合成树脂及塑料
閤成樹脂及塑料
합성수지급소료
CHINA SYNTHETIC RESIN AND PLASTICS
2013年
2期
32-36
,共5页
聚氯乙烯%脲衍生物%热稳定剂%热稳定性能
聚氯乙烯%脲衍生物%熱穩定劑%熱穩定性能
취록을희%뇨연생물%열은정제%열은정성능
poly(vinyl?chloride)%urea?derivatives%heat?stabilizer%heat?stabilization
要:?研究了几种脲衍生物对聚氯乙烯(PVC)热稳定性的影响.脲衍生物均具有类似于硬脂酸锌的热稳定特性,属于初效型主热稳定剂,与硬脂酸钙和环氧大豆油并用存在明显的协同效应;脲衍生物的热稳定性能随羰基上?C?所连接基团拉电子性的增强而提高.根据热稳定性递变规律可以推测,脲衍生物是通过其羰基上?C?作为亲电原子与PVC发生亲电反应而发挥热稳定作用的.这就意味着关于热稳定剂作用机理的传统?Frye?和?Horst?理论至少不适用于脲衍生物,因此,脲衍生物作为热稳定剂的确切作用机理还需进一步研究.
要:?研究瞭幾種脲衍生物對聚氯乙烯(PVC)熱穩定性的影響.脲衍生物均具有類似于硬脂痠鋅的熱穩定特性,屬于初效型主熱穩定劑,與硬脂痠鈣和環氧大豆油併用存在明顯的協同效應;脲衍生物的熱穩定性能隨羰基上?C?所連接基糰拉電子性的增彊而提高.根據熱穩定性遞變規律可以推測,脲衍生物是通過其羰基上?C?作為親電原子與PVC髮生親電反應而髮揮熱穩定作用的.這就意味著關于熱穩定劑作用機理的傳統?Frye?和?Horst?理論至少不適用于脲衍生物,因此,脲衍生物作為熱穩定劑的確切作用機理還需進一步研究.
요:?연구료궤충뇨연생물대취록을희(PVC)열은정성적영향.뇨연생물균구유유사우경지산자적열은정특성,속우초효형주열은정제,여경지산개화배양대두유병용존재명현적협동효응;뇨연생물적열은정성능수탄기상?C?소련접기단랍전자성적증강이제고.근거열은정성체변규률가이추측,뇨연생물시통과기탄기상?C?작위친전원자여PVC발생친전반응이발휘열은정작용적.저취의미착관우열은정제작용궤리적전통?Frye?화?Horst?이론지소불괄용우뇨연생물,인차,뇨연생물작위열은정제적학절작용궤리환수진일보연구.
@@@@The?authors?studied?the?influences?of?several?urea?derivatives?on?the?performance?of?heat?stabilization?of?poly(vinyl?chloride)?(PVC).?The?results?indicate?that?urea?derivatives?are?initial-term?effective?type?primary?heat?stabilizers?showing?thermal?stabilization?characteristics?similar?to?zinc?stearate?and?remarkable?synergistic?effects?with?calcium?stearate?and?epoxidized?soybean?oil.?The?heat?stabilization?performance?of?urea?derivatives?improves?with?the?enhancement?of?electron-withdrawing?ability?of?the?groups?linked?to?the?carbonyl?carbon?atom.?According?to?this?progressive?change?law?of?the?heat?stabilization?performance,?it?can?be?speculated?that?urea?derivatives?stabilize?PVC?by?electrophilic?reaction?with?PVC?using?their?carbonyl?carbon?atoms?as?electrophilic?atoms.?This?means?that?the?traditional?Frye?and?Horst’s?theory?on?mechanism?of?heat?stabilization?of?heat?stabilizers?are?at?least?not?suitable?for?urea?derivatives,?and?therefore,?the?exact?mechanism?of?heat?stabilization?of?heat?stabilizers?needs?to?be?clarified?by?further?research.
