Citation: JIN Xigao, Thomas S. Ellis, Frank E. Karasz. THE EFFECTS OF IRRADIATION ON THE THERMAL PROPERTIES OF SEMI-CRYSTALLINE POLYAMIDES*[J]. Chinese Journal of Polymer Science, ;1985, 3(3): 234-243. shu

THE EFFECTS OF IRRADIATION ON THE THERMAL PROPERTIES OF SEMI-CRYSTALLINE POLYAMIDES*

Received Date: 3 April 1985

Irradiation crosslinking of semi-crystalline polyamides was performed by high energy electronswith various dosages. It is known that the melting behavior of the polymers after irradiation is acomplex phenomenon. In company with the wide angle X-ray diffraction and DSC data of irradiatedand unirradiated polyamides it is possible to develop the local order and perfection of the crystallinitiesslightly which resulted from introduction of intermolecular crosslinking in amorphous region, incl-uding in amorphous-crystalline interface and crystalline defect regions due to irradiation.It can be explained that slight increase of melting temperature(Tm) and heat of fusion(△Hf) with increasing dosage for both of higher crystallinity nylon 4 and nylon 6.For irradiated lower crystallinity nylons,in contrast,the Tm and △Hf decrease obviously with increasing dosage.In this case,radiation cross-linking"freeze in" the pre-existing morphology,and then the prevention for reorganization during heating is a dominant effect.The Tm from the second melting for all of the samples were depressed,corresponding with Flory theory.Therefore the crosslinks imposed on the molecules restrained the molecular mobility,and that not only depresses the crystallinity but also increases the imperfection of crystallites when the radiated polymer melted and then recrystallized.These are also reflected in the depression of heat and entropy of fusion as well as the appearance of double melting peaks on the DSC thermograms.
1. [1]
  Qian Wu , Mengda Xu , Tianjiao Ma , Shuzhen Yan , Jin Li , Xuesong Jiang . Chalcone-derived oxime esters with efficient photoinitiation properties under LED irradiation. Chinese Chemical Letters, 2025, 36(3): 110427-. doi: 10.1016/j.cclet.2024.110427
2. [2]
  Ziyi Liu , Feifei Guo , Tingting Cao , Youxuan Sun , Xutang Tao , Zeliang Gao . High thermal conductivity in Ga2TeO6 crystals: Synergistic effects of rigid polyhedral frameworks and stereochemically inert cations. Chinese Journal of Structural Chemistry, 2025, 44(4): 100544-100544. doi: 10.1016/j.cjsc.2025.100544
3. [3]
  Zirui Zhu , Peng Liu , Jinhua Wang , Hongbin Zhang , Wei Luo . Effects of nano-metakaolin on the enhanced properties and microstructure development of natural hydraulic lime. Chinese Chemical Letters, 2025, 36(4): 109794-. doi: 10.1016/j.cclet.2024.109794
4. [4]
  Jia-Cheng Hou , Wei Cai , Hong-Tao Ji , Li-Juan Ou , Wei-Min He . Recent advances in semi-heterogenous photocatalysis in organic synthesis. Chinese Chemical Letters, 2025, 36(2): 110469-. doi: 10.1016/j.cclet.2024.110469
5. [5]
  Tingting Liu , Pengfei Sun , Wei Zhao , Yingshuang Li , Lujun Cheng , Jiahai Fan , Xiaohui Bi , Xiaoping Dong . Magnesium doping to improve the light to heat conversion of OMS-2 for formaldehyde oxidation under visible light irradiation. Chinese Chemical Letters, 2024, 35(4): 108813-. doi: 10.1016/j.cclet.2023.108813
6. [6]
  Yan-Kai Zhang , Yong-Zheng Zhang , Chun-Xiao Jia , Fang Wang , Xiuling Zhang , Yuhang Wu , Zhongmin Liu , Hui Hu , Da-Shuai Zhang , Longlong Geng , Jing Xu , Hongliang Huang . A stable Zn-MOF with anthracene-based linker for Cr(VI) photocatalytic reduction under sunlight irradiation. Chinese Chemical Letters, 2024, 35(12): 109756-. doi: 10.1016/j.cclet.2024.109756
7. [7]
  Juan Guo , Mingyuan Fang , Qingsong Liu , Xiao Ren , Yongqiang Qiao , Mingju Chao , Erjun Liang , Qilong Gao . Zero thermal expansion in Cs₂W₃O₁₀. Chinese Chemical Letters, 2024, 35(7): 108957-. doi: 10.1016/j.cclet.2023.108957
8. [8]
