Effects of Size and Specific Surface Area of Boron Nitride Particles on the Crystallization of Bacterial Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Summary Three different grades of Boron Nitride (BN) powder (BN NX1, BN NX5 and BN HCV) having different mean particle size (0.7 to 11 μm) and specific surface area (16 to 40 m2 · g−1) were used as nucleating agents for poly (3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) at a fixed concentration of...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecular symposia. 2013-06, Vol.328 (1), p.8-19
Main Authors: Puente, Jorge Arturo Soto, Esposito, Antonella, Chivrac, Frédéric, Dargent, Eric
Format: Article
Language:English
Subjects:
Acetal resins
Bacteria
Boron nitride
Condensed Matter
Crystallization
Differential scanning calorimetry
Engineering Sciences
Hepatitis C virus
Joining
Materials
Materials Science
particle size
Physics
poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
Soft Condensed Matter
Specific surface
spherulites
Supercooling
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Summary Three different grades of Boron Nitride (BN) powder (BN NX1, BN NX5 and BN HCV) having different mean particle size (0.7 to 11 μm) and specific surface area (16 to 40 m2 · g−1) were used as nucleating agents for poly (3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) at a fixed concentration of 2 wt %. Polarized Optical Microscopy (POM) observations, coupled to Differential Scanning Calorimetric (DSC) measurements, allowed to monitor both the isothermal and non‐isothermal crystallization of neat and nucleated PHBVs. It was found that the addition of BN to PHBV modifies the mechanisms of crystallization by starting it at lower supercooling degrees and reducing the half‐crystallization time. This work proved that DSC can replace POM whenever POM does not allow to estimate directly the average linear growth rate of the spherulites during crystallization. The Hoffman‐Lauritzen theory was used to explain the effects of the addition of different grades of BN on PHBV crystallization. As a result, a transition from growth regime III to the growth regime II could be observed for nucleated PHBVs, no matter the grade of BN added. It was evidenced that the coupling between the amorphous and the crystalline phase is modified by the presence of the BN particles. In particular, for a given concentration of nucleating agent, it is the mean size and the specific surface area of BN particles that affect PHBV crystallization.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.201350601