In this paper, Brookfield viscometer was used to test the rheological properties of sodium alginate solution and blends of sodium alginate/polyethyleneglycol（PEG）/molecular sieve in which the molecular weight of sodium alginate solution was respectively 1.59*105Da and 3.27*105Da. Besides, thermal stability and the thermal property of alginate fibers were also investigated by TGA and DSC. The fracture strength of blended alginate fibers was discussed by electronic monofilament tensile strength tester. The results showed that the system was a typical kind of non-Newtonian fluid. The apparent viscosity declined with the increase of shear rate. Rheological properties were affected by temperature and contents of the blends, at the same time, non-Newtonian index and structure viscosity index also changed. Research results were very important to the choice of wet spinning process. The thermal property and energy storage effect of alginate fibers was good, so was the fracture strength.

Alginate/polyvinyl alcohol (PVA) composite fibers containing copper ions were prepared by wet spinning. The spinning solution and manufacturing process were researched. The composite fibers were characterized by Tensile Strength Tester, SEM and TGA. This report shows that the spinning solution is a typical kind of pseudoplastic fluid. Adding boric acid to coagulation bath and putting Cu ions into composite fibers can improve the strength. The structure of composite fibers with Cu ions is denser and there are grooves on the fiber surface. In addition, the thermal property of composite fibers is steady.

Polymer materials play an important role in today's social development, and become important materials in industry, agriculture, national defense and other fields. With the further development of modern engineering material technology, polymer materials, together with information technology and biotechnology, promote the progress and development of society. The performance and quality of modified polymer materials have also entered the research field of vision of various industries and become the focus of exploration and analysis. The following is the research on the fracture behavior of modified polymer materials with the help of digital image correlation method. The purpose of this paper is to clarify the basic fracture work, shaping work and other fracture work parameters of various modified polymer materials, and grasp the root cause of fracture work parameters of modified polymer materials, so as to clarify the modification processing parameter means of these polymer materials.