diff --git a/polyply/data/2016H66/polyether_polyvinyl_links.ff b/polyply/data/2016H66/polyether_polyvinyl_links.ff
index f691ac9b..04e95fb8 100644
--- a/polyply/data/2016H66/polyether_polyvinyl_links.ff
+++ b/polyply/data/2016H66/polyether_polyvinyl_links.ff
@@ -63,17 +63,57 @@ resname $PEO_VINYL_RES
 [ atoms ]
 VC1 { }
 VC2 { }
-SC3 { }
+SC1 { }
 +EC1 { }
 +O1 { }
 +EC2 { }
 [ angles ]
-SC3 VC1 +EC1 ga_15 {"comment":"CHn-CHn-C,CHn,OA,OE,NR,NT,NL", "group":"link"}
+SC1 VC2 +EC1 2 ga_15 {"comment":"CHn-CHn-C,CHn,OA,OE,NR,NT,NL", "group":"link"}
+[ pairs ]
+SC1 +O1 1 { "group": "link" }
+[ edges ]
+VC1 VC2
+VC2 SC1
+VC2 +EC1
++EC1 +O1
++EC1 +EC2
+;
+[ link ]
+; side chain substiuent vinyl -> ether
+resname $PEO_VINYL_RES
+[ atoms ]
+VC1 { }
+VC2 { }
+SC1 { }
+SC2 { }
++EC1 { }
++O1 { }
++EC2 { }
+[ pairs ]
+SC2 +EC1 1 { "group": "link" }
+[ edges ]
+VC1 VC2
+VC2 SC1
+SC1 SC2
+VC2 +EC1
++EC1 +O1
++EC1 +EC2
+;
+[ link ]
+; side chain substiuent vinyl PMMA like -> ether
+resname $PEO_VINYL_RES
+[ atoms ]
+VC1 { }
+VC2 { }
+SB1 { }
++EC1 { }
++O1 { }
++EC2 { }
 [ pairs ]
-SC3 +O1 1 { "group": "link" }
+SB1 +O1 1 { "group": "link" }
 [ edges ]
 VC1 VC2
-VC2 SC3
+VC2 SB1
 VC2 +EC1
 +EC1 +O1
 +EC1 +EC2
@@ -87,16 +127,35 @@ O1 { }
 EC2 { }
 +VC1 { }
 +VC2 { }
-+SC3 { }
++SC1 { }
 [ pairs ]
-EC2 +SC3 1 { "group": "link" }
+EC2 +SC1 1 { "group": "link" }
 [ edges ]
 EC1 O1
 O1 EC2
 EC2 +VC1
 +VC1 +VC2
-+VC2 +SC3
-
++VC2 +SC1
+;
+[ link ]
+; side PMMA like chain substiuent ether -> vinyl
+resname $PEO_VINYL_RES
+[ atoms ]
+EC1 { }
+O1 { }
+EC2 { }
++VC1 { }
++VC2 { }
++SB1 { }
+[ pairs ]
+O1 +SB1 1 { "group": "link" }
+[ edges ]
+EC1 O1
+O1 EC2
+EC2 +VC1
++VC1 +VC2
++VC2 +SB1
+;
 [ link ]
 resname $PEO_VINYL_RES
 ; vinyl -> vinyl -> ether
diff --git a/polyply/data/2016H66/polyvinyl_blocks.ff b/polyply/data/2016H66/polyvinyl_blocks.ff
index 6d873158..a7580acc 100644
--- a/polyply/data/2016H66/polyvinyl_blocks.ff
+++ b/polyply/data/2016H66/polyvinyl_blocks.ff
@@ -286,7 +286,7 @@ PMAM 3
 5  N   1 PMAM SC3 5 -0.76 14.0067
 6  H   1 PMAM SC4 6  0.38 1.0080
 7  H   1 PMAM SC5 7  0.38 1.0080
-8  CH3 1 PMMA SB1 6  0.00 15.0350
+8  CH3 1 PMAM SB1 6  0.00 15.0350
 [ bonds ]
 1 2 2 gb_27 {"comment":"C,CHn-CHn,C"}
 2 3 2 gb_27 {"comment":"C,CHn-CHn,C"}
@@ -318,7 +318,6 @@ PMAM 3
 1 5 1
 2 6 1
 2 7 1
-5 7 1
 8 4 1
 8 5 1
 4 6 1 {"ifndef": "eq_polyply", "version": "1"}