Citation: TIAN Jun, WANG Baiquan, CHEN Shoushan, LIU Yu, HUANG Baotong. METALLOCENE POLYETHYLENES WITH BROAD OR BIMODAL MOLECULAR WEIGHT DISTRIBUTION*[J]. Chinese Journal of Polymer Science, ;1998, 16(4): 370-376. shu

METALLOCENE POLYETHYLENES WITH BROAD OR BIMODAL MOLECULAR WEIGHT DISTRIBUTION*

Received Date: 14 April 1998

Seven new binuclear titanocenes with different linking bridges, unsubsti-tuted or substituted on the Cp rings, were synthesized and tested for their effect on ethylenepolymerization in the presence of MAO. The polyethylenes thus obtained had broad MWDor even bimodal GPC curves, as compared with that from two reference mononuclear ti-tanocenes. This is explained by the difference in degree of steric hindrance around the activecenter sites imposed by the bulky substituted ligands assuming different configurations in the rotation of the catalyst molecules.Lower polymerization temperatures alleviate the effect of these configuration differnces,as reflected in change in MW and Mw/Mn.This effect is not caused by decomposition or disproportionation of the binuclear titanocenes as evidenced by the stability of the catalyst.
1. [1]
  Hualei Xu , Manman Han , Haiqiang Liu , Liang Qin , Lulu Chen , Hao Hu , Ran Wu , Chenyu Yang , Hua Guo , Jinrong Li , Jinxiang Fu , Qichen Hao , Yijun Zhou , Jinchao Feng , Xiaodong Wang . 4-Nitrocatechol as a novel matrix for low-molecular-weight compounds in situ detection and imaging in biological tissues by MALDI-MSI. Chinese Chemical Letters, 2024, 35(6): 109095-. doi: 10.1016/j.cclet.2023.109095
2. [2]
  Bei Li , Zhaoke Zheng . In situ monitoring of the spatial distribution of oxygen vacancies at the single-particle level. Chinese Journal of Structural Chemistry, 2024, 43(10): 100331-100331. doi: 10.1016/j.cjsc.2024.100331
3. [3]
  Fang-Yuan Chen , Wen-Chao Geng , Kang Cai , Dong-Sheng Guo . Molecular recognition of cyclophanes in water. Chinese Chemical Letters, 2024, 35(5): 109161-. doi: 10.1016/j.cclet.2023.109161
4. [4]
  Lei Wang , Jun-Jie Wu , Chang-Cun Yan , Wan-Ying Yang , Zong-Lu Che , Xin-Yu Xia , Xue-Dong Wang , Liang-Sheng Liao . Near-infrared organic lasers with ultra-broad emission bands by simultaneously harnessing four-level and six-level systems. Chinese Chemical Letters, 2024, 35(8): 109365-. doi: 10.1016/j.cclet.2023.109365
5. [5]
  Caihong Mao , Yanfeng He , Xiaohan Wang , Yan Cai , Xiaobo Hu . Synthesis and molecular recognition characteristics of a tetrapodal benzene cage. Chinese Chemical Letters, 2024, 35(8): 109362-. doi: 10.1016/j.cclet.2023.109362
6. [6]
  Cheng-Da Zhao , Huan Yao , Shi-Yao Li , Fangfang Du , Li-Li Wang , Liu-Pan Yang . Amide naphthotubes: Biomimetic macrocycles for selective molecular recognition. Chinese Chemical Letters, 2024, 35(4): 108879-. doi: 10.1016/j.cclet.2023.108879
7. [7]
  Zhimin Sun , Xin-Hui Guo , Yue Zhao , Qing-Yu Meng , Li-Juan Xing , He-Lue Sun . Dynamically switchable porphyrin-based molecular tweezer for on−off fullerene recognition. Chinese Chemical Letters, 2024, 35(6): 109162-. doi: 10.1016/j.cclet.2023.109162
8. [8]
  Li Lin , Song-Lin Tian , Zhen-Yu Hu , Yu Zhang , Li-Min Chang , Jia-Jun Wang , Wan-Qiang Liu , Qing-Shuang Wang , Fang Wang . Molecular crowding electrolytes for stabilizing Zn metal anode in rechargeable aqueous batteries. Chinese Chemical Letters, 2024, 35(7): 109802-. doi: 10.1016/j.cclet.2024.109802
9. [9]
  Minghao Hu , Tianci Xie , Yuqiang Hu , Longjie Li , Ting Wang , Tongbo Wu . Allosteric DNAzyme-based encoder for molecular information transfer. Chinese Chemical Letters, 2024, 35(7): 109232-. doi: 10.1016/j.cclet.2023.109232
10. [10]
