A polyphenylene ether oligomer and a polyphenylene ether oligomer are provided. The polyphenylene ether oligomer has a structure represented by Formula (I): wherein each R1 can be independently hydrogen, C1-6 alkyl group, or phenyl group; each R2 can be independently hydrogen, C1-6 alkyl group, or phenyl group; a:(a+b) is from 0.05:1 to 1:1; n:(a+b) is from 0.05:1 to 5:1; Q can be m can be 0 or an integer from 1 to 4; Ra can be C1-6 alkylene group; Rb can be C1-6 alkylene group; each X is independently hydrogen, acryloyl group, allyl group, vinylbenzyl group, epoxypropyl group, methacryloyl group, propargyl group, or cyanol group; and wherein the polyphenylene ether oligomer can have a number average molecular weight from 400 to 2,000.