

采用可逆加成-断裂链转移（RAFT）分散聚合法制备了一系列固载L-脯氨酸、CO₂响应性结构单元甲基丙烯酸二乙氨基乙酯（DEA）含量不同的mPEG₂₂-b-P[BnMA _x -co-L-ProlA _n ]-b-PDEA _y PBL-b-PD-(DEA) _m （m=0,1,2,3）和单体序列结构不同的mPEG₂₂-b-P(L-ProlA)-b-P[BnMA-co-DEA] （PL-b-PBD）聚合物。利用核磁共振氢谱（¹H NMR）、X射线光电子能谱（XPS）和凝胶渗透色谱（GPC）对聚合物的化学结构及相对分子量分布进行了表征。采用动态光散射（DLS）对聚合物的自组装行为及形成纳米反应器后的CO₂响应性进行了研究。同时，结合耗散粒子动力学（DPD）模拟探究了聚合物亲疏水单体比例和序列结构对聚合物自组装结构的影响。最后，将制备的纳米反应器用于水相催化直接不对称Aldol反应，结果表明，PBL-b-PD-(DEA)₂具有最佳的催化性能[96%conv.，93/7(anti/syn)，94%ee]。该研究为探究聚合物自组装结构对其催化性能的影响提供了新思路。

关键词: L-脯氨酸, CO₂响应性, 纳米反应器, Aldol反应, 自组装

Abstract:

A series of copolymers of mPEG₂₂-b-P[BnMA _x -co-L-ProlA _n ]-b-PDEA _y PBL-b-PD-(DEA) _m (m=0,1,2,3) with different content of CO₂-responsiveness diethylaminoethyl methacrylate (DEA) and mPEG₂₂-b-P(L-ProlA)-b-P[BnMA-co-PDEA] (PL-b-PBD) with different sequence structure were fabricated by reversible addition fragmentation chain transfer (RAFT) dispersion polymerization. The chemical structure and molecular weight distribution of the copolymers were carried out by ¹H nuclear magnetic resonance spectra (¹H ‍NMR spectra), X-ray photoelectron spectroscopy (XPS) and gel permeation chromatography (GPC). Dynamic light scattering (DLS) was used to investigate the self-assembly behavior of the copolymers and the CO₂-responsiveness of the nanoreactors. Moreover, dissipative particle dynamics (DPD) studies showed that the self-assemble structure of nanoreactors could be turned by controlling the monomer contents distribution and sequence structure of hydrophilic and hydrophobic. Finally, the nanoreactors were used to catalyze asymmetric Aldol reaction of cyclohexanone and 4-nitrobenzaldehyde in water. The results indicated that PBL-b-PD-(DEA)₂ gave the Aldol product with high conv., anti/syn and ee (96%, 97/3, 94%). This study provided a promising approach for exploring the self-assembly structure of copolymers on its catalytic performance.

Key words: L-proline, CO₂-responsiveness, nanoreactors, Aldol reaction, self-assembly

中图分类号:

O621.3

靳雯, 陈小丽, 唐娱, 李茹玉, 申迎华, 张凯. CO₂响应性L-脯氨酸基纳米反应器的构筑及其催化性能[J]. 化工进展, 2022, 41(11): 5996-6002.

JIN Wen, CHEN Xiaoli, TANG Yu, LI Ruyu, SHEN Yinghua, ZHANG Kai. Construction and catalytic performance of CO₂ responsive nanoreactors containing L-proline moieties[J]. Chemical Industry and Engineering Progress, 2022, 41(11): 5996-6002.

图/表 9

参考文献 19

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样品	DP_BnMA	DP_DEA	DP_ProlA	M_n^①/kDa	PDI^②
PBL-b-PD-(DEA)₀	168	0	5	31.86	1.14
PBL-b-PD-(DEA)₁	160	22	5	35.00	1.23
PBL-b-PD-(DEA)₂	160	85	5	46.66	1.21
PBL-b-PD-(DEA)₃	160	99	5	48.70	1.24
PL-b-PBD	164	84	4	46.89	1.06

样品	DP_BnMA	DP_DEA	DP_ProlA	M_n^①/kDa	PDI^②
PBL-b-PD-(DEA)₀	168	0	5	31.86	1.14
PBL-b-PD-(DEA)₁	160	22	5	35.00	1.23
PBL-b-PD-(DEA)₂	160	85	5	46.66	1.21
PBL-b-PD-(DEA)₃	160	99	5	48.70	1.24
PL-b-PBD	164	84	4	46.89	1.06

样品	粒径/nm
样品	乙醇∶水=80∶20（体积比）	CO₂水溶液	去离子水
PBL-b-PD-(DEA)₀	317.3	—	25.6
PBL-b-PD-(DEA)₁	358.2	98.32	37.5
PBL-b-PD-(DEA)₂	412.0	144.3	42.7
PBL-b-PD-(DEA)₃	447.9	173.3	60.9
PL-b-PBD	400.1	148.2	45.3

样品	粒径/nm
样品	乙醇∶水=80∶20（体积比）	CO₂水溶液	去离子水
PBL-b-PD-(DEA)₀	317.3	—	25.6
PBL-b-PD-(DEA)₁	358.2	98.32	37.5
PBL-b-PD-(DEA)₂	412.0	144.3	42.7
PBL-b-PD-(DEA)₃	447.9	173.3	60.9
PL-b-PBD	400.1	148.2	45.3


催化剂	conv.^①/%	anti/syn^①	ee^②/%
4-羟基-L-脯氨酸	9	61/39	n.d.^④
PL-b-PBD	88	75/25	79
PBL-b-PD-(DEA)₀	31	69/31	n.d.^④
PBL-b-PD-(DEA)₁	78	73/27	80
PBL-b-PD-(DEA)₂^③	37	78/22	83
PBL-b-PD-(DEA)₂	96	93/7	94
PBL-b-PD-(DEA)₃	94	92/8	95

CO₂响应性L-脯氨酸基纳米反应器的构筑及其催化性能

Construction and catalytic performance of CO₂ responsive nanoreactors containing L-proline moieties

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