產(chan)品(pin)介紹(shao):

 差示掃描(miao)量(liang)熱儀是(shi)壹(yi)種測量參(can)比(bi)端與樣(yang)品(pin)端的熱流(liu)差與溫(wen)度參數(shu)關系(xi)的(de)熱分(fen)析儀器，主要(yao)應(ying)用(yong)於(yu)測量物質(zhi)加熱或冷(leng)卻過程(cheng)中(zhong)的(de)各種特(te)征參數(shu)：玻璃(li)化轉(zhuan)變(bian)溫(wen)度Tg、氧(yang)化誘導期(qi)OIT、熔(rong)融溫(wen)度、結(jie)晶(jing)溫(wen)度、比(bi)熱容(rong)及(ji)熱焓等。

主要(yao)特點(dian):
1.全新(xin)的(de)爐體(ti)結(jie)構(gou)，確(que)保(bao)解(jie)析度和分(fen)辨率的(de)基(ji)線穩定(ding)性(xing)

2.數(shu)字式氣(qi)體(ti)質(zhi)量流(liu)量計，控(kong)制吹掃氣(qi)體(ti)流(liu)量，數(shu)據(ju)直接(jie)記錄(lu)在數(shu)據(ju)庫中(zhong)
3.儀器可采(cai)用雙(shuang)向(xiang)控(kong)制（主機控(kong)制、軟件(jian)控(kong)制），界(jie)面(mian)友(you)好(hao)，操(cao)作簡(jian)便

技術(shu)參數(shu):

差示掃描(miao)量(liang)熱儀可進行(xing)的測試項目：

典型(xing)的DSC測試曲(qu)線(xian)：

什麽(me)是(shi)玻璃(li)化轉(zhuan)變(bian)溫(wen)度？

玻璃(li)化轉(zhuan)變(bian)是(shi)非(fei)晶(jing)態(tai)高分子材(cai)料（即非(fei)晶(jing)型(xing)聚(ju)合物）固(gu)有的性質(zhi)，是(shi)高分子運動(dong)形式轉(zhuan)變(bian)的(de)宏(hong)觀體(ti)現(xian)，它直接(jie)影響(xiang)到材(cai)料的使用(yong)性能和工(gong)藝性能，因此長期(qi)以(yi)來它(ta)都(dou)是(shi)高分子物理(li)研究的(de)主要(yao)內(nei)容。

絕大多(duo)數(shu)聚(ju)合物材(cai)料通常(chang)可處於以(yi)下(xia)三種物理(li)狀(zhuang)態(tai)(或稱力(li)學(xue)狀(zhuang)態(tai)):玻璃(li)態(tai)、高彈(dan)態（橡(xiang)膠(jiao)態(tai)）和粘(zhan)流(liu)態。而玻璃(li)化轉(zhuan)變(bian)則(ze)是(shi)高彈(dan)態和玻璃(li)態(tai)之(zhi)間(jian)的(de)轉(zhuan)變(bian)，從(cong)分(fen)子結(jie)構(gou)上(shang)講，玻璃(li)化轉(zhuan)變(bian)溫(wen)度是(shi)高聚(ju)物無(wu)定(ding)形部(bu)分從(cong)凍(dong)結(jie)狀(zhuang)態(tai)到解(jie)凍(dong)狀(zhuang)態(tai)的壹(yi)種松弛現(xian)象。

以(yi)DSC為例，當溫(wen)度逐漸升高，通過高分子聚(ju)合物的(de)玻璃(li)化轉(zhuan)變(bian)溫(wen)度時，DSC曲(qu)線(xian)上(shang)的基線向(xiang)吸(xi)熱方(fang)向(xiang)移(yi)動(dong)（見圖(tu)）。圖(tu)中(zhong)A點(dian)是(shi)開始(shi)偏離基線(xian)的點(dian)。將轉(zhuan)變(bian)前(qian)後(hou)的(de)基線延(yan)長，兩線之(zhi)間(jian)的(de)垂(chui)直距離為階差(cha)ΔJ，在ΔJ/2 處可以(yi)找到C點(dian)，從(cong)C點(dian)作(zuo)切(qie)線(xian)與(yu)前(qian)基線相交於(yu)B點(dian)，B點(dian)所(suo)對應(ying)的(de)溫(wen)度值即(ji)為玻璃(li)化轉(zhuan)變(bian)溫(wen)度Tg。

常(chang)見的(de)結(jie)晶(jing)性(xing)塑(su)料有：聚(ju)乙烯PE、聚(ju)丙(bing)烯PP、聚(ju)甲醛(quan)POM、聚(ju)酰胺(an)PA6、聚(ju)酰胺(an)PA66、PET、PBT等(deng)

非(fei)結(jie)晶(jing)塑(su)料有：聚(ju)碳、ABS、透苯(ben)、氯(lv)乙烯等（如塑料表殼(ke)、電視外(wai)殼(ke)等）

什麽(me)是(shi)氧(yang)化誘導期(qi)？

氧(yang)化誘導期(qi)（OIT）是(shi)測定(ding)試(shi)樣(yang)在高溫(wen)（200攝(she)氏(shi)度）氧(yang)氣(qi)條件(jian)下(xia)開始(shi)發生自動(dong)催化氧(yang)化反應(ying)的(de)時(shi)間(jian)，是(shi)評價(jia)材(cai)料在成(cheng)型(xing)加工(gong)、儲(chu)存(cun)、焊接(jie)和使(shi)用中(zhong)耐(nai)熱降解(jie)能力(li)的(de)指(zhi)標。氧(yang)化誘導期(qi)（簡(jian)稱(cheng)OIT）方法是(shi)壹(yi)種采(cai)用差(cha)熱分(fen)析法（DTA）以(yi)塑料分子鏈斷(duan)裂(lie)時的放熱反(fan)應(ying)為依據(ju)，測試塑(su)料在高溫(wen)氧(yang)氣(qi)中(zhong)加(jia)速(su)老(lao)化程(cheng)度的方(fang)法。其(qi)原(yuan)理是(shi)：將塑(su)料試樣與(yu)惰性(xing)參(can)比(bi)物（如(ru)氧(yang)化鋁(lv)）置(zhi)於差(cha)熱分(fen)析儀中(zhong)，使(shi)其(qi)在壹(yi)定(ding)溫(wen)度下(xia)用氧(yang)氣(qi)迅速(su)置(zhi)換(huan)試樣室內(nei)的惰(duo)性氣(qi)體(ti)（如氮氣(qi)）。測試由(you)於(yu)試樣氧(yang)化而引起的(de)DTA曲(qu)線（差(cha)熱譜(pu)）的(de)變(bian)化，並獲(huo)得(de)氧(yang)化誘導期(qi)（時(shi)間(jian)）OIT（min)，以(yi)評定(ding)塑(su)料的防熱老(lao)化性能。

和晟差示掃描(miao)量(liang)熱儀在部(bu)分高校(xiao)研究所(suo)應(ying)用(yong)實(shi)例

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