Fig. 14 shows SEM micrographs of the xylene extracted surface of the MNR/HDPE TPVs with five loading levels of the PhHRJ-PE compatibilizer. It is clear that the TPV with PhHRJ-PE at 5 wt% of HDPE produced the smallest vulcanized rubber particles and cavitations after the HDPE was extracted. The TPVs with higher and lower loading levels of PhHRJ-PE than 5 wt% of HDPE gave larger rubber domains and bigger cavitations.