Cellulose/poly(vinyl alcohol) blends: an estimation of thermodynamic polymer-polymer interaction by melting-point-depression analysis

Compatibility of the blends of polyamide 6 (PA6) and polyvinylpyrrolidone (PVP) was investigated by solution viscosity measurement, melting point depression and morphological analysis. The viscosity data were discussed by using ΔB and Δb criteria [Formula: see text], where b11 b22 and b12 characterize the interactions between polymer molecules (1-1, 2-2 and 1-2), respectively. ΔB and □b ≥ 0, miscible; ΔB and Δb < 0, immiscible). From melting point data of the PA6 component, the polymer-polymer interaction parameter χ12 = −0.069 was derived through the simplified Nishi-Wang equation. The results revealed that PA6 formed a partially compatible blend with PVP. This conclusion was further evidenced by morphological analysis.

Download Full-text

Ceramic coated polypropylene separators for lithium-ion batteries with improved safety: effects of high melting point organic binder

RSC Advances ◽

10.1039/c6ra04522g ◽

2016 ◽

Vol 6 (46) ◽

pp. 40002-40009 ◽

Cited By ~ 20

Author(s):

Linghui Yu ◽

Yi Jin ◽

Y. S. Lin

Keyword(s):

Melting Point ◽

Lithium Ion Batteries ◽

Vinyl Alcohol ◽

High Performance ◽

Lithium Ion ◽

Organic Binder ◽

Poly Vinyl Alcohol ◽

High Melting ◽

High Melting Point

A study on Al2O3/poly(vinyl alcohol) coated polypropylene separators is presented providing insights into designing high-performance LIB separators with improved safety.

Download Full-text

Characterization of dual nano-size effects of ACC-cellulose nanofibrils on crystallization behavior of hydrophilic poly(vinyl alcohol)

Journal of Wood Science ◽

10.1186/s10086-021-01957-9 ◽

2021 ◽

Vol 67 (1) ◽

Author(s):

Gento Ishikawa ◽

Tetsuo Kondo

Keyword(s):

Size Effects ◽

Vinyl Alcohol ◽

Crystallization Behavior ◽

Cellulose Nanofibrils ◽

Nucleating Agent ◽

Melting Point Depression ◽

Poly Vinyl Alcohol ◽

Thermodynamic Evaluation ◽

Aqueous Mixtures ◽

Nano Size

AbstractThis study attempts to clarify thermodynamic quantification on interaction between poly(vinyl alcohol) (PVA) and wood-derived cellulose nanofibrils (CNFs) obtained by aqueous counter collision (ACC) method. Aqueous mixtures of PVA/ACC-CNFs with various fiber widths were cast as the target materials. The interfacial interactions between the two components were characterized through thermodynamic evaluation of the crystalline PVA component as a probe in the cast mixture. As the result, surface properties of the ACC-CNFs found to reflect on the crystallization behavior of the interacted PVA component, resulting in dual nano-size effects of either diluent or nucleating agent. Melting point depression behaviors of the PVA component indicated that ACC-CNFs with thinner widths induced nucleation effects on PVA crystallization, whereas ACC-CNFs with ca. 100 nm in width encouraged diluent effects on PVA components. It is noted that this trend found to be reverse to the case for PVA/ACC-CNFs of bacterial nanocellulose previously reported.

Download Full-text