Photon correlation dynamics of unentangled star-shaped poly(ε-caprolactone)s with extremely small branches and its interaction with plasticization in miscible blend system
- Authors
- Choi, W.; Chung, J.W.; Kwak, S.-Y.
- Issue Date
- Oct-2016
- Publisher
- Elsevier Ltd
- Keywords
- Miscible polymer blend; Plasticization; Pseudo-bulk dynamics
- Citation
- Polymer (United Kingdom), v.103, pp.19 - 26
- Journal Title
- Polymer (United Kingdom)
- Volume
- 103
- Start Page
- 19
- End Page
- 26
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/32149
- DOI
- 10.1016/j.polymer.2016.09.033
- ISSN
- 0032-3861
- Abstract
- The dynamic effects of unentangled star-shaped polymers with extremely small branches on the plasticization of miscible polymer blends are investigated using ultra-small branched star poly(ε-caprolactone)s (USB-SPCLs), poly(vinyl chloride) (PVC), and their blends. Photon correlation dynamics of USB-SPCLs supports our previous suggestion that a whole USB-SPCL molecule acts as a single coarse-grain unit with dynamically-equivalent branches because of the extremely small branches, resulting in the total-molecular-weight-dependent Rouse dynamic behaviors of USB-SPCLs, regardless of the molecular architectures. The dynamic light scattering intensity autocorrelation curves of miscible PVC/USB-SPCL blends reveal that strong intermolecular interactions between PVC and USB-SPCL molecules determine the dynamic homogeneous behaviors of the blends despite their significantly different mobilities. The molecular motions of the blends depend on the total-molecular-weight-dependent Rouse dynamic behaviors of USB-SPCLs. These dynamic results clearly show the plasticization of the entangled neat linear PVC matrix by distinctive and rapid molecular mobility of USB-SPCLs. © 2016
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