Preparation of in-reactor polyolefin alloy by Reactor Granule Technology provides an effective method for the design and modification of new polyolefin materials. In this work

two pilot-scale polypropylene (PP)/polybutene-1(PB-1) in-reactor alloys prepared based on reactor granule technology with the two-stage polymerization technology were fractionated with solvent extraction fractionation and temperature rising elution fractionation. By using differential scanning calorimeter (DSC)

high temperature nuclear magnetic carbon spectrum (

13

C-NMR) and high temperature gel permeation chromatograph (GPC)

the structure and composition

especially the composition and distribution

chain sequence structure and distribution of the PP/PB-1 in-reactor alloy and its fractions were further clarified. The relationship between the composition and properties of two alloys was studied. This study is of great significance for the optimization of polymerization process and the development of advanced polyolefin materials.