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1. Synthesis of unsaturated cycloexanone formaldehyde resins and their UV-curing behavior with thiols | |||
Xu Peng,Li Chaofeng,Chang Xinwei,Zhang Yanwu | |||
Chemical Engineering 27 March 2019 | |||
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Abstract:The water-soluble cyclohexanone formaldehyde resins (CFR) are synthesized using the rehydrated magnesium-aluminum hydrotalcite as the catalyst and double bonds are introduced by capping the chain ends with 5-norbornene-2,3-dicarboxylic anhydride. Through monitoring the conversion of double bonds with FT-IR, the UV-curing behavior of unsaturated CFR in the presence of pentaerythritol tetra (3-mercaptopropionate) is studied. The results show that the conversion of double bonds can reach to 64.1% at 0.66 mW/cm2 of UV light intensity when the molar ratio of double bonds to sulfhydryl groups is 1:1 in the presence of benzoin dimethyl ether (1% of molar amount of double bonds). The UV-curing kinetics conforms to the diffusion control model similar to the thermo-curing model of amine-epoxy. | |||
TO cite this article:Xu Peng,Li Chaofeng,Chang Xinwei, et al. Synthesis of unsaturated cycloexanone formaldehyde resins and their UV-curing behavior with thiols[OL].[27 March 2019] http://en.paper.edu.cn/en_releasepaper/content/4748131 |
2. Synthesis of comb-like macromolecules and their self-assembly behavior on silicon wafer | |||
LI Lina,HUANG Jiajia,ZHANG Yanwu | |||
Chemical Engineering 16 April 2018 | |||
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Abstract:Construction of macromolecular topology and control of chain sequence are foundations to synthesize macromolecules with multifunction. Comb-like macromolecules have more designable freedoms because their back-bones and branched chains can be independently designed and synthesized. Herein, the rigid back-bones of comb-like macromolecules had been synthesized by ROMP of norbornene derivatives anchoring RAFT agent. The gradient polymer branched chains with controlled sequence structure was synthesized through a modified RAFT miniemulsion polymerization of 4-vinylpridiene (4VP) and t-butyl acrylate (tBA) in a semi-batch manner. These comb-like macromolecules can self-assembly into arrays due to the stiffness of backbone when dilute solution of comb-like macromolecules are brushed onto silicon surface. The size of arrays is affected by molecular weight and sequence structure of branched chains. The effect of these arrays on water contact angle of silicon is studied also. | |||
TO cite this article:LI Lina,HUANG Jiajia,ZHANG Yanwu. Synthesis of comb-like macromolecules and their self-assembly behavior on silicon wafer[OL].[16 April 2018] http://en.paper.edu.cn/en_releasepaper/content/4744582 |
3. Fracture mechanism of amorphous polyethylene at strain fields | |||
Huang Lan,Cao Dapeng | |||
Chemical Engineering 30 July 2014 | |||
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Abstract:Owing to the wide application of polymeric materials, understanding the fracture mechanism of amorphous polymer at strain fields is a fundamentally important challenge. In this work, we use molecular dynamics simulations to investigate the uniaxial deformation of amorphous polyethylene and to monitor the polyethylene fracture process induced by stretching. Results indicate that the polyethylene systems with a molecular weight ranging about 600-800 united atoms per chain exhibit the fracture behavior at T<200 K and the strain of 1.0. Further study shows that in the stretching process, the disentanglement and orientation of chains lead to the formation of small cavities in the middle region of the system, and the small cavities subsequently form a large hole, leading to the fracture of the whole system. Definitely, the fracture is determined by the two factors of mobility and entanglement of chains. The polyethylene systems with high chain mobility or high chain entanglement do not fracture. Finally, a schematic diagram is put forward to illustrate the fracture behavior. | |||
TO cite this article:Huang Lan,Cao Dapeng. Fracture mechanism of amorphous polyethylene at strain fields[OL].[30 July 2014] http://en.paper.edu.cn/en_releasepaper/content/4605105 |
4. Polymeric Biomaterialsfor Biological and Pharmaceutical Applications | |||
Wang Xue-Jun | |||
Chemical Engineering 05 December 2005 | |||
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Abstract:Biomaterials may be defined as designed materials, which are used in contact and interact with tissue, blood, cells, proteins and any other living substance. The recent developments and applications of polymeric biomaterials in the field of drug delivery and tissue engineering were reviewed. The review suggests a potential future for biomaterials in the pharmaceutical, biomedical and biological fields. | |||
TO cite this article:Wang Xue-Jun. Polymeric Biomaterialsfor Biological and Pharmaceutical Applications[OL].[ 5 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4086 |
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