You Do Need power plug adapter while traveling from Puerto Rico to Thailand.

Here is Why You Need An Adapter

The outlet and plug type used in Thailand are A, B, C and O and in Puerto Rico are A and B. This is how they look like.

Puerto Rico

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B

Thailand

In Thailand, outlets of type A, B, C and O are in use.

Type A

Type B

Type C

Type O