The cellulose-based acrylate (CA) was prepared under heterogeneous conditions using cotton as the support material and acryloyl chloride as an intermediate; the cellulose-based solid-solid phase change fibers (solid-solid phase change fibers

SSPCFs) with controlled hydrophobicity were then grafted with hydrophobic octadecyl acrylate (A18)

hydrophilic polyethylene glycol monomethyl ether methacrylate (OEGMA) and their copolymers by free radical polymerisation using benzoyl peroxide (BPO) as initiator. The structural and thermal properties of the SSPCFs were characterized by Fourier transform infrared spectroscopy (FTIR)

differential scanning calorimetry (DSC)

thermogravimetric analysis (TG) and X-ray diffraction (XRD); the morphology of the graft copolymers was investigated by morphological stability tests at different temperatures; finally

the hydrophobicity of the phase change fibers was investigated by water contact angle tests. The results show that: A18 and OEGMA were successfully grafted onto the cellulose surface to prepare solid-solid phase change materials with certain energy storage properties; the initial decomposition temperatures of the five CA-

g

-P(A18-

co

-OEGMA) copolymers were among 348-368 ℃

all of which were higher than the initial decomposition temperature of CA

increasing the thermal stability of the cellulose-based products; The water contact angle of the graft copolymers decreased gradually with increasing OEGMA content

showing a progressive hydrophilic state. The controlled hydrophobicity of the CA-

g

-P(A18-

co

-OEGMA) copolymer was illustrated; at the same time the latent heat of fusion of its graft copolymer gradually decreased; the phase change fibers maintained good morphological stability at 70 ℃

indicating the successful preparation of morphologically stable cellulose-based SSPCFs.