Hindered phenol compound 3,9-bis{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl}- 2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) is a polymorphous material with different physical structures...Hindered phenol compound 3,9-bis{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl}- 2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) is a polymorphous material with different physical structures. The initial AO- 80 is highly crystalline, whereas AO-80 obtained by cooling from its molten state is an amorphous material. Annealing treatment below the melting point of AO-80 results in structural development. The mixture of chlorinated polyethylene (CPE) and vitrified AO-80 particles exhibits a dramatic change in the dynamic mechanical properties during heat treatment at 130'C. This change can be attributed to the decomposition of the vitrified AO-80 particles and the hybridization of two constituents. The vitrified AO-80 particles can crystallize again in a CPE matrix by annealing at 100'C, but this crystal is different from that of the initial AO-80 in its microstructure. In addition, the incorporation of CPE chains caused a dramatic increase in the modulus. As a result, the AO-80 crystal particles that contain some CPE chains act as multifunctional cross- links and the CPE/AO-80 hybrid was found to be a new type of elastomer.展开更多
The foamed polypropylene（PP） with excellent mechanical and thermal insulating properties was reinforced by blending chlorinated polyethylene（CPE）, followed by compression molding foaming in cross-link. The effects...The foamed polypropylene（PP） with excellent mechanical and thermal insulating properties was reinforced by blending chlorinated polyethylene（CPE）, followed by compression molding foaming in cross-link. The effects of CPE on the foaming behavior, thermal and mechanical properties of the foamed PP were studied by the measurements of density, thermal conductivity, Vicat softening temperature, tensile strength, impact strength and SEM. The results showed that the foamed PP got the best properties when the weight ratio of CPE/PP was 20 wt%. The density of the obtained foamed PP was as low as 0.37 g/cm^3, the impact strength was 16.5 kJ/m^2, the tensile strength was 17.7 MPa, the thermal conductivity was 0.035 W/（m·K）, and the Vicat softening temperature was 112 ℃.展开更多
基金This work was financially supported by the "The National High Technology Research and Development Program " of theMinistry of Science and Technology of China (the registered number is 2002AA333020).
文摘Hindered phenol compound 3,9-bis{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl}- 2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) is a polymorphous material with different physical structures. The initial AO- 80 is highly crystalline, whereas AO-80 obtained by cooling from its molten state is an amorphous material. Annealing treatment below the melting point of AO-80 results in structural development. The mixture of chlorinated polyethylene (CPE) and vitrified AO-80 particles exhibits a dramatic change in the dynamic mechanical properties during heat treatment at 130'C. This change can be attributed to the decomposition of the vitrified AO-80 particles and the hybridization of two constituents. The vitrified AO-80 particles can crystallize again in a CPE matrix by annealing at 100'C, but this crystal is different from that of the initial AO-80 in its microstructure. In addition, the incorporation of CPE chains caused a dramatic increase in the modulus. As a result, the AO-80 crystal particles that contain some CPE chains act as multifunctional cross- links and the CPE/AO-80 hybrid was found to be a new type of elastomer.
基金Funded by the National Natural Science Foundation of China(No.51403001)the Key Laboratory of Renewable Energy,Chinese Academy of Sciences(No.y407k31001)the Anhui Provincial Department of Education(No.2013KJS030018)
文摘The foamed polypropylene（PP） with excellent mechanical and thermal insulating properties was reinforced by blending chlorinated polyethylene（CPE）, followed by compression molding foaming in cross-link. The effects of CPE on the foaming behavior, thermal and mechanical properties of the foamed PP were studied by the measurements of density, thermal conductivity, Vicat softening temperature, tensile strength, impact strength and SEM. The results showed that the foamed PP got the best properties when the weight ratio of CPE/PP was 20 wt%. The density of the obtained foamed PP was as low as 0.37 g/cm^3, the impact strength was 16.5 kJ/m^2, the tensile strength was 17.7 MPa, the thermal conductivity was 0.035 W/（m·K）, and the Vicat softening temperature was 112 ℃.
