JP2006036923A - ブロック共重合体−クレイナノコンポジットの高配向膜およびその製造方法 - Google Patents
ブロック共重合体−クレイナノコンポジットの高配向膜およびその製造方法 Download PDFInfo
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Abstract
【解決手段】
ラメラ構造を有するポリ(エチレンオキシド−スチレン)ブロック共重合体(PEO-b-PS)−クレイナノコンポジットからなり、
1.Mw/Mn= 1.1以下、 PEO/PS = 65/35〜35/65(重量比)でラメラ構造を形成し、
2.ブロック共重合体のラメラがフィルム面に高度に配向し、
3.ラメラ構造の中でPEOの結晶が高度に配向し、
4.クレイの重量分率:2〜20%
5.クレイの層間にブロック共重合体がインターカレートしていることを特徴とする高配向フィルム及びその製造方法。
【採用図面】 図1
Description
ラメラ構造を有するポリ(エチレンオキシド−スチレン)ブロック共重合体(PEO-b-PS)−クレイナノコンポジットからなり、
1.Mw/Mn= 1.1以下、 PEO/PS = 65/35〜35/65(重量比)でラメラ構造を形成し、
2.ブロック共重合体のラメラがフィルム面に高度に配向し、
3.ラメラ構造の中でPEOの結晶が高度に配向し、
4.クレイの重量分率:2〜20%
5.クレイの層間にブロック共重合体がインターカレートしていることを特徴とする高配向フィルムとする。
また、本発明の高配向フィルムは、ブロック共重合体のラメラとクレイの層がフィルム面に平行に配向し、かつ、ブロック共重合体の両成分にクレイを存在させることができる。
さらに、本発明は、Mw/Mn = 1.1以下、 PEO/PS =
65/35〜35/65(重量比)でラメラ構造を有する分子量(Mn)30,000以上のポリ(エチレンオキシド−スチレン)ブロック共重合体を作成し、ブロック共重合体とクレイを溶液中で均一分散し、溶媒を徐々に蒸発することによりキャスト膜を作製し、さらに、フィルムを真空下、高温で長時間熱処理することを特徴とするPEO-b-PS−クレイナノコンポジットフィルムの製造方法でもある。
クレイとブロック共重合体を配列制御する温度は、160〜200℃であり、時間は10時間以上必要である。
ガスバリア膜などの機能性プラスチックフィルムとして広範な用途に応用可能である。
1.Mw/Mn= 1.1以下、 PEO/PS = 65/35〜35/65(重量比)でラメラ構造を形成し、
2.ブロック共重合体のラメラがフィルム面に高度に配向し、かつ、
3.ラメラ構造の中でPEOの結晶が高度に配向したことを特徴とする。
また、本発明で用いるクレイは、代表的には有機化クレーであるが、これは、クレーをアルキルアンモニウム塩と反応させて得たものであり、好ましく用いることが出来る。
本発明は、ブロック共重合体とクレイを溶液中で均一分散し、溶媒を徐々に蒸発することによりキャスト膜を作製するが、ここで用いる溶媒としては、トルエン、キシレン等の芳香族炭化水素、テトラヒドロフラン、クロロホルムなどが挙げられる。
(実施例1)
(PEO-b-PS)−クレイナノコンポジットの製造)
PEO-b-PS (PEOの数平均分子量:71,000 PSの数平均分子量:58,600、Mw/Mn = 1.04)と有機化クレーを60℃、5%トルエン溶液中で、48時間攪拌することにより、透明な溶液を作製した。溶液をテフロン(登録商標)シート上にキャストし、室温で徐々に溶媒を蒸発させた後、さらにフィルムを加圧下、180℃で、18時間熱処理した。
広角X線回折(WAXD)、小角X線散乱(SAXS)、透過型電子顕微鏡(TEM)などにより試料の構造を解析した。
広角X線回折(WAXD)、小角X線散乱(SAXS)、透過型電子顕微鏡(TEM)などにより試料の構造を解析した。SAXSとTEMによるとクレーを含まないブロック共重合体は、60nm周期のラメラ構造(PEO層とPS層の厚さ、それぞれ31nmと29nm)を形成している。PEO-b-PS/クレーナノコンポジットのSAXSパターンは、PEO-b-PSのSAXSパターンとほぼ同様で、ナノコンポジットにおいてもラメラ構造が保たれ、かつラメラがフィルム面に平行に配向していることが示された。シリケート層の配向を調べるために、反射法と透過法によりWAXDプロフィールを測定し図1に示した。
反射法で測定したプロフィールには、00l反射が観測されているが、透過法では観測されていない。この結果は、シリケート層が、ブロック共重合体のラメラ構造と同じく、フィルム面に平行に配向していることを示している。また、有機化クレー自身は、2q=4.0°に鋭い反射を示すが、PEO-b-PS/クレーナノコンポジットでは、対応する反射が
2q=1.85°へシフトし、ブロック共重合体がクレーの層間にインターカレートされていることを示している。
以上のように、ブロック共重合体がクレーの層間に挿入し、ブロック共重合体のラメラ構造とシリケート層がいずれもフィルム面に平行に配向していることが明らかになった。
Claims (3)
- ラメラ構造を有するポリ(エチレンオキシド−スチレン)ブロック共重合体(PEO-b-PS)−クレイナノコンポジットからなり、
1.Mw/Mn= 1.1以下、 PEO/PS = 65/35〜35/65(重量比)でラメラ構造を形成し、
2.ブロック共重合体のラメラがフィルム面に高度に配向し、
3.ラメラ構造の中でPEOの結晶が高度に配向し、
4.クレイの重量分率:2〜20%
5.クレイの層間にブロック共重合体がインターカレートしていることを特徴とする高配向フィルム。 - ブロック共重合体のラメラとクレイの層がフィルム面に平行に配向し、かつ、ブロック共重合体の両成分にクレイが存在することを特徴とする請求項1に記載した高配向フィルム。
- Mw/Mn = 1.1以下、 PEO/PS = 65/35〜35/65(重量比)でラメラ構造を有する分子量(Mn)30,000以上のポリ(エチレンオキシド−スチレン)ブロック共重合体を作成し、ブロック共重合体とクレイを溶液中で均一分散し、溶媒を徐々に蒸発することによりキャスト膜を作製し、さらに、フィルムを真空下、高温で長時間熱処理することを特徴とするPEO-b-PS−クレイナノコンポジットフィルムの製造方法。
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