Abstract
Xanthate-mediated RAFT polymerization has been used to prepare 3-star and 4-star-poly(vinyl chloride) (star-PVC) with a number average molar mass (Mn) in the range of 1 to 7 kg mol-1. The Tg of star-PVC reduces with molar mass and with the number of arms. The star-PVC have substantially lower glass-transition temperatures (Tg) than that of linear PVC of similar Mn, with the Tg of low-molar mass 4-star-PVC being -7.4 °C. The star-PVC are effective in lowering the Tg of blends with commercial PVC when added at 10-30 wt % PVC. When added even at 10 wt %, they are effective in improving the ductility of PVC with an elongation at break (EB) of ∼350% (4-star-PVC) and ∼300% (3-star-PVC) relative to commercial PVC, which is substantially higher than that for PVC conventionally plasticized with 30 wt % dioctyl phthalate under similar conditions (EB ∼160%). Importantly, the star-PVC, despite their low molar mass, do not migrate from the PVC blends when tested under standard conditions. The performance of the star-PVC as non-migratory plasticizers for PVC demonstrates the potential for an "all-PVC"flexible PVC.
Original language | English |
---|---|
Pages (from-to) | 5022–5032 |
Number of pages | 11 |
Journal | Macromolecules |
Volume | 54 |
Issue number | 11 |
DOIs | |
Publication status | Published - Jun 2022 |