Home

Citation: Gao Cai, Wang Wen-Hua, Hu Tong-Ji, Xu Yi, Zhou Guo-Yan, Hua Ze-Zhao. Glass Transition and Enthalpy Relaxation Behavior of Ethylene Glycol and Its Aqueous Solution with Different Crystallinity[J]. Acta Physico-Chimica Sinica, ;2004, 20(07): 701-706. doi: 10.3866/PKU.WHXB20040707 shu

Glass Transition and Enthalpy Relaxation Behavior of Ethylene Glycol and Its Aqueous Solution with Different Crystallinity

1.
Institute of Cryomedicine and food refrigeration, Shanghai University for Science and Technology, Shanghai　200093

Received Date: 12 December 2003
Available Online: 15 July 2004

In order to investigate the effects of the crystals on glass transition and enthalpy relaxation behaviors, differential scanning calorimetry (DSC) and cryomicroscopy technique were used to study ethylene glycol (EG) and its aqueous solution (50％EG, mass fraction) with different crystallinity. Isothermal crystallization method was used in devitrification region to get different crystal fractions after samples quenched below the glass transition temperature (Tg).The DSC thermograms upon heating showed that EG had a single glass transition while 50％EG had two (amorphous phaseⅠ and the warmer one, phase Ⅱ)with different crystal fractions. Tg of phaseⅠ was equal to while phase Ⅱ was 6 ℃ higher than Tg of 50％EG in purely amorphous phase. It is believed that the lower transition represents the glass transition of bulk amorphous phase of EG aqueous solution glass state, while the second one is related to inclusions, whose mobility is restricted by ice crystals. Cryomicroscopy experiments indicated that EG crystal had regular shape while ice crystal in 50％EG aqueous solution glass matrix had no clear surface. It can be concluded that contact area between crystal and amorphous phase in EG is larger than that in 50％EG, which is helpful to explain double glass-like transitions. Isothermal annealing experiments at temperatures lower than Tg were also conducted on these amorphous samples in DSC, and KWW（Kohlrausch-Williams-Watts）decay function was used to analyze DSC enthalpy relaxation data. The results showed that both the two amorphous phases presented in 50％EG experience enthalpy relaxation, and the relaxation process of phase Ⅰ is faster than that of phase Ⅱ at the same value of (Tg－Ta).
- Glass transition;Enthalpy relaxation;Ethylene glycol;Differential scanning calorimetry;Cryomicroscopy
1. [1]
  Xinhao Yan , Guoliang Hu , Ruixi Chen , Hongyu Liu , Qizhi Yao , Jiao Li , Lingling Li . Polyethylene Glycol-Ammonium Sulfate-Nitroso R Salt System for the Separation of Cobalt (II). University Chemistry, 2024, 39(6): 287-294. doi: 10.3866/PKU.DXHX202310073
2. [2]
  Zhuoming Liang , Ming Chen , Zhiwen Zheng , Kai Chen . Multidimensional Studies on Ketone-Enol Tautomerism of 1,3-Diketones By ¹H NMR. University Chemistry, 2024, 39(7): 361-367. doi: 10.3866/PKU.DXHX202311029
3. [3]
  Donghui PAN , Yuping XU , Xinyu WANG , Lizhen WANG , Junjie YAN , Dongjian SHI , Min YANG , Mingqing CHEN . Preparation and in vivo tracing of ⁶⁸Ga-labeled PM_2.5 mimetic particles for positron emission tomography imaging. Chinese Journal of Inorganic Chemistry, 2024, 40(4): 669-676. doi: 10.11862/CJIC.20230468
4. [4]
  Yiling Wu , Peiyao Jin , Shenyue Tian , Ji Zhang . The Star of Sugar Substitutes: An Interview of Erythritol. University Chemistry, 2024, 39(9): 22-27. doi: 10.12461/PKU.DXHX202404034
5. [5]
  Xuanzhu Huo , Yixi Liu , Qiyu Wu , Zhiqiang Dong , Chanzi Ruan , Yanping Ren . Integrated Experiment of “Electrolytic Preparation of Cu₂O and Gasometric Determination of Avogadro’s Constant: Implementation, Results, and Discussion: A Micro-Experiment Recommended for Freshmen in Higher Education at Various Levels Across the Nation. University Chemistry, 2024, 39(3): 302-307. doi: 10.3866/PKU.DXHX202308095
6. [6]
  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