  Chuan-Zhi Ni , Ruo-Ming Li , Fang-Qi Zhang , Qu-Ao-Wei Li , Yuan-Yuan Zhu , Jie Zeng , Shuang-Xi Gu . A chiral fluorescent probe for molecular recognition of basic amino acids in solutions and cells. Chinese Chemical Letters, 2024, 35(10): 109862-. doi: 10.1016/j.cclet.2024.109862
11. [11]
  Qihan Lin , Jiabin Xing , Yue-Yang Liu , Gang Wu , Shi-Jia Liu , Hui Wang , Wei Zhou , Zhan-Ting Li , Dan-Wei Zhang . taBOX: A water-soluble tetraanionic rectangular molecular container for conjugated molecules and taste masking for berberine and palmatine. Chinese Chemical Letters, 2024, 35(5): 109119-. doi: 10.1016/j.cclet.2023.109119
12. [12]
  Zhikang Wu , Guoyong Dai , Qi Li , Zheyu Wei , Shi Ru , Jianda Li , Hongli Jia , Dejin Zang , Mirjana Čolović , Yongge Wei . POV-based molecular catalysts for highly efficient esterification of alcohols with aldehydes as acylating agents. Chinese Chemical Letters, 2024, 35(8): 109061-. doi: 10.1016/j.cclet.2023.109061
13. [13]
  Jinyan Zhang , Fen Liu , Qian Jin , Xueyi Li , Qiong Zhan , Mu Chen , Sisi Wang , Zhenlong Wu , Wencai Ye , Lei Wang . Discovery of unusual phloroglucinol–triterpenoid adducts from Leptospermum scoparium and Xanthostemon chrysanthus by building blocks-based molecular networking. Chinese Chemical Letters, 2024, 35(6): 108881-. doi: 10.1016/j.cclet.2023.108881
14. [14]
  Zixi Zou , Jingyuan Wang , Yian Sun , Qian Wang , Da-Hui Qu . Controlling molecular assembly on time scale: Time-dependent multicolor fluorescence for information encryption. Chinese Chemical Letters, 2024, 35(7): 108972-. doi: 10.1016/j.cclet.2023.108972
15. [15]
  Ruonan Guo , Heng Zhang , Changsheng Guo , Ningqing Lv , Beidou Xi , Jian Xu . Degradation of neonicotinoids with different molecular structures in heterogeneous peroxymonosulfate activation system through different oxidation pathways. Chinese Chemical Letters, 2024, 35(9): 109413-. doi: 10.1016/j.cclet.2023.109413
16. [16]
  Wei-Yu Zhou , Zi-Han Xi , Ning-Ning Du , Li Ye , Ming-Hao Jiang , Jin-Le Hao , Bin Lin , Guo-Dong Yao , Xiao-Xiao Huang , Shao-Jiang Song . Rapid discovery of two unprecedented meroterpenoids from Daphne altaica Pall. using molecular networking integrated with MolNetEnhancer and Network Annotation Propagation. Chinese Chemical Letters, 2024, 35(8): 109030-. doi: 10.1016/j.cclet.2023.109030
17. [17]
  Keke Han , Wenjun Rao , Xiuli You , Haina Zhang , Xing Ye , Zhenhong Wei , Hu Cai . Two new high-temperature molecular ferroelectrics [1,5-3.2.2-Hdabcni]X (X = ClO₄⁻, ReO₄⁻). Chinese Chemical Letters, 2024, 35(6): 108809-. doi: 10.1016/j.cclet.2023.108809
18. [18]
  Yan Cheng , Hua-Peng Ruan , Yan Peng , Longhe Li , Zhenqiang Xie , Lang Liu , Shiyong Zhang , Hengyun Ye , Zhao-Bo Hu . Magnetic, dielectric and luminescence synergetic switchable effects in molecular material [Et₃NCH₂Cl]₂[MnBr₄]. Chinese Chemical Letters, 2024, 35(4): 108554-. doi: 10.1016/j.cclet.2023.108554
19. [19]
  Jieqiong Xu , Wenbin Chen , Shengkai Li , Qian Chen , Tao Wang , Yadong Shi , Shengyong Deng , Mingde Li , Peifa Wei , Zhuo Chen . Organic stoichiometric cocrystals with a subtle balance of charge-transfer degree and molecular stacking towards high-efficiency NIR photothermal conversion. Chinese Chemical Letters, 2024, 35(10): 109808-. doi: 10.1016/j.cclet.2024.109808
20. [20]
  Zhenchun Yang , Bixiao Guo , Zhenyu Hu , Kun Wang , Jiahao Cui , Lina Li , Chun Hu , Yubao Zhao . Molecular engineering towards dual surface local polarization sites on poly(heptazine imide) framework for boosting H₂O₂ photo-production. Chinese Chemical Letters, 2024, 35(8): 109251-. doi: 10.1016/j.cclet.2023.109251

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(406)
HTML views(5)

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