A polymer custom element that can load requirejs modules. You may have to modify the paths to suite your setup.

requirejs-shim-polymer-element

<polymer-element name="require-js" attributes="libnames event">
<script>
(function() {
  // Helper function to add a script.
  var addScript = function(src) {
    var script = document.createElement('script');
    script.src = src;
    var s = document.querySelector('script');
    s.parentNode.insertBefore(script, s);
    return script;
  };
  // Add the requireScript to the dom.
  var requireScript = addScript("/js/require-jquery.js");
  requireScript.onload = function() {
    // Once the require script has loaded then configure our base url
    require.config({
      baseUrl: "/js/"
    });
    // And construct the polymer element.
    Polymer('require-js', {
      // space seperated list of libs to load using requirejs
      libnames: "",
      // name of the event to fire when the libs are loaded.
      event: "require-js-loaded",
      created: function() {
        var self = this;
        // the below only makes sense if there is a non-empty libnames
        if (self.libnames != "") {
          // Split the list and pass that as an argument to the require function
          var libList = self.libnames.split(" ");
          require(libList, function() {
            var libs = {};
            // marshall the returned libs into a container
            for (idx in libList) {
              libs[libList[idx]] = arguments[idx];
            }
            // fire the event method with the libs as a payload
            self.fire(self.event, {libs: libs})
          });
        }
      }
    });
  };
})();
</script>
</polymer-element>