Temperature Effects on the Crystalline Structure of iPP Containing Different Solvent-Treated TMB-5 Nucleating Agents

TMB-5 nucleating agent (NA) treated by different solvents were used as the -NA of iPP. The effects of temperature on the crystalline structure of different iPP/TMB-5, as well as the crystallization and melting behaviors were investigated. It was found that strong polar solvent treated TMB-5 (TMB-5 and TMB-5 ) could induce more -crystal at high T = 140 °C than the other TMB-5 NAs, while the -crystal inducing efficiency of untreated TMB-5 (TMB-5 ) and non-polar solvent treated TMB-5 (TMB-5 ) is seriously reduced at high T = 140 °C. TMB-5 can induce a high and stable content of -crystal with K = 83-94% within T = 90-140 °C, and TMB-5 can induce a high content of -crystal with K > 91.3% within T = 90-130 °C. TMB-5 is the most temperature-sensitive one, but can induce a high fraction of -crystal with K > 92% both at low T = 90 °C and high T = 140 °C. High temperature pre-crystallization at T = 150 °C tremendously reduces the -crystal inducing efficiency of all TMB-5 NAs. TMB-5 and TMB-5 exhibit higher nucleating efficiency than TMB-5 , TMB-5 and TMB-5 . During the non-isothermal crystallization process, TMB-5 induced -crystal possesses higher structural perfection and stability, while TMB-5 is more likely to induce -crystal with considerable quantity and stability. The structural perfection and stability of TMB-5 induced -crystal can be enhanced with appropriate increasing of T .