Dispersity under Scrutiny: Phase Behavior Differences between Disperse and Discrete Low Molecular Weight Block Co-Oligomers | Zendy

Bas van Genabeek | Zendy; Bas F. M. de Waal | Zendy; Bianca Ligt | Zendy; Anja R. A. Palmans | Zendy; E. W. Meijer | Zendy

Open Access

Dispersity under Scrutiny: Phase Behavior Differences between Disperse and Discrete Low Molecular Weight Block Co-Oligomers

Author(s) -

Bas van Genabeek,

Bas F. M. de Waal,

Bianca Ligt,

Anja R. A. Palmans,

E. W. Meijer

Publication year - 2017

Publication title -

acs macro letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.966

H-Index - 92

ISSN - 2161-1653

DOI - 10.1021/acsmacrolett.7b00266

Subject(s) - dispersity , scrutiny , phase (matter) , materials science , block (permutation group theory) , polymer chemistry , chemical engineering , chemical physics , polymer science , chemistry , organic chemistry , mathematics , engineering , law , combinatorics , political science

An experimental study is presented in which we compare the bulk phase behavior of discrete and (partially) disperse diblock co-oligomers (BCOs) with high χ-low N . To this end, oligomers of dimethylsiloxane ( o DMS) and lactic acid ( o LA) were synthesized, each having either a discrete number of repeat units or a variable block length. Ligation of the blocks resulted in o DMS- o LA BCOs with dispersities ranging from <1.00001 to 1.09, as revealed by mass spectroscopy and size exclusion chromatography. The phase behavior of all BCOs was investigated by differential scanning calorimetry and small-angle X-ray scattering. Compared to the well-organized lamellae formed by discrete o DMS- o LA, we observe that an increase in the dispersity of these BCOs results in (1) an increase of the stability of the microphase-segregated state, (2) a decrease of the overall degree of ordering , and (3) an increase of the domain spacing .

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research