\begin{itemize}
\item Neoprene is a synthetic rubber formed by addition polymerization of chloroprene — it's a homopolymer.
\item Natural rubber is also a homopolymer, not a copolymer.
\item Nylon 6,6 is a condensation polymer, but it's a copolymer, not a homopolymer.
\item Nylon 6 is a homopolymer from caprolactam.
\end{itemize}