润物无声，启迪创新——从“冷冻聚合制备高分子量聚合物”综合实验谈起

doi:10.3866/PKU.DXHX202102009

Abstract

Abstract:

Cryo-polymerization is a newly developed polymerization technique. Its polymerization temperature is below the freezing point of the medium and the polymerization locus is indeed the liquid microphase (about 10%, volume percent) embedded in the frozen bulk. Due to the low polymerization temperature as well as the highly concentrated monomer in the polymerization locus, cryo-polymerization facilitates the preparation of (ultra) high molecular weight polymers. In this experiment, the cryo-polymerization of acrylamide and acrylic acid is performed separately, the molecular weight of the obtained polymer is modulated by varying polymerization parameters and determined by the dilute solution viscometry method. This experiment can prompt students to grasp the primary principle to control molecular weight of radical polymerization, utilize Mayo equation flexibility and learn some laboratory skills through watching out the experimental details, leading to acquisition of the ability to design experiment.

Key words: Comprehensive experiment, Cryo-polymerization, Molecular weight control, Ultra-high molecular weight, Polyacrylamide, Poly(acrylic acid)

Bangkun Jin, Weidong He. Teaching and Learning of a Comprehensive Experiment on Synthesis of Ultrahigh Molecular Weight Polymers through Cryo-Polymerization[J].University Chemistry, 2021, 36(12): 2102009.

Figures/Tables 4

References 14

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实验序号	AM/g	溶解单体的水/mL	APS溶液/mL ^a	TMEDA溶液/mL ^b	补加水/mL ^c	聚合温度
1	5.00	4.00
2	5.00	4.00
3	5.00	4.00
4	5.00	4.00
5	5.00	4.00

实验序号	AM/g ^a	蒸馏水/mL	APS/mg ^b	TMEDA/mg ^b
1	0.53 (1.49)	5.00	1.15 (1.00)	1.15 (1.98)
2	0.53 (1.49)	5.00	1.55 (1.35)	1.55 (2.67)
3	0.53 (1.49)	5.00	2.30 (2.00)	2.30 (3.96)
4	0.53 (1.49)	5.00	3.45 (3.00)	3.45 (5.94)
5	0.53 (1.49)	5.00	4.60 (4.00)	4.60 (7.92)

实验序号	AA/mL ^a	蒸馏水/mL	PPS/mg ^b	抗坏血酸/mg ^b
1	1.00 (4.91)	2.00	0.58 (0.71)	0.58 (1.01)
2	1.00 (4.91)	2.00	1.15 (1.42)	1.15 (2.18)
3	1.00 (4.91)	2.00	1.72 (2.13)	1.72 (3.26)
4	1.00 (4.91)	2.00	2.30 (2.84)	2.30 (4.35)
5	1.00 (4.91)	2.00	2.88 (3.54)	2.88 (5.44)

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Teaching and Learning of a Comprehensive Experiment on Synthesis of Ultrahigh Molecular Weight Polymers through Cryo-Polymerization

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