Home

Citation: Hong Zheng, Xin Peng, Chunwang Yi. The Tale of Caprolactam Cyclic Oligomers: The Ever-changing Life of “Princess Cyclo”[J]. University Chemistry, ;2024, 39(9): 40-47. doi: 10.12461/PKU.DXHX202403058 shu

The Tale of Caprolactam Cyclic Oligomers: The Ever-changing Life of “Princess Cyclo”

College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410000, China

Received Date: 18 March 2024
Revised Date: 16 April 2024

During the hydrolysis process of caprolactam to produce polyamide 6, a considerable number of cyclic oligomers are inevitably formed. Among these, the cyclic dimer, with its propensity for aggregation, poses significant challenges to both process safety and product quality. Thus, understanding the characteristics of cyclic oligomers is crucial for ensuring process safety and enhancing product quality. This paper employs a personification approach to vividly describe the properties of cyclic oligomers, elucidating the formation mechanism of cyclic dimers, delineating the behavior of crystal phase transitions, and highlighting the detrimental effects of cyclic dimers on industrial production. Moreover, it proposes methods for process optimization.
- Caprolactam cyclic oligomer,
- Cyclic dimer,
- Crystal phase transformation,
- Performance,
- Industrial impact
1. [1]
2. [2]
  Fantoni, R. F. Polyamide 6-Basic Chemistry of Caprolactam Polymerization; Noyvallesina Engineering Ed.: Parre (BG), Italy, 1990; pp. 14–20.
3. [3]
4. [4]
  Peng, L.; Li, J.; Peng, S. M.; Yi, C. W.; Jiang, F. Roy. Soc. Open Sci. 2018, 5 (11), 1.
5. [5]
6. [6]
  Nuyken, O.; Pask, S. Polymers 2013, 5 (2), 361.
7. [7]
  Yi, C. W.; Yang, C.; Li, J.; Chen, J.; Zhang, S.; Sun, H. Process Saf. Environ. 2020, 136, 56.
8. [8]
9. [9]
  Hoppe, M.; de Voogt, P.; Franz, R. Trends Food Sci. Tech. 2016, 50, 118.
10. [10]
11. [11]
  Qin, C. X.; Tang, J.; Bi, F. L.; Xi, Z. H.; Zhao, L. Chin. J. Chem. Eng. 2018, 26 (5), 1022.
12. [12]
  Chen, J. Y.; Li, Z.; Jin, L. Z.; Ni, P.; Liu, G. Y.; He, H.; Zang, J. Q.; Dong, J. P.; Ruan, R. Y. J. Mater. Cycles Waste Manage. 2010, 12, 321.
13. [13]
  Qin, C. X.; Lin, C.; Tang, J.; Xi, Z. H.; Zhao, L. Can. J. Chem. Eng. 2017, 96 (3), 739.
14. [14]
15. [15]
16. [16]
  Gong, C. H.; Gu, Y.; Wang, X.; Yi, C. W. Macromolecules 2022, 55 (13), 5342.
1. [1]
  Min LIU , Huapeng RUAN , Zhongtao FENG , Xue DONG , Haiyan CUI , Xinping WANG . Neutral boron-containing radical dimers. Chinese Journal of Inorganic Chemistry, 2025, 41(1): 123-130. doi: 10.11862/CJIC.20240362
2. [2]
  Ji Qi , Jianan Zhu , Yanxu Zhang , Jiahao Yang , Chunting Zhang . Visible Color Change of Copper (II) Complexes in Reversible SCSC Transformation: The Effect of Structure on Color. University Chemistry, 2024, 39(3): 43-57. doi: 10.3866/PKU.DXHX202307050
3. [3]
  Jiaxin Su , Jiaqi Zhang , Shuming Chai , Yankun Wang , Sibo Wang , Yuanxing Fang . Optimizing Poly(heptazine imide) Photoanodes Using Binary Molten Salt Synthesis for Water Oxidation Reaction. Acta Physico-Chimica Sinica, 2024, 40(12): 2408012-0. doi: 10.3866/PKU.WHXB202408012
4. [4]
  Huafeng SHI . Construction of MnCoNi layered double hydroxide@Co-Ni-S amorphous hollow polyhedron composite with excellent electrocatalytic oxygen evolution performance. Chinese Journal of Inorganic Chemistry, 2025, 41(7): 1380-1386. doi: 10.11862/CJIC.20240378
5. [5]
  Jianquan Liu , Xiangshan Wang . Teaching Design and Practice of Naming Rules for Circular Isomer Configuration under the Guidance of Information Literacy. University Chemistry, 2025, 40(7): 352-358. doi: 10.12461/PKU.DXHX202409082
6. [6]
  Huirong BAO , Jun YANG , Xiaomiao FENG . Preparation and electrochemical properties of NiCoP/polypyrrole/carbon cloth by electrodeposition. Chinese Journal of Inorganic Chemistry, 2025, 41(6): 1083-1093. doi: 10.11862/CJIC.20250008
7. [7]
