Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

•Medical bottles (MB) had a better pyrolysis performance than did syringes (SY).•Evolved were C4-C24 alkenes/dienes for SY and C6-C41 alkanes/C8-C41 alkenes for MB.•SY and MB pyrolysis ranged from 394.4 to 501 and from 417.9 to 517 °C, respectively.•Mean activation energy of SY and MB devolatilization was 246.5 and 268.51 kJ/mol.•Geometrical contraction and nucleation growth models fitted SY and MB, respectively.