New kinds of solid-solid phase change materials(PCMs) with netted structure have been prepared.In these materials

a flexible polymer PEG (polyethylene glycol) has been taken as functional branches

with which the energy storage and energy release can be proceeded by phase transition between its crystal state and amorphous state.And a rigid polymer CDA (cellulose diacetate) has been taken as skeleton

which ensures the solid-nature of PCMs during the phase transition.IR

X-ray

TG

DSC

TEM

polarizing microscopy and so on were used to study the structure and properties of PCMs.The former studies showed that these new PCMs have typical colid-solid phase transformation property

quite good energy storage effect and have better thermal stability.In this paper

the effects of molecular weight and weight percentage of PEG in composition on energy storage properties were discussed in detail.The results showed that PEG in composition on energy storage properties were discussed in detail.The results showed that PCMs with different latent heat

different phase transition temperature and different mechanical strength can be obtained by means of modifying the molecular weight and weight percentage of PEG.