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以辛酸亚锡为催化剂,季戊四醇(PTOL)为引发剂,引发对二氧环己酮(PDO)单体开环聚合,合成了以PTOL为核的四臂聚对二氧环己酮(4s-PPDO).通过直接将4s-PPDO预聚物和聚乙二醇(PEG)于熔点以上、惰性气体保护下与偶联剂甲苯二异氰酸酯(TDI)交联共聚得到聚对二氧环己酮/聚乙二醇(PPDO-b-PEG)两亲性共网络聚合物(PPDO-PEG APCNs).研究了两亲性聚合物共网络结构、配比组成、溶剂种类等对聚合物溶胀率的影响,结果表明APCNs在不同类型的溶剂中表现出不同的溶胀行为,可以通过调节偶联剂的用量及PPDO/PEG的投料比来满足不同的实际需求.通过示差扫描量热分析(DSC)详细研究APCNs的结晶性能,证实交联反应降低APCNs的结晶度和结晶尺寸.
Using stannous octoate as a catalyst and pentaerythritol (PTOL) as initiator, a ring-opening polymerization of dioxanone (PDO) was initiated and a four-arm polydioxanone (PT) PPDO) by directly 4s-PPDO prepolymer and polyethylene glycol (PEG) above the melting point, under the protection of inert gas and the coupling agent toluene diisocyanate (TDI) cross-linked to obtain polydioxanone / (PPDO-b-PEG) amphiphilic co-network polymers (PPDO-PEG APCNs). The influence of the amphiphilic polymer network structure, the ratio of composition, solvent type on the swelling rate of the polymer , The results showed that APCNs exhibited different swelling behavior in different types of solvents and the different actual needs could be met by adjusting the amount of coupling agent and the feed ratio of PPDO / PEG.Detailed studies by differential scanning calorimetry (DSC) The crystallization behavior of APCNs confirms that the cross-linking reaction reduces the crystallinity and crystal size of APCNs.