  In this paper, we are concerned with the impulsive Duffing equation $$
x''+x^{2n+1}+\sum_{i=0}^{2n}x^{i}p_{i}(t)=0,\ t\neq t_{j}, $$ with impulsive
effects $x(t_{j}+)=x(t_{j}-),\ x'(t_{j}+)=-x'(t_{j}-),\ j=\pm1,\pm2,\cdots$,
where the time dependent coefficients $p_i(t)\in C^1(\mathbb{S}^1)\ (n+1\leq
i\leq 2n)$ and $p_i(t)\in C^0(\mathbb{S}^1)\ (0\leq i\leq n)$ with
$\mathbb{S}^1=\mathbb{R}/\mathbb{Z}$. If impulsive times are 1-periodic and
$t_{2}-t_{1}\neq\frac{1}{2}$ for $0< t_{1}<t_{2}<1$, basing on a so-called
large twist theorem recently established by X. Li, B. Liu and Y. Sun in
\cite{XLi}, we find large invariant curves diffeomorphism to circles
surrounding the origin and going to infinity, which confines the solutions in
its interior and therefore leads to the boundedness of these solutions.
Meanwhile, it turns out that the solutions starting at $t=0$ on the invariant
curves are quasiperiodic.
