The TPV with PhSP-PE also provided small vulcanized rubber domains but they are marginally larger than that of the TPV with PHHRJ-PE. This may be attributed to different types of linkages between the phenol units. The SP-1045 (PhSP-PE) molecules consist of methylene and ether bridges as shown inScheme 2, while the HRJ-10518 molecules consist of only methylene bridges as shown in Scheme 1. Also, the SP-1045 contains a higher number of phenolic units in the molecules. The ether linkages and the length of the molecules might cause slight weakness of the TPV with the PhSP-PE.