一般乙酸乙烯(VA)含量在5%~40%。与聚乙烯相比,EVA由于在分子链中引入了乙酸乙烯单体,从而降低了结晶度,提高了柔韧性、抗冲击性、填料相溶性和热密封性能。一般来说,EVA树脂的性能主要取决于分子链上乙酸乙烯的含量。因构成组分比例可调从而符合不同的应用需要,乙酸乙烯(VA content)的含量越高,其透明度,柔软度及坚韧度会相对提高。
聚合方法用高压本体聚合(塑料用)、溶液聚合(PVC加工助剂)、乳液聚合(粘合剂)、悬浮聚合。乙酸乙烯(VA)含量高于30%的采用乳液聚合,乙酸乙烯含量低的就用高压本体聚合。
乙烯与醋酸乙烯共聚物是乙烯共聚物中重要的产品,国外一般将其统称为EVA。但是在我国,人们根据其中醋酸乙烯含量的不同,将乙烯与醋酸乙烯共聚物分为EVA树脂、EVA橡胶和EVA乳液。醋酸乙烯含量小于40%的产品为EVA树脂;醋酸乙烯含量40%~70%的产品很柔韧;富有弹性特征,人们将这一含量范围的EVA树脂有时称为EVA橡胶;醋酸乙烯含量在70%~95%范围内通常呈乳液状态,称为EVA乳液。EVA乳液外观呈乳白色或微黄色。
EvA yana da kofolocin etylen aviyl acetat, wanda aka yi wa tattalin koptolymerization na etylen (ET) da Winyl acetat (V A). Sunan Ingirinsa na etylen Winyl Acetate, wanda aka buɗe kamar EvA, ko EvA. A jumla, kayan gaske na binylacetat (V A) na tsawo daga 5% zuwa 40%. Ana sami da Poletylen, EV yana ƙara crallini, yana ƙara fleksibinci, mai nuna motsi, mai cikawa da solarin shekara, da danna muhalli na dabam-dabam, saboda an ƙara wata monomer na winyl acetat a cikin birnin kullum. Jama'a da ake faɗa, aikin EvA na ƙarfafa mainli, yana dõgara cikin maɓallin cetate na Winyl a kan jerũruwa na kullum. Du da rabon da ake daidaita dõmin su cika mazaunin ayuka daban-daban, za'a ƙara maɓallin acetat na Winyl (maɓallin V A), ana ƙara tsakaninsa, tsammaci, kuma mai nau'i.
Shiryoyin Polymerization sun include, umarnin damƙari mai yawa (wa plastika), malimalisar masu amfani da masu amfani da shiryoyin ayuka na PvC, surori na lokacin (da ake yi wa hisani) da kuma ana daɗe mulma'arinsa. Ana zãɓi lokalori wa waɗanda ke da maɓallin cetat (V A) na ƙaranci 30%, kuma an zãɓi diffuse ya yi diffuse ga waɗanda ke da maɓallin ƙaranci na V A.
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Ana gaya ceylen da kofolomita na Winyl acetat masu muhimu ne a cikin kofolomi na etylen, a kawai da aka ƙayyade EV A cikin mataifan nan da ba'a sani ba. Amma a cikin China, mutane suna raba ceylen da koptolymer na Winyl acetat zuwa raƙarin EvA, rubutun EV da EvA da gwargwadon da ke cikin wasu maɓallin marubuta na Winylacetat. Ana nuna da wani ƙuncin acetat na Winyl da ke ƙara 40% na EV na fara; Ana sami da wani cetat na Winyl ya ƙunsa da asilimitan 40 zuwa 70%, yana da amfani mai girma; Ana ƙayyade rubutun EV a cikin wannan zane-ƙunsa; Content of Winyl acetate in tsakanin 70% min95% na ɗabi'a, yana cikin shawarar lokacin da ake kiran EV. Tashin EV mai baƙi ne mai fari ko kuwa baƙi.