合成树脂及塑料
閤成樹脂及塑料
합성수지급소료
CHINA SYNTHETIC RESIN AND PLASTICS
2015年
1期
1-5
,共5页
无规共聚聚丙烯%N,N′-二环己基对苯二甲酰胺%β成核剂
無規共聚聚丙烯%N,N′-二環己基對苯二甲酰胺%β成覈劑
무규공취취병희%N,N′-이배기기대분이갑선알%β성핵제
polypropylene random copolymer%N,N′-dicyclohesyl terephthalamide%β-nucleating agent
使用差示扫描量热仪、广角X射线衍射仪和偏光显微镜研究了不同挤出工艺条件下N,N′-二环己基对苯二甲酰胺(DCHT)对无规共聚聚丙烯(PPR)β成核效果的影响。结果表明:加入质量分数0.15%的DCHT会诱导PPR中部分α晶转变成β晶,使原来粗大的球晶转变成“花心”状晶,出现β晶(300)晶面的特征衍射峰;提高单螺杆挤出机螺筒温度或螺杆转速都会明显增强DCHT对PPR的β成核效果;使用双螺杆挤出机在螺杆转速较高时,挤出改性PPR的β晶相对含量较高;最优工艺条件为单螺杆挤出机料筒温度250℃、螺杆转速120r/min,或双螺杆挤出机料筒温度230℃、螺杆转速170r/min,此时改性PPR的β晶相对含量达45.0%以上,DCHT对PPR有较好的β成核作用。
使用差示掃描量熱儀、廣角X射線衍射儀和偏光顯微鏡研究瞭不同擠齣工藝條件下N,N′-二環己基對苯二甲酰胺(DCHT)對無規共聚聚丙烯(PPR)β成覈效果的影響。結果錶明:加入質量分數0.15%的DCHT會誘導PPR中部分α晶轉變成β晶,使原來粗大的毬晶轉變成“花心”狀晶,齣現β晶(300)晶麵的特徵衍射峰;提高單螺桿擠齣機螺筒溫度或螺桿轉速都會明顯增彊DCHT對PPR的β成覈效果;使用雙螺桿擠齣機在螺桿轉速較高時,擠齣改性PPR的β晶相對含量較高;最優工藝條件為單螺桿擠齣機料筒溫度250℃、螺桿轉速120r/min,或雙螺桿擠齣機料筒溫度230℃、螺桿轉速170r/min,此時改性PPR的β晶相對含量達45.0%以上,DCHT對PPR有較好的β成覈作用。
사용차시소묘량열의、엄각X사선연사의화편광현미경연구료불동제출공예조건하N,N′-이배기기대분이갑선알(DCHT)대무규공취취병희(PPR)β성핵효과적영향。결과표명:가입질량분수0.15%적DCHT회유도PPR중부분α정전변성β정,사원래조대적구정전변성“화심”상정,출현β정(300)정면적특정연사봉;제고단라간제출궤라통온도혹라간전속도회명현증강DCHT대PPR적β성핵효과;사용쌍라간제출궤재라간전속교고시,제출개성PPR적β정상대함량교고;최우공예조건위단라간제출궤료통온도250℃、라간전속120r/min,혹쌍라간제출궤료통온도230℃、라간전속170r/min,차시개성PPR적β정상대함량체45.0%이상,DCHT대PPR유교호적β성핵작용。
β-nucleation?effect?of?N,N′-dicyclohesyl?terephthalamide(DCHT)?on?polypropylene?random?copolymer(PPR)?in?different?extrusion?processing?conditions?was?studied?with?differential?scanning?calorimetry?(DSC),?wide?angle?X-ray?diffraction(WAXD)?and?polarizing?light?microscope(PLM).?The?results?show?that?DCHT?can?induce?partial?α?crystal?in?PPR?convert?into?β?crystal,?and?make?original?bulky?spherulite?change?into?flower-like?crystal?morphology?when?0.15%?by?mass?of?DCHT?is?added?into?PPR,?and?consequently?characterization?diffraction?peak?of?crystal?face?300?of?β?crystal?appears.?DCHT?enhances?β-nucleation?of?PPR?obviously?when?the?barrel?temperature?or?the?screw?speed?of?the?single-screw?extruder?increases.?The?modified?PPR?has?high?β?crystal?relative?content?when?the?twin-screw?extruder?with?high?screw?speed?is?used.?The?β?crystal?relative?content?of?the?modified?PPR?is?over?45.0%,?which?means?DCHT?has?good?nucleation?effect?on?PPR,?under?the?optimal?extrusion?conditions?including?the?barrel?temperature?of?250?℃?and?the?screw?speed?of?120?r/min?for?the?single-screw?extruder,?or?the?barrel?temperature?of?230?℃?and?the?screw?speed?of?170?r/min?for?the?twin-screw?extruder.