最新刊期
      卷 0 ， 期 0 ， 2020
      • Yingtai Jin,Fengfu Li,Pixin Wang,Yue Wu
        Vol. 5, Issue 4, Pages: 211-217(1992) DOI: 10.14028/j.cnki.1003-3726.1992.04.002
        摘要：New catalysts and polymers have been finding with the deepening researches on nature of rare earth catalysts, further more,some of these catalysts have been used in commercial productions for dienepolymers. In this review, recent progresses of rare earth catalyst in polymer science and industry are briefly presented in which it is focused on the outstanding achivements in the field of polymer of olefin, diene and other monomers catalyzed by rare earth catalysts.  
        关键词：Rare earth catalyst;Polymerization mechanism;olefin;diene;evaluation of polymer   
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        发布时间：2022-09-18
      • Xiaosan Li,Zongneng Qi
        Vol. 5, Issue 4, Pages: 218-227(1992) DOI: 10.14028/j.cnki.1003-3726.1992.04.003
        摘要：Polyethylene gas pipe undergoes cracking and brittle failure in the neighbourhood of room temperature when a low stress is applied for a long period of time. The cracking process includes two stages, e.g. the slow crack growth (SCG) stage which takes most of the cracking period and the fast crack growth (FCG) stage which is a relatively very short period. The lifetime of PE pipe can be estimated by predicting the persistence time of the SCG stage. The SCG process can be simulated by conventional tensile test and three —point bending test of which tht failure time can be predicted using Dugdale model:The mechanism is that the cracking, which is a brittle failure ,is caused mainly by the disentanglement of the tie molecules in the amorphous zone and by the slipping out of them from the crystalline zone. The SCG process is influenced by external factors such as applied stress, temperature ,and the notch depth of the sample as well degree of branching, branch length,and crystallinity.  
        关键词：Polyethylene pipe;crack growth;kinetics;brittle failure;Dugdale model   
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        发布时间：2022-09-18
      • Faxiang Ji,Mingquan Ye,Minghua Chen
        Vol. 5, Issue 4, Pages: 228-236,227(1992) DOI: 10.14028/j.cnki.1003-3726.1992.04.004
        摘要：In this paper,the synthetic methods,UV absorption, photo sensitivity, electrical conductivity and such special properties of polysilane polymer are introduced. We also introduce here the chemical reactions of polysilane polymer and the applications of polysilane materials.  
        关键词：Polysilane;Polysilane Polymer;Functional material;Organometallic Polymer   
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        发布时间：2022-09-18
      • Zhuting Wang,Kaijuan Lu
        Vol. 5, Issue 4, Pages: 237-244,256(1992) DOI: 10.14028/j.cnki.1003-3726.1992.04.005
        摘要：Polymers of phthalocyanines were introduced. Thermostable, conducting, semiconducting, photoconducting . optical recording and photo polymeric materials were discussed.  
        关键词：Phthalocyanines;Thermostable polymer;Conducting polymer;Semiconducting polymer;Photoconductor;Photopolymer and polymeric catalysts   
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        发布时间：2022-09-18
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