Abstract
Sedimentation velocity experiments were carried out on graft polystyrene (cf part I), using Phywe model ultra centrifuge equiped with Schlieren optical [system. Sedimentation patterns showed at least four peaks on the sedimentation boundary curve. From the results, it might be assumed at least four peaks in the distribution of molecular weight. The molecular weights of these peaks were 7.03×104, 2.11×105, 3.29×105 and 4.67×105 respectively.
By the investigation with ultra violet microscope (wave length 2645A) on the cross-section of grafted rayon, it was found that graft polystyrene at lower percent of grafting (35%) deposited mainly in the outer layer, while graft polystyrene at higher percent of grafting (212%) penetrating into the inner layer.
In the experiments on grafted rayon with X-ray diffract meter, the degree of crystallization of rayon was detected to be not influenced by graft copolymerization.
Also, grafted rayon (percent of grafting 73.3%) was levelled off with 2.5N HCl. The level-off rate of grafted rayon was much slower than that of original rayon. This phenomenon seems to be due to the penetration hindrance of acid molecule, caused by the presence of graft polystyrene. In addition, the levelled-off residue of grafted rayon was investigated by using electron microscope and the results obtained are discussed.
