We are also the world ' s largest producer of acetyl products , including acetic acid , vinyl acetate monomer ( vam ) and polyacetals ( pom ) and a leading global producer of high - performance engineered polymers used in consumer and industrial products and designed to meet highly technical customer requirements 公司是世界上最大的乙?;a(chǎn)品制造商,產(chǎn)品包括醋酸、醋酸乙烯和聚甲醛,公司在聚合物領(lǐng)域內(nèi)也具有世界領(lǐng)先地位。
With engineering polymer - pmma taken as the main researched object and viscoelastic failure considered as the theory basis , the non - linear viscoelasticity and crazing damage phenomena under creep condition in macromolecule material were researched by means of experiment 本文以工程高聚物pmma為主要研究對象,以粘彈性破壞理論為基礎(chǔ),以實驗為手段,對高分子材料蠕變條件下的非線性粘彈性性能及其銀紋損傷現(xiàn)象進行了初步探討。
We are also one of the world ' s largest producer of acetyl products , including acetic acid , vinyl acetate monomer ( vam ) and polyacetals ( pom ) and a leading global producer of high - performance engineered polymers used in consumer and industrial products and designed to meet highly technical customer requirements 公司是世界上最大的乙酰基產(chǎn)品制造商之一,產(chǎn)品包括醋酸、醋酸乙烯和聚甲醛,公司在聚合物領(lǐng)域內(nèi)也具有世界領(lǐng)先地位。
It is one of mechanisms of plastic distortion , at the same time it is also the beginning of microcosmic damage and rupture before the macroscopical destroying of materials , it representatives a mid - state between materials " macroscopical rupture and bend , it is considered a premonitory that the rupture of polymer material , which get common attention by scholar inside and outside nation . therefore , the research for engineering polymer in mechanic action of non - linearity destroy such as distortion , destroy and depe nd on time and temperature is valuable in theoretic research and actual application , which offer the important theoretic gist for changing complex material ' s capability and actualize polymer ' s perfect application with high quality of capability in engineering 同時,銀紋化和銀紋損傷是高聚物特有的一種現(xiàn)象,細(xì)觀層次的銀紋引發(fā)、生長和斷裂在聚合物損傷斷裂的整個過程中起著承前啟后的作用,它是溝通宏、微觀變形機制的橋梁,是材料塑性變形的機制之一,同時又是材料宏觀破壞以前微觀上損傷、破壞的開始,它代表材料微觀斷裂和屈服之間的一個中間狀態(tài),可以看作是聚合物材料宏觀斷裂的先兆,受到國內(nèi)外學(xué)者們的廣泛關(guān)注。因此,開展工程聚合物變形、破壞以及時間相依和溫度依賴性等非線性力學(xué)行為研究,探討聚合物破壞過程中的非線性力學(xué)行為,為聚合物及其復(fù)合材料的改性、實現(xiàn)聚合物的工程化與高性能化提供重要的理論依據(jù),具有重要的理論研究意義和實際應(yīng)用價值。