  Xin Han , Zhihao Cheng , Jinfeng Zhang , Jie Liu , Cheng Zhong , Wenbin Hu . Design of Amorphous High-Entropy FeCoCrMnBS (Oxy) Hydroxides for Boosting Oxygen Evolution Reaction. Acta Physico-Chimica Sinica, 2025, 41(4): 2404023-0. doi: 10.3866/PKU.WHXB202404023
8. [8]
  Zhiwen HU , Ping LI , Yulong YANG , Weixia DONG , Qifu BAO . Morphology effects on the piezocatalytic performance of BaTiO₃. Chinese Journal of Inorganic Chemistry, 2025, 41(2): 339-348. doi: 10.11862/CJIC.20240172
9. [9]
  Weihan Zhang , Menglu Wang , Ankang Jia , Wei Deng , Shuxing Bai . Surface Sulfur Species Influence Hydrogenation Performance of Palladium-Sulfur Nanosheets. Acta Physico-Chimica Sinica, 2024, 40(11): 2309043-0. doi: 10.3866/PKU.WHXB202309043
10. [10]
  Zongfei YANG , Xiaosen ZHAO , Jing LI , Wenchang ZHUANG . Research advances in heteropolyoxoniobates. Chinese Journal of Inorganic Chemistry, 2024, 40(3): 465-480. doi: 10.11862/CJIC.20230306
11. [11]
  Jiaming Xu , Yu Xiang , Weisheng Lin , Zhiwei Miao . Research Progress in the Synthesis of Cyclic Organic Compounds Using Bimetallic Relay Catalytic Strategies. University Chemistry, 2024, 39(3): 239-257. doi: 10.3866/PKU.DXHX202309093
12. [12]
  Zhihuan XU , Qing KANG , Yuzhen LONG , Qian YUAN , Cidong LIU , Xin LI , Genghuai TANG , Yuqing LIAO . Effect of graphene oxide concentration on the electrochemical properties of reduced graphene oxide/ZnS. Chinese Journal of Inorganic Chemistry, 2024, 40(7): 1329-1336. doi: 10.11862/CJIC.20230447
13. [13]
  Jiahe LIU , Gan TANG , Kai CHEN , Mingda ZHANG . Effect of low-temperature electrolyte additives on low-temperature performance of lithium cobaltate batteries. Chinese Journal of Inorganic Chemistry, 2025, 41(4): 719-728. doi: 10.11862/CJIC.20250023
14. [14]
  Rui Yang , Hui Li , Qingfei Meng , Wenjie Li , Jiliang Wu , Yongjin Fang , Chi Huang , Yuliang Cao . Influence of PC-based Electrolyte on High-Rate Performance in Li/CrO_x Primary Battery. Acta Physico-Chimica Sinica, 2024, 40(9): 2308053-0. doi: 10.3866/PKU.WHXB202308053
15. [15]
  Chengqian Mao , Yanghan Chen , Haotong Bai , Junru Huang , Junpeng Zhuang . Photodimerization of Styrylpyridinium Salt and Its Application in Silk Screen Printing. University Chemistry, 2024, 39(5): 354-362. doi: 10.3866/PKU.DXHX202312014
16. [16]
  Tieping CAO , Yuejun LI , Dawei SUN . Surface plasmon resonance effect enhanced photocatalytic CO₂ reduction performance of S-scheme Bi₂S₃/TiO₂ heterojunction. Chinese Journal of Inorganic Chemistry, 2025, 41(5): 903-912. doi: 10.11862/CJIC.20240366
17. [17]
  Yuanchao LI , Weifeng HUANG , Pengchao LIANG , Zifang ZHAO , Baoyan XING , Dongliang YAN , Li YANG , Songlin WANG . Effect of heterogeneous dual carbon sources on electrochemical properties of LiMn_0.8Fe_0.2PO₄/C composites. Chinese Journal of Inorganic Chemistry, 2024, 40(4): 751-760. doi: 10.11862/CJIC.20230252
18. [18]
  Zeyuan WANG , Songzhi ZHENG , Hao LI , Jingbo WENG , Wei WANG , Yang WANG , Weihai SUN . Effect of I₂ interface modification engineering on the performance of all-inorganic CsPbBr₃ perovskite solar cells. Chinese Journal of Inorganic Chemistry, 2024, 40(7): 1290-1300. doi: 10.11862/CJIC.20240021
19. [19]
  Wenke ZHENG , Ce LIU , Wei CHEN , Hongshan KE , Fanlong ZENG , Yibo LEI , Anyang LI , Wenyuan WANG . Synthesis and bonding analysis of low-coordinate Fe and Cr complexes with ultra-bulky silylamino groups. Chinese Journal of Inorganic Chemistry, 2025, 41(7): 1285-1293. doi: 10.11862/CJIC.20250095
20. [20]
  Yaping ZHANG , Tongchen WU , Yun ZHENG , Bizhou LIN . Z-scheme heterojunction β-Bi₂O₃ pillared CoAl layered double hydroxide nanohybrid: Fabrication and photocatalytic degradation property. Chinese Journal of Inorganic Chemistry, 2025, 41(3): 531-539. doi: 10.11862/CJIC.20240256

Get Citation

PDF

XML

Metrics

PDF Downloads(1)
Abstract views(420)
HTML views(56)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return