CAJ | 학술논문

采用大分子单体技术合成了一系列以聚乙二醇为支链、甲基丙烯酸六氟丁酯为主链的含氟两亲接枝共聚物(PHFMA-g-PSPEG).用~1H NMR和凝胶色谱(GPC)对制备的大分子单体和两亲接枝共聚物的结构进行了表征.利用示差扫描量热法(DSC)、X射线衍射(XRD)和偏光显微镜(POM)测试技术对含氟两亲接枝共聚物的结晶行为进行了研究.DSC和XRD结果表明,随着共聚物中含氟链段质量分数的增加,其结晶温度(T_c)和结晶度(X_c)均降低,而结晶熔融温度(T_m)先减小后增加.POM发现,随着共聚物中含氟链段质量分数的增加,其结晶速度减慢,共聚物形成清晰球晶的能力减弱,当共聚物中含氟链段质量分数为57%时,含氟两亲接枝共聚物已不能形成清晰的球晶.
채용대분자단체기술합성료일계렬이취을이순위지련、갑기병희산륙불정지위주련적함불량친접지공취물(PHFMA-g-PSPEG).용~1H NMR화응효색보(GPC)대제비적대분자단체화량친접지공취물적결구진행료표정.이용시차소묘량열법(DSC)、X사선연사(XRD)화편광현미경(POM)측시기술대함불량친접지공취물적결정행위진행료연구.DSC화XRD결과표명,수착공취물중함불련단질량분수적증가,기결정온도(T_c)화결정도(X_c)균강저,이결정용융온도(T_m)선감소후증가.POM발현,수착공취물중함불련단질량분수적증가,기결정속도감만,공취물형성청석구정적능력감약,당공취물중함불련단질량분수위57%시,함불량친접지공취물이불능형성청석적구정.
A series of amphiphilic graft copolymers P(SPEG)-g-P(HFMA) comprising poly(hexafluorobutyl methacrylate)(PHFMA) backbones and poly(ethylene glycol)(PEG) side chains was synthesized via a macromonomer method. The resultant macromonomer and amphiphilic graft copolymers were characterized by ~1H NMR and GPC spectroscopy. The crystallization of P(SPEG)-g-P(HFMA) was studied by differential scanning calorimetry(DSC),X-ray diffraction(XRD) and polarized optical microscopy(POM). DSC and XRD measurements indicated that the crystallizing temperature(T_c) and crystallinity(X_c) of the copolymer all decreased with the increase of HFMA content in the graft copolymer. The melting temperature(T_m) of the amphiphilic graft copolymer first decreased appropriately and then increased with the increase of HFMA content in the graft copolymer. POM micrographs showed that the crystal rate of the graft copolymer decreased and the PEG phase had a decreasing tendency for spherical crystallization and less clear spherical structure as the HFMA content in the graft copolymer increased. When the HFMA content in the graft copolymer was 57%,no clear crystalline was found.