Investigating the effects of polymer molecular weight and non-solvent content on the phase separation, surface morphology and hydrophobicity of polyvinyl chloride films

2018 ◽  
Vol 428 ◽  
pp. 933-940 ◽  
Author(s):  
Zahra Khoryani ◽  
Javad Seyfi ◽  
Mehdi Nekoei
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Surface Morphology ◽  
Polyvinyl Chloride ◽  
Polymer Molecular Weight ◽  
Solvent Content ◽  
Separation Surface

Strong polymer molecular weight-dependent material interactions: impact on the formation of the polymer/fullerene bulk heterojunction morphology

2017 ◽  
Vol 5 (25) ◽  
pp. 13176-13188 ◽  
Author(s):  
Joo-Hyun Kim ◽  
Abay Gadisa ◽  
Charley Schaefer ◽  
Huifeng Yao ◽  
Bhoj R. Gautam ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Molecular Mobility ◽  
Bulk Heterojunction ◽  
Morphological Evolution ◽  
Domain Size ◽  
S Phase ◽  
Polymer Molecular Weight ◽  
Solvent Interactions ◽  
Polymer Solvent

The morphological evolution is initiated by L–L or L–S phase separation (left) and further developed by molecular mobility, governed by polymer–solvent interactions which determine the final domain size of the BHJ layer (right).

Phase Separation of DMDBS from PP: Effect of Polymer Molecular Weight and Tacticity

2011 ◽  
Vol 44 (7) ◽  
pp. 2358-2364 ◽  
Author(s):  
K. Sreenivas ◽  
Rajeev Basargekar ◽  
Guruswamy Kumaraswamy
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Polymer Molecular Weight

Determining the Role of Polymer Molecular Weight for High-Performance All-Polymer Solar Cells: Its Effect on Polymer Aggregation and Phase Separation

2015 ◽  
Vol 137 (6) ◽  
pp. 2359-2365 ◽  
Author(s):  
Hyunbum Kang ◽  
Mohammad Afsar Uddin ◽  
Changyeon Lee ◽  
Ki-Hyun Kim ◽  
Thanh Luan Nguyen ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Solar Cells ◽  
Phase Separation ◽  
High Performance ◽  
Polymer Solar Cells ◽  
Polymer Molecular Weight

Macroporous polymer beads derived from a novel coporogen of polyethylene/dichlorobenzene

e-Polymers ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 275-282
Author(s):  
Kai Liang ◽  
Gen Li ◽  
Meixuan Peng ◽  
Qingquan Liu
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Surface Morphology ◽  
Pore Structure ◽  
Surface Area ◽  
Early Phase ◽  
Suspension Polymerization ◽  
Weight Percent ◽  
Low Molecular Weight ◽  
Molecular Weights

AbstractMacroporous poly(divinylbenzene) (PDVB) beads were prepared by traditional suspension polymerization in the presence of dichlorobenzene (DCB) and polyethylene (PE) as coporogen. Two types of PE with different molecular weights were used as polymer porogen, and the weight percent of PE in DCB varied from 0 to 8.0 wt%. Effects of PE concentration and PE molecular weight on the pore structure of PDVB beads were investigated. As expected, the highest surface area was achieved by the beads prepared with DCB as the sole porogen. Applying coporogen with PE with low molecular weight (LPE) content, the surface area of PDVB beads declined because of early phase separation induced by the cooperation of LPE and DCB. However, the value increased abruptly when 5 wt% LPE in DCB was used as coporogen. Subsequently, the values again decreased when LPE amount further increased. Overall, the molecular weight of PE and the concentration of PE in coporogen had a significant effect on the pore structure and surface morphology of PDVB beads.

Crystallization of Isotactic Poly(propylene) in Solution as Followed by Slow Calorimetry

1995 ◽  
Vol 60 (11) ◽  
pp. 1905-1924 ◽  
Author(s):  
Hong Phuong-Nguyen ◽  
Geneviève Delmas
Keyword(s):  
Molecular Weight ◽  
Crystal Growth ◽  
High Temperature ◽  
Heat Of Fusion ◽  
Complete Dissolution ◽  
Polymer Molecular Weight ◽  
Solvent Quality ◽  
Temperature Ramp ◽  
Poly Propylene

Dissolution, crystallization and second dissolution traces of isotactic poly(propylene) have been obtained in a slow temperature ramp (3 K h-1) with the C80 Setaram calorimeter. Traces of phase-change, in presence of solvent, are comparable to traces without solvent. The change of enthalpy on heating or cooling, ∆Htotal, over the 40-170 °C temperature range, is the sum of two contributions, ∆HDSC and ∆Hnetwork. The change ∆HDSC is the usual heat obtained in a fast temperature ramp and ∆Hnetwork is associated with a physical network whose disordering is slow and subject to superheating due to strain. When dissolution is complete, ∆Htotal is equal to ∆H0, the heat of fusion of perfect crystals. The values of ∆Htota for nascent and recrystallized samples are compared. Dissolution is the tool to evaluate the quality of the crystals. The repartition of ∆Htotal, into the two endotherms, reflects the quality of crystals. The crystals grown more rapidly have a higher fraction of network crystals which are stable at high T in the solvents. A complete dissolution, i.e. a high temperature (170 °C or more) is necessary to obtain good crystals. The effect of concentration, polymer molecular weight and solvent quality on crystal growth is analyzed.

scholarly journals Hard Coating Materials Based on Photo-Reactive Silsesquioxane for Flexible Application: Improvement of Flexible and Hardness Properties by High Molecular Weight

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1564
Author(s):  
Jong Tae Leem ◽  
Woong Cheol Seok ◽  
Ji Beom Yoo ◽  
Sangkug Lee ◽  
Ho Jun Song
Keyword(s):  
Molecular Weight ◽  
Surface Morphology ◽  
High Molecular Weight ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Coating Materials ◽  
Pencil Hardness ◽  
Coated Film ◽  
Flexible Application

EPOSS of polyhedral oligomeric silsesquioxanes (POSS) mixture structure and LPSQ of ladder-like polysilsesquioxane (LPSQ) structure were synthesized via sol–gel reaction. EPSQ had a high molecular weight due to polycondensation by potassium carbonate. The EPSQ film showed uniform surface morphology due to regular double-stranded structure. In contrast, the EPOSS-coated film showed nonuniform surface morphology due to strong aggregation. Due to the aggregation, the EPOSS film had shorter d-spacing (d1) than the EPSQ film in XRD analysis. In pencil hardness and nanoindentation analysis, EPSQ film showed higher hardness than the EPOSS film due to regular double-stranded structure. In addition, in the in-folding (r = 0.5 mm) and out-folding (r = 5 mm) tests, the EPSQ film did not crack unlike the EPOSS coated film.

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