CAJ | 학술논문

要:?通过亲核取代反应制备了可侧链结晶的梳型接枝聚氯乙烯(PVC),利用傅里叶变换红外光谱、核磁共振氢谱和凝胶渗透色谱表征了梳型接枝PVC的结构,采用差示扫描量热法研究了接枝率与侧链长度对侧链结晶行为、熔融行为及玻璃化转变温度(tg)的影响.本研究方法可有效地将长链烷基接枝到PVC骨架上,并形成侧链结晶.侧链结晶的熔融焓和熔融温度随接枝率的增大而增大,随侧链的增长而减小.tg随接枝率的增大先降后增,连接含有较长侧链的PVC的tg?明显高于不含侧链的PVC.
요:?통과친핵취대반응제비료가측련결정적소형접지취록을희(PVC),이용부리협변환홍외광보、핵자공진경보화응효삼투색보표정료소형접지PVC적결구,채용차시소묘량열법연구료접지솔여측련장도대측련결정행위、용융행위급파리화전변온도(tg)적영향.본연구방법가유효지장장련완기접지도PVC골가상,병형성측련결정.측련결정적용융함화용융온도수접지솔적증대이증대,수측련적증장이감소.tg수접지솔적증대선강후증,련접함유교장측련적PVC적tg?명현고우불함측련적PVC.
@@@@?Comb-like?poly(vinyl?chloride)?(PVC)?grafted?with?crystallizable?side?chains?was?synthesized?by?nucleophilic?substitution?reaction.?Its?structure?was?characterized?by?Fourier?transform?infrared?spectroscopy?(FTIR),?hydrogen?nuclear?magnetic?resonance?(1H-NMR)?and?gel?permeation?chromatography?(GPC),?and?the?influences?of?the?grafting?degree?and?side?chain?length?on?the?crystallization?of?side?chains,?melting?behavior?and?glass?transition?temperature?(tg)?were?researched?by?differential?scanning?calorimetry?(DSC).?The?synthesis?method?of?grafted?PVC?adopted?in?this?study?was?an?effective?way?to?graft?long?chain?alkyl?on?the?PVC?bone?and?form?crystallizable?side?chains.?The?melting?enthalpy?and?melting?peak?temperature?increased?with?the?increase?in?grafting?degree,?but?decreased?with?the?increase?in?side?chain?length.?The?tg?declined?first?and?then?rose?with?the?grafting?degree,?and?the?tg?of?the?grafted?PVC?with?longer?side?chains?was?much?higher?than?that?of?PVC?without?side?chains.