Synthesis and properties of a spinnable phase change material CDA-IPDI-MPEG

Abstract

A comb like phase change material (PCM) CDA-IPDI-MPEG, based on cellulose diacetate (CDA) as a backbone, with methoxy polyethylene glycol (MPEG) grafted onto it, was synthesized by a two-step reaction in the presence of dibutyltin dilaurate (DBTDL) catalyst system, using acetone as solvent and isophorone diisocyanate (IPDI) as crosslinking reagent. Size exclusion chromatography (SEC) was used to characterize the molecular weight distribution of each step reaction products. Back titration was utilized for determination of free isocyanate. The molecular structures were confirmed qualitatively using FTIR and H1-NMR measurements. Phase change properties were characterized by differential scanning calorimetry (DSC).

Synthesis and performances of novel solid–solid phase change materials with hexahydroxy compounds for thermal energy storage

“…Thus, synthesis of novel SSPCMs with high phase change enthalpy and low phase change temperature is a significant and pressing work. Recently, the preparation and application of polymeric SSPCMs has arose growing interests of considerable scientists [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], and many novel polymeric SSPCMs were obtained by chemical grafting, blocking and crosslinking copolymerization using the solid frameworks as a hard segment and SLPCMs as a soft segment.…”

“…Thus, they are usually used as the phase change functional chains (soft segment) in the molecule of polymeric SSPCMs [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Jiang et al [17] reported a series of SSPCMs by grafting polymerization in which CDA acted as the main chain and PEG with different molecular weights acted as the grafting side chain.…”

Synthesis and characterization of cellulose-g-polyoxyethylene (2) hexadecyl ether solid–solid phase change materials

“…For example, the melting peak temperature of the products of Cheng et al (2008) and Li et al (2009) are 52.9°C and 40.7-60.1°C respectively, while the results of this work are in the range of 28.2-28.6°C. According to the literature, the difference between the melting and crystallization temperatures of CDA-IPDI-MPEG SSPCMs (Cheng et al 2008) is 24.3°C, and that of cellulose-g-MPEG SSPCMs (Li et al 2009) is in the range of 14.7-4.1°C. As can be seen in Table 6, the difference between T mp and T cp of Cellulose-g-E 2 C 16 copolymers is in the range of 13.7-15.3°C.…”

“…The transition temperature and enthalpy of cellulose-g-mPEG could be adjusted by changing the molecular weight and the content of mPEG side chains. Cheng et al (2008) prepared cellulose diacetate-isophorone diisocyanate-poly(-ethylene glycol) monomethyl ether (CDA-IPDI-MPEG) SSPCMs through a two-step reaction and determined its melting enthalpy (DH m ) and crystallization enthalpy (DH c ) to be 25.45 and 24.86 J/g and its melting temperature (T m ) and crystallization temperature (T c ) to be 52.9 and 28.6°C, respectively. Chen et al (2014) systematically investigated the effect of different synthetic pathways on the phase transition behavior of cellulose ethers.…”

“…Previous studies on functional materials of cellulose-based SSPCMs were mainly aliphatic chain, poly(ethylene glycol) (PEG) or MPEG (Li et al 2009;Cheng et al 2008;Chen et al 2014;Lucie et al 2011). Inspired by our previous fundamental research into comb-like polymeric phase change materials (Meng et al 2013a, b), a novel cellulosebased SSPCM was proposed in this study.…”