I recently had problems with the text justification. Most of these have been resolved by the simple adding of the microtype package. However, I still have one broken justification in my text:

enter image description here

I really don't understand how to solve this problem. Here is my preamble and the example:


\usepackage[top=3cm, bottom=2cm, left=2.5cm, right=2.5cm]{geometry} 
\usepackage{gensymb} % degree symbol in text

\usepackage{microtype} % line break justification fix

% exponent citation

% font 'utopia'

% greek letters in text mode

\usepackage[justification=centering,font=small]{caption} % caption center and small font
\usepackage{titlesec} % title sizes

% title sizes

% coloring refs




Aziridines compounds can be exploited for the direct copolymerization with 
CO\textsubscript{2} into polyurethanes. This route is not the most explored and 
remains not well understood in all its aspects. A mechanism has nonetheless 
been proposed to explain the polymerization process.


Thanks for your help

  • 1
    Welcome to TeX.SE. Please edit your posting to provide a case of an bad line break. – Mico Jun 2 '19 at 13:53
  • 3
    TeX fails to hyphenate the word polyurethanes properly, I guess you will have to help it: Either with explicit \- at possible break points poly\-urethanes or with \hyphenation{poly-urethanes} (I don't know where to hyphenate urethanes, so I'll leave that to you, but you should probably add a hyphenation point for that part of the word as well). – moewe Jun 2 '19 at 14:06
  • 1
    Possibly better, \hyphenation{poly-ure-thanes}. – egreg Jun 2 '19 at 14:07
  • 2
    You may want to look into mhchem or chemmacros to typeset CO2 and other chemical formulae more nicely. See tex.stackexchange.com/q/145838/35864, tex.stackexchange.com/q/480391/35864 – moewe Jun 2 '19 at 14:13

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