  Ming Yue , Yi-Rong Wang , Jia-Yong Weng , Jia-Li Zhang , Da-Yu Chi , Mingjin Shi , Xiao-Gang Hu , Yifa Chen , Shun-Li Li , Ya-Qian Lan . Multi-metal porous crystalline materials for electrocatalysis applications. Chinese Chemical Letters, 2025, 36(6): 110049-. doi: 10.1016/j.cclet.2024.110049
9. [9]
  Wenyu Gao , Liming Zhang , Chuang Zhao , Lixiang Liu , Xingran Yang , Jinbo Zhao . Controlled semi-Pinacol rearrangement on a strained ring: Efficient access to multi-substituted cyclopropanes by group migration strategy. Chinese Chemical Letters, 2024, 35(9): 109447-. doi: 10.1016/j.cclet.2023.109447
10. [10]
  Xin He , Feng Liu , Tao Tu . Double redox-mediated intrinsic semiconductor photocatalysis: Practical semi-heterogeneous synthesis. Chinese Chemical Letters, 2025, 36(3): 110621-. doi: 10.1016/j.cclet.2024.110621
11. [11]
  Hongyuan Sha , Dongling Yang , Yanran Shang , Zujian Wang , Rongbing Su , Chao He , Xiaoming Yang , Xifa Long . Trithionic guanidine: A novel semi-organic short-wave ultraviolet nonlinear optical sulfate with dimeric heteroleptic tetrahedra. Chinese Chemical Letters, 2025, 36(4): 109730-. doi: 10.1016/j.cclet.2024.109730
12. [12]
  Sixiao Liu , Tianyi Wang , Lei Zhang , Chengyin Wang , Huan Pang . Cerium-based metal-organic framework-modified natural mineral vermiculite for photocatalytic nitrogen fixation under visible-light irradiation. Chinese Chemical Letters, 2025, 36(3): 110058-. doi: 10.1016/j.cclet.2024.110058
13. [13]
  Jia-Cheng Hou , Hong-Tao Ji , Yu-Han Lu , Jia-Sheng Wang , Yao-Dan Xu , Yan-Yan Zeng , Wei-Min He . Sustainable and practical semi-heterogeneous photosynthesis of 5-amino-1,2,4-thiadiazoles over WS₂/TEMPO. Chinese Chemical Letters, 2024, 35(8): 109514-. doi: 10.1016/j.cclet.2024.109514
14. [14]
  Xiaoru LIU , Jinlian SHI , Yajia ZHENG , Shuangcun MO , Zhongxuan XU . Two Ni-based frameworks with helices and dinuclear units constructed from semi-rigid carboxylic acid and imidazole derivatives. Chinese Journal of Inorganic Chemistry, 2025, 41(4): 797-808. doi: 10.11862/CJIC.20240328
15. [15]
  Ruizhi Yang , Xia Li , Weiping Guo , Zixuan Chen , Hongwei Ming , Zhong-Zhen Luo , Zhigang Zou . New thermoelectric semiconductors Pb5Sb12+xBi6-xSe32 with ultralow thermal conductivity. Chinese Journal of Structural Chemistry, 2024, 43(3): 100268-100268. doi: 10.1016/j.cjsc.2024.100268
16. [16]
  Chaozheng He , Pei Shi , Donglin Pang , Zhanying Zhang , Long Lin , Yingchun Ding . First-principles study of the relationship between the formation of single atom catalysts and lattice thermal conductivity. Chinese Chemical Letters, 2024, 35(6): 109116-. doi: 10.1016/j.cclet.2023.109116
17. [17]
  Jiao Li , Chenyang Zhang , Chuhan Wu , Yan Liu , Xuejian Zhang , Xiao Li , Yongtao Li , Jing Sun , Zhongmin Su . Defined organic-octamolybdate crystalline superstructures derived Mo₂C@C as efficient hydrogen evolution electrocatalysts. Chinese Chemical Letters, 2024, 35(6): 108782-. doi: 10.1016/j.cclet.2023.108782
18. [18]
  Wengao Zeng , Yuchen Dong , Xiaoyuan Ye , Ziying Zhang , Tuo Zhang , Xiangjiu Guan , Liejin Guo . Crystalline carbon nitride with in-plane built-in electric field accelerates carrier separation for excellent photocatalytic hydrogen evolution. Chinese Chemical Letters, 2024, 35(4): 109252-. doi: 10.1016/j.cclet.2023.109252
19. [19]
  Rui Deng , Wenjie Jiang , Tianqi Yu , Jiali Lu , Boyao Feng , Panagiotis Tsiakaras , Shibin Yin . Cycad-leaf-like crystalline-amorphous heterostructures for efficient urea oxidation-assisted water splitting. Chinese Journal of Structural Chemistry, 2024, 43(7): 100290-100290. doi: 10.1016/j.cjsc.2024.100290
20. [20]
  Ning DING , Siyu WANG , Shihua YU , Pengcheng XU , Dandan HAN , Dexin SHI , Chao ZHANG . Crystalline and amorphous metal sulfide composite electrode materials with long cycle life: Preparation and performance of hybrid capacitors. Chinese Journal of Inorganic Chemistry, 2024, 40(9): 1784-1794. doi: 10.11862/CJIC.20240146

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(746)
HTML views(6)

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