beta-nucleated　long　chain　branched　(LCB)　polypropylene　random　copolymers　(PPRs)　were　prepared　via　reactive　extrusion　by　introducing　beta　nucleating　agent　(NA),　dicumyl　peroxide　(DCP)　and　various　contents　of　1,　6-Hexanediol　diacrylate　(HDDA)　into　PPR.　Results　of　Fourier　infrared　spectroscopy　(FTIR)　and　the　rheological　properties　demonstrate　the　existence　of　LCB　polypropylene.　Mechanical　properties　including　impact　strength,　tensile　strength　and　elongation　at　break　were　studied.　The　crystal　structure,　morphology　and　crystallization　behavior　were　investigated　via　wide-angle　X-ray　diffraction　(WARD),　polarized　light　microscopy　(PLM)　and　differential　scanning　calorimetry　(DSC).　Non-isothermal　crystallization　kinetics　using　the　Jeziorny　method　was　also　studied.　The　results　show　an　increased　LCB　degree　with　increasing　HDDA　amount　For　the　sample　with　a　moderate　LCB　level,　synergistic　toughening　effect　of　NA　and　LCB　is　achieved　without　deterioration　of　yield　strength　or　elongation　at　break,　partially　because　of　its　higher　beta-phase　content　and　much　smaller　spherulite　size.　It　exhibits　the　minimum　values　of　T-c　and　Z(c1),　and　the　maximum　values　of　t(1/2)　and　n(1)　in　the　primary　stage　of　crystallization,　regardless　of　the　cooling　rate,　indicating　a　slower　crystallization　rate　and　more　complicated　nucleation　and　crystal　growth　model.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.