lets say that within minutes of learning he has been elected potus Lincoln begins to advocate immediate uncompensated emancipation. what would be the results of this.
If you mean "on the evening of Election Day", or early the next morning... Lincoln never becomes President. There would be an emergency meeting of Republican leaders within a few days, and the Republican electors would all be instructed to vote for someone else. Not Seward, but some anodyne figure who was sound on Free Soil but was beyond all doubt
not an Abolitionist. Nearly all the Republican electors would go along with this. I'm sure there were many who were Abolitionists themselves, but even those would agree that "immediate uncompensated emancipation" was politically impossible, and that attempting it, or even advocating it as party policy would provoke secession in every slave state.
Many would be profoundly angry and disappointed with Lincoln for having concealed his "true views" when he was seeking the nomination and as the Republican candidate. Others would wonder whether Lincoln had gone mad, or had some religious brainstorm.
Even after the public repudiation of Lincoln by the Republican Party, there would still be grave danger. Many Southerners would be alarmed. The Fire-Eaters would argue that Lincoln was the real voice of the Republicans - that any subsequent post-election maneuvers were masquerade - and who could be sure they weren't right? This might be enough to tip the Upper South into declaring secession immediately.It would also strengthen secessionism in Kentucky, Missouri, Maryland, and Delaware.
Another likely consequence would be a very weak position for President-elect Anodyne. OTL, Lincoln came under great pressure to agree to the "compromise" proposals being put forward to head off secession. Anodyne would be under even greater pressure; from Southern Unionists, and from panicky Northerners, both desperate for him to do whatever was needed to reassure the South.
Anodyne would probably endorse Crittenden's Compromise, with the public support of most Republicans. Lincoln insisted that he must make no concessions: that if he gave up the Republican platform's ban on slavery in all Territories for "popular sovereignty", the South would "hold fast, pull in the slack" and demand Crittenden's Compromise; that conceded, they would "pull in the slack" again, demanding the "Border State Compromise"; that given, they would want "all that South Carolina asks".
Lincoln's incendiary election-night announcement would force Anodyne and the Republicans to start down that path, and as Lincoln realized, it would be very hard to stop halfway. Indeed, the mere replacement of Lincoln by Anodyne might not seem to be enough. Many Republicans might even doubt the good faith of the party leadership which had campaigned for Lincoln - what if they had known all along that he was a radical? Better to abandon such a party which they had joined only a few years before.
So there might be a move for Republican electors to vote for John Bell. Bell was after all an ex-Whig, like most Republicans.