Stress-Strain Behavior of Some Acrylic Gradient Polymers.
CALIFORNIA UNIV BERKELEY DEPT OF CHEMICAL ENGINEERING
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Multicomponent polymers whose structure or composition varies as a function of position in the sample are called gradient polymers. One way to prepare gradient polymers is to permit a guest monomer to diffuse into a host polymer network. The resulting profile of the diffusion gradient is fixed by polymerizing the monomer in situ. In this work, we used 2-chloroethyl acrylate as the monomer and polymethyl methacrylate as the polymer matrix. Both gradient polymers and interpenetrating networks were prepared. It was found that the stress-strain behavior of gradient polymers is quite different from that of the interpenetrating networks of comparable composition. The former shows a yield point, and considerably enhanced fracture strain. The latter is essentially rubber in character. Possible mechanisms for the unique properties of gradient polymers are discussed. Author
- Polymer Chemistry