You Do Need power plug adapter while traveling from Brazil to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B and in Brazil are C and N. This is how they look like.

Brazil

In Brazil, outlets of type C and N are in use.

Type C

Type N

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B