Branched polystyrene with high reflex index synthesized from selenium-mediated polymerization

2013 ◽  
Vol 52 (4) ◽  
pp. 504-510 ◽  
Author(s):  
Jinjie Lu ◽  
Nianchen Zhou ◽  
Xiangqiang Pan ◽  
Jian Zhu ◽  
Xiulin Zhu
Keyword(s):  
Branched Polystyrene

Preparation and Properties of Monodisperse Branched Polystyrene

1962 ◽  
Author(s):  
M. Morton ◽  
T. E. Helminiak ◽  
S. D. Gardkary ◽  
F. Bueche
Keyword(s):  
Branched Polystyrene

scholarly journals Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 365
Author(s):  
Hyeong Yong Song ◽  
Lorenz Faust ◽  
Jinha Son ◽  
Mingeun Kim ◽  
Seung Joon Park ◽  
...  
Keyword(s):  
Low Frequency ◽  
Oscillatory Shear ◽  
Zero Shear Viscosity ◽  
Plateau Modulus ◽  
Intrinsic Nonlinearity ◽  
Linear Viscoelastic ◽  
The Difference ◽  
Total Molecular Weight ◽  
Branched Polystyrene ◽  
Medium Amplitude Oscillatory Shear

Linear and nonlinear rheological properties of model comb polystyrenes (PS) with loosely to densely grafted architectures were measured under small and medium amplitude oscillatory shear (SAOS and MAOS) flow. This comb PS set had the same length of backbone and branches but varied in the number of branches from 3 to 120 branches. Linear viscoelastic properties of the comb PS were compared with the hierarchical model predictions. The model underpredicted zero-shear viscosity and backbone plateau modulus of densely branched comb with 60 or 120 branches because the model does not include the effect of side chain crowding. First- and third-harmonic nonlinearities reflected the hierarchy in the relaxation motion of comb structures. Notably, the low-frequency plateau values of first-harmonic MAOS moduli scaled with M w − 2 (total molecular weight), reflecting dynamic tube dilution (DTD) by relaxed branches. Relative intrinsic nonlinearity Q0 exhibited the difference between comb and bottlebrush via no low-frequency Q0 peak of bottlebrush corresponding to backbone relaxation, which is probably related to the stretched backbone conformation in bottlebrush.

scholarly journals Synthesis of Well-Defined Three-Arm Star-Branched Polystyrene through Arm-First Coupling Approach by Atom Transfer Radical Polymerization

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Syed Shahabuddin ◽  
Fatem Hamime Ismail ◽  
Sharifah Mohamad ◽  
Norazilawati Muhamad Sarih
Keyword(s):  
Molecular Weight ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Polymeric Chain ◽  
Atom Transfer ◽  
Simple Route ◽  
Coupling Strategy ◽  
Coupling Approach ◽  
Branched Polystyrene ◽  
Williamson Reaction

Here we describe a simple route to synthesize three-arm star-branched polystyrene. Atom transfer radical polymerization technique has been utilized to yield branched polystyrene involving Williamson coupling strategy. Initially a linear polymeric chain of predetermined molecular weight has been synthesized which is further end-functionalized into a primary alkyl bromide moiety, a prime requisition for Williamson reaction. The end-functionalized polymer is then coupled using 1,1,1-tris(4-hydroxyphenyl)ethane, a trifunctional core molecule, to give well-defined triple-arm star-branched polystyrene.

Syntheses of 3-arm and 4-arm star-branched polystyrene Ru(II) complexes by the click-to-chelate approach

2010 ◽  
Vol 49 (3) ◽  
pp. 746-753 ◽  
Author(s):  
Chunhong Zhang ◽  
Xiande Shen ◽  
Ryosuke Sakai ◽  
Michael Gottschaldt ◽  
Ulrich S. Schubert ◽  
...  
Keyword(s):  
Branched Polystyrene
Sign in / Sign up

Export Citation Format

Share Document