Poly (ethylene Terephthalate), Swelling Polymerization

GrM Wan-' swior WuDactwIn orfor to obtain h~ tnoledar wetrit POly (~lode thePhthaleqme swoncn-bo POlymedfor (swsP) Of PET in granular fOnn wa8 eded oNinboheql and dtwl ethyle m~e (26/74 v/v) as the swdsg soha ThewhucoQc Of tcW thc solUbilhe pmeter and ttle ~cle 8ize on thcswctheg of PET was dirmssod. W factors that influcocc'1 on thc wh bo ofthe SwSP Of PET, SUch as bo~, thc amount Qf catalyst (Sb2O3), thc dpe ofcrystitilization, and dle eatanglrmont Ol molcGu1itr chain, bad beco invcsIigated. Amathematical model sAnPlified for the SwSP of PET was PrMd, and thedthercoGe between the SwSP and the solid~statc lw1ymerzatiOn (SSP) Of PET washobo.It was foUn Ihat the sweimg of PET was strOngl3 dapcodent on ~~ -the sohoility peameter of sobot and the pndlc size Of reT The dgu OfswcUing of PET (thc nd Oftwgnbo solvont in swollm PET) inereased withthe inereasing tCmpe and dereeasing particle size. PET Pellcts wer 8woUen inthe solvcot Whose solubility parameter tvas cqual ilt'lvoximatel} t') that O1 PET botwerc dissoived QOmPletely if theperatorc w3s beyond 2(tot So1ubility parametcr. -.coul(1 bc cslAnatcd by Van Krtwbo's mctl1o(l. In Ihis paP(:r thc highcst dcgrcc OfstveUing wi)s 7opedt).Il was 8hown in copbocotal rcsu1Ls IJ1ilt ibc l-cilction ratc was edlanccd by sochfortors as the addition of c~st (1 Sb,(:)f,:j t(). ti1e solvcnt thc low degne ofurysta1lization, and the high degree ()f' swclIing. At onc Of the best rcactiOnconditions, the nUmer-averagc moleCuar wcight of PET incrcand frOm 18000 to3O2(D forg 4 hours. HOWmp the cntanglamont of molcndar - caused thedccrease of reAnon fate with ttle increasing time. It is considered that the raPidinerease in averagc moleeular wcwht duhog Ulc S\vSP can be ched tO thcinGrcasc in the frec volume among molecular chains, thc fas dme8bo ofcondcoSates and the inoreascd mObility Of reaGtive chain end8. Thc c~lconrmtraion decreased fag during the SwSP and the pojymer bo bad bomoleGfor wcight in compwt with thc SSP Of PE'L The kinctic modcl was fOUndtO be in agreetnent with the exPerbocot results, and it could be used tO Pndict thechanges Of thc H QonMatiOn and the mOletalar wedt..