Preparation and characterization of ultra-low molecular weight poly(vinyl alcohol) graft copolymer

2009 ◽  
Vol 113 (6) ◽  
pp. 3954-3962 ◽  
Author(s):  
MinJie Guo ◽  
JianJun Xia ◽  
Zhi Fan ◽  
Zhuo Zhao ◽  
HuaiFeng Mi
Keyword(s):  
Molecular Weight ◽  
Graft Copolymer ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Low Molecular Weight

Self-Healing Hydrogels of Low Molecular Weight Poly(vinyl alcohol) Assembled by Host–Guest Recognition

2018 ◽  
Vol 19 (2) ◽  
pp. 626-632 ◽  
Author(s):  
Yong-Guang Jia ◽  
Jiahong Jin ◽  
Sa Liu ◽  
Li Ren ◽  
Juntao Luo ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Low Molecular Weight ◽  
Self Healing

scholarly journals Low Molecular Weight Oligomers of Poly(alkylene succinate) Polyesters as Plasticizers in Poly(vinyl alcohol) Based Pharmaceutical Applications

Polymers ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 146
Author(s):  
Artemis Palamidi ◽  
Afroditi Kapourani ◽  
Evi Christodoulou ◽  
Panagiotis A. Klonos ◽  
Konstantinos N. Kontogiannopoulos ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Vinyl Alcohol ◽  
Size Exclusion ◽  
Poly Vinyl Alcohol ◽  
Flow Index ◽  
Low Molecular Weight ◽  
Processing Temperature ◽  
Melt Flow ◽  
Flow Properties ◽  
Pharmaceutical Applications

The plasticizing effect of three low molecular weight oligomers of aliphatic poly(alkylene succinate) polyesters, namely poly(butylene succinate) (PBSu), poly(ethylene succinate) (PESu), and poly(propylene succinate) (PPSu), on partially hydrolyzed poly(vinyl alcohol) (PVA) used in melt-based pharmaceutical applications, was evaluated for the first time. Initially, the three aliphatic polyesters were prepared by the melt polycondensation process and characterized by differential scanning calorimetry (DSC), 1H NMR, intrinsic viscosity, and size exclusion chromatography (SEC). Subsequently, their effect on the thermophysical and physicochemical properties of PVA was thoroughly evaluated. According to the obtained results, PVA was completely miscible with all three polyesters, while PESu induced PVA’s thermal degradation, with the phenomenon starting from ~220 °C, in contrast to PBSu and PPSu, where a thermal profile similar to PVA was observed. Furthermore, molecular interactions between PVA and the prepared poly(alkylene succinate) polyesters were revealed by DSC, ATR-FTIR, and molecular dynamics simulations. Finally, melt flow index (MFI) measurements showed that, in contrast to PBSu, the use of PESu or PPSu significantly improved PVA’s melt flow properties. Hence, according to findings of the present work, only the use of low molecular weight PPSu is suitable in order to reduce processing temperature of PVA and improve its melt flow properties (plasticizing ability) without affecting its thermal decomposition.

Electrospinning and characterization of medium-molecular-weight poly(vinyl alcohol)/high-molecular-weight poly(vinyl alcohol)/montmorillonite nanofibers

2009 ◽  
Vol 287 (7) ◽  
pp. 751-758 ◽  
Author(s):  
Hyun Mi Ji ◽  
Hyun Woo Lee ◽  
Mohammad Rezaul Karim ◽  
In Woo Cheong ◽  
Eun A. Bae ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
High Molecular Weight Poly
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