MORPHOLOGY OF VULCANIZED EPDM/PP BLEND THERMOPLASTIC ELASTOMERS

• 作 者: 殷敬华 周恩乐 金桂萍 纪锋 黄葆同
• 机 构: Changchun Institute of Applied Chemistry, Academia Sinica,Changchun Institute of Applied Chemistry,
• 出 处: Science in China,Ser.B
• 发表日期: 1986年12期
• 关键词: blends rubber dissolved latter blend stained plasticity have challenge predomina

Dynamic vulcanization of rubber in rubber/plastic blend thermoplastic elastomers poses challenge to the traditional concept on morphology of thermoplastic elastomers. TEM and SEM micrographs of OsO_4-stained samples and samples with EPDM dissolved by heptane or etched with CrO_3/H_2SO_4 reveal that the blends with uncrosslinked EPDM have a predominant component as the continuous phase, while the blends with crosslinked EPDM always have PP as the continuous phase even at R/P>50/50. In the latter case, crosslinked EPDM exists as the micro-domains imbedded in the PP matrix. This explains the plasticity and higher strength of the crosslinked blends.

Dynamic vulcanization of rubber in rubber / plastic blend thermoplastic elastomers poses challenge to the traditional concept on morphology of thermoplastic elastomers. TEM and SEM micrographs of OsO 4 -stained samples and samples with EPDM dissolved by heptane or etched with CrO 3 / H 2 SO 4 reveal that the blends with uncrosslinked EPDM have a predominant component as the continuous phase, while the blends with crosslinked EPDM always have PP as the continuous phase even at R / P> 50/50. In the latter case, crosslinked EPDM exists as the micro-domains imbedded in the PP matrix. This explains the plasticity and higher strength of the crosslinked blends.