Structure and properties of polyvinyl chloride physical gels

摘要: In this work, the structure and physical properties of polyvinyl chloride (PVC) gels prepared from solutions bromobenzene (BrBz) dioxane (DOA) under different gelation conditions are studied. The average size junction point for PVC in initial state combination ca. two to three chains width six eight syndiotactic sequences length form a fibril-like network structure, irrespective species solvents used, molecular weight concentration polymer. Because point/microcrystal is too small, results wide angle X-ray diffraction (WAXD) shows only broad intensity peak, implying that crystallinity very low gels. However, peak amorphous scattering PVC/DOA gel sharper than PVA/BrBz gel, indicating has thicker due larger degree polymer aggregation. morphology investigated observation dried freeze-drying method using electron microscopy. show consists mesh decreases with increasing concentration. difference properties, such as modulus gels, may be considered mainly aggregation related solvent type,