7. [7]
  Zhiwen HU , Weixia DONG , Qifu BAO , Ping LI . Low-temperature synthesis of tetragonal BaTiO₃ for piezocatalysis. Chinese Journal of Inorganic Chemistry, 2024, 40(5): 857-866. doi: 10.11862/CJIC.20230462
8. [8]
  Yuping Wei , Yiting Wang , Jialiang Jiang , Jinxuan Deng , Hong Zhang , Xiaofei Ma , Junjie Li . Interdisciplinary Teaching Practice——Flexible Wearable Electronic Skin for Low-Temperature Environments. University Chemistry, 2024, 39(10): 261-270. doi: 10.12461/PKU.DXHX202404007
9. [9]
  Zhanggui DUAN , Yi PEI , Shanshan ZHENG , Zhaoyang WANG , Yongguang WANG , Junjie WANG , Yang HU , Chunxin LÜ , Wei ZHONG . Preparation of UiO-66-NH₂ supported copper catalyst and its catalytic activity on alcohol oxidation. Chinese Journal of Inorganic Chemistry, 2024, 40(3): 496-506. doi: 10.11862/CJIC.20230317
10. [10]
  Xiao Liu , Guangzhong Cao , Mingli Gao , Hong Wu , Hongyan Feng , Chenxiao Jiang , Tongwen Xu . Seawater Salinity Gradient Energy’s Job Application in the Field of Membranes. University Chemistry, 2024, 39(9): 279-282. doi: 10.3866/PKU.DXHX202306043
11. [11]
  Ronghao Zhao , Yifan Liang , Mengyao Shi , Rongxiu Zhu , Dongju Zhang . Investigation into the Mechanism and Migratory Aptitude of Typical Pinacol Rearrangement Reactions: A Research-Oriented Computational Chemistry Experiment. University Chemistry, 2024, 39(4): 305-313. doi: 10.3866/PKU.DXHX202309101
12. [12]
  Ling Zhang , Jing Kang . Turn Waste into Valuable: Preparation of High-Strength Water-Based Adhesives from Polymethylmethacrylate Wastes: a Comprehensive Chemical Experiments. University Chemistry, 2024, 39(2): 221-226. doi: 10.3866/PKU.DXHX202306075
13. [13]
  Naiying Fan , Chuanli Qin , Guo Zhang , Bin Wang , Yan Wang , Bing Zheng , Yichun Qu , Zhiyao Sun , Guanghui An . Case Design of Course Ideological and Political Education in Chemical Experiment Safety: the Safe Use of Common Laboratory Instruments and Glassware. University Chemistry, 2024, 39(2): 242-247. doi: 10.3866/PKU.DXHX202309061
14. [14]
  Xiaoling LUO , Pintian ZOU , Xiaoyan WANG , Zheng LIU , Xiangfei KONG , Qun TANG , Sheng WANG . Synthesis, crystal structures, and properties of lanthanide metal-organic frameworks based on 2, 5-dibromoterephthalic acid ligand. Chinese Journal of Inorganic Chemistry, 2024, 40(6): 1143-1150. doi: 10.11862/CJIC.20230271
15. [15]
  Hongsheng Tang , Yonghe Zhang , Dexiang Wang , Xiaohui Ning , Tianlong Zhang , Yan Li , Hua Li . A Wonderful Journey through the Kingdom of Hazardous Chemicals. University Chemistry, 2024, 39(9): 196-202. doi: 10.12461/PKU.DXHX202403098
16. [16]
  Juntao Yan , Liang Wei . 2D S-Scheme Heterojunction Photocatalyst. Acta Physico-Chimica Sinica, 2024, 40(10): 2312024-. doi: 10.3866/PKU.WHXB202312024
17. [17]
  Xiuyun Wang , Jiashuo Cheng , Yiming Wang , Haoyu Wu , Yan Su , Yuzhuo Gao , Xiaoyu Liu , Mingyu Zhao , Chunyan Wang , Miao Cui , Wenfeng Jiang . Improvement of Sodium Ferric Ethylenediaminetetraacetate (NaFeEDTA) Iron Supplement Preparation Experiment. University Chemistry, 2024, 39(2): 340-346. doi: 10.3866/PKU.DXHX202308067
18. [18]
  Jianfeng Yan , Yating Xiao , Xin Zuo , Caixia Lin , Yaofeng Yuan . Comprehensive Chemistry Experimental Design of Ferrocenylphenyl Derivatives. University Chemistry, 2024, 39(4): 329-337. doi: 10.3866/PKU.DXHX202310005
19. [19]
  Liangzhen Hu , Li Ni , Ziyi Liu , Xiaohui Zhang , Bo Qin , Yan Xiong . A Green Chemistry Experiment on Electrochemical Synthesis of Benzophenone. University Chemistry, 2024, 39(6): 350-356. doi: 10.3866/PKU.DXHX202312001
20. [20]
  Meijin Li , Xirong Fu , Xue Zheng , Yuhan Liu , Bao Li . The Marvel of NAD⁺: Nicotinamide Adenine Dinucleotide. University Chemistry, 2024, 39(9): 35-39. doi: 10.12461/PKU.DXHX202401027

Get Citation

PDF

XML

Metrics

PDF Downloads(2885)
Abstract views(2709)
HTML views(27)

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