Citation: Xuan-bo Liu, Yong-feng Zhao, Xing-he Fan, Er-qiang Chen. CRYSTAL ORIENTATION AND MELTING BEHAVIOR OF POLY(-CAPROLACTONE) UNDER ONE-DIMENSIONALLY HARD CONFINED MICROENVIRONMENT[J]. Chinese Journal of Polymer Science, ;2013, 31(6): 946-958. doi: 10.1007/s10118-013-1285-9 shu

CRYSTAL ORIENTATION AND MELTING BEHAVIOR OF POLY(-CAPROLACTONE) UNDER ONE-DIMENSIONALLY HARD CONFINED MICROENVIRONMENT

Corresponding author: Er-qiang Chen,
Received Date: 31 January 2013
Revised Date: 6 February 2013

Fund Project: This work was financially supported by the National Nature Science Foundation of China (Nos. 20774006, 20990232, and 21074003).

Crystal orientation and melting behavior of poly(-caprolactone) in a diblock copolymer of poly(-caprolactone)-block-poly(2,5-bis[4-methoxyphenyl]oxycarbonyl)styrene) (PCL-b-PMPCS) was investigated. The degrees of polymerization of the PCL and PMPCS block are 200 and 98, respectively. With the PMPCS in a columnar liquid crystalline phase, the diblock is rod-coil one, which exhibits a lamellar phase morphology with the PCL layer thickness of 15.2 nm. Since the glass transition temperature of PMPCS block is much higher than the melting temperature of PCL, the crystallization of PCL is in a one-dimensionally hard confinement environment. Mainly on the basis of two-dimensional wide-angle X-ray diffraction experiments, we identified the orientation of PCL isothermally crystallized at various crystallization temperatures (Tcs). At high Tcs (Tc 10℃), the c-axis of the PCL crystal is along the layer normal of the microphase-separated sturcture. Decreasing Tc can result in the tilting of PCL c-axis with respect to the layer normal. The lower the Tc is, the more the c-axis inclines. Meanwhile, the b-axis of PCL remains perpendicular to the layer normal. At a very low Tc of -78℃, the orientation of the PCL crystals is completely random. For the samples isothermally crystallized at Tc 10℃, double melting behavior can be observed. While the low temperature endotherm reflects the melting of the crystals originally formed at the Tc applied, the high temperature one is associated with the crystals subjected to the process of recrystallization/reorganization upon heating due to the annealing effect.
- Crystallization,
- Melting,
- Confinement,
- Diblock copolymer,
- Rod-coil
1. [1]
1. [1]
  Conghui Wang , Lei Xu , Zhenhua Jia , Teck-Peng Loh . Recent applications of macrocycles in supramolecular catalysis. Chinese Chemical Letters, 2024, 35(4): 109075-. doi: 10.1016/j.cclet.2023.109075
2. [2]
  Jun Lu , Jinrui Yan , Yaohao Guo , Junjie Qiu , Shuangliang Zhao , Bo Bao . Controlling solid form and crystal habit of triphenylmethanol by antisolvent crystallization in a microfluidic device. Chinese Chemical Letters, 2024, 35(4): 108876-. doi: 10.1016/j.cclet.2023.108876
3. [3]
  Min Huang , Ru Cheng , Shuai Wen , Liangtong Li , Jie Gao , Xiaohui Zhao , Chunmei Li , Hongyan Zou , Jian Wang . Ultrasensitive detection of microRNA-21 in human serum based on the confinement effect enhanced chemical etching of gold nanorods. Chinese Chemical Letters, 2024, 35(9): 109379-. doi: 10.1016/j.cclet.2023.109379
4. [4]
  Xuanyu Wang , Zhao Gao , Wei Tian . Supramolecular confinement effect enabling light-harvesting system for photocatalytic α-oxyamination reaction. Chinese Chemical Letters, 2024, 35(11): 109757-. doi: 10.1016/j.cclet.2024.109757
5. [5]
  Siwei Wang , Wei-Lei Zhou , Yong Chen . Cucurbituril and cyclodextrin co-confinement-based multilevel assembly for single-molecule phosphorescence resonance energy transfer behavior. Chinese Chemical Letters, 2024, 35(12): 110261-. doi: 10.1016/j.cclet.2024.110261
6. [6]
  Xingxing Jiang , Yuxin Zhao , Yan Kong , Jianju Sun , Shangzhao Feng , Xin Lu , Qi Hu , Hengpan Yang , Chuanxin He . Support effect and confinement effect of porous carbon loaded tin dioxide nanoparticles in high-performance CO₂ electroreduction towards formate. Chinese Chemical Letters, 2025, 36(1): 109555-. doi: 10.1016/j.cclet.2024.109555
7. [7]
  Jun Dong , Senyuan Tan , Sunbin Yang , Yalong Jiang , Ruxing Wang , Jian Ao , Zilun Chen , Chaohai Zhang , Qinyou An , Xiaoxing Zhang . Spatial confinement of free-standing graphene sponge enables excellent stability of conversion-type Fe₂O₃ anode for sodium storage. Chinese Chemical Letters, 2025, 36(3): 110010-. doi: 10.1016/j.cclet.2024.110010
8. [8]
  Xianchen Hu , Junli Yang , Fang Gao , Zhiyong Zhao , Simin Liu . Highly selective [4+4] cross-photodimerization of (4a-azonia)anthracenes driven by confinement of D-A hetero-guest pair in cucurbit[10]uril host. Chinese Chemical Letters, 2025, 36(3): 109967-. doi: 10.1016/j.cclet.2024.109967
9. [9]
  Yiwen Lin , Yijie Chen , Chunhui Deng , Nianrong Sun . Integration of resol/block-copolymer carbonization and machine learning: A convenient approach for precise monitoring of glycan-associated disorders. Chinese Chemical Letters, 2024, 35(12): 109813-. doi: 10.1016/j.cclet.2024.109813
10. [10]
  Changlin Su , Wensheng Cai , Xueguang Shao . Water as a probe for the temperature-induced self-assembly transition of an amphiphilic copolymer. Chinese Chemical Letters, 2025, 36(4): 110095-. doi: 10.1016/j.cclet.2024.110095
11. [11]
  Qian Wang , Ting Gao , Xiwen Lu , Hangchao Wang , Minggui Xu , Longtao Ren , Zheng Chang , Wen Liu . Nanophase separated, grafted alternate copolymer styrene-maleic anhydride as an efficient room temperature solid state lithium ion conductor. Chinese Chemical Letters, 2024, 35(7): 108887-. doi: 10.1016/j.cclet.2023.108887

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(657)
HTML views(36